464 lines
13 KiB
Plaintext
464 lines
13 KiB
Plaintext
Device Tree Clock bindings for arch-at91
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This binding uses the common clock binding[1].
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[1] Documentation/devicetree/bindings/clock/clock-bindings.txt
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Required properties:
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- compatible : shall be one of the following:
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"atmel,at91sam9x5-sckc":
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at91 SCKC (Slow Clock Controller)
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This node contains the slow clock definitions.
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"atmel,at91sam9x5-clk-slow-osc":
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at91 slow oscillator
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"atmel,at91sam9x5-clk-slow-rc-osc":
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at91 internal slow RC oscillator
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"atmel,at91rm9200-pmc" or
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"atmel,at91sam9g45-pmc" or
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"atmel,at91sam9n12-pmc" or
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"atmel,at91sam9x5-pmc" or
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"atmel,sama5d3-pmc":
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at91 PMC (Power Management Controller)
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All at91 specific clocks (clocks defined below) must be child
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node of the PMC node.
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"atmel,at91sam9x5-clk-slow" (under sckc node)
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or
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"atmel,at91sam9260-clk-slow" (under pmc node):
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at91 slow clk
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"atmel,at91rm9200-clk-main-osc"
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"atmel,at91sam9x5-clk-main-rc-osc"
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at91 main clk sources
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"atmel,at91sam9x5-clk-main"
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"atmel,at91rm9200-clk-main":
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at91 main clock
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"atmel,at91rm9200-clk-master" or
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"atmel,at91sam9x5-clk-master":
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at91 master clock
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"atmel,at91sam9x5-clk-peripheral" or
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"atmel,at91rm9200-clk-peripheral":
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at91 peripheral clocks
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"atmel,at91rm9200-clk-pll" or
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"atmel,at91sam9g45-clk-pll" or
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"atmel,at91sam9g20-clk-pllb" or
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"atmel,sama5d3-clk-pll":
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at91 pll clocks
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"atmel,at91sam9x5-clk-plldiv":
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at91 plla divisor
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"atmel,at91rm9200-clk-programmable" or
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"atmel,at91sam9g45-clk-programmable" or
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"atmel,at91sam9x5-clk-programmable":
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at91 programmable clocks
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"atmel,at91sam9x5-clk-smd":
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at91 SMD (Soft Modem) clock
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"atmel,at91rm9200-clk-system":
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at91 system clocks
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"atmel,at91rm9200-clk-usb" or
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"atmel,at91sam9x5-clk-usb" or
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"atmel,at91sam9n12-clk-usb":
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at91 usb clock
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"atmel,at91sam9x5-clk-utmi":
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at91 utmi clock
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"atmel,sama5d4-clk-h32mx":
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at91 h32mx clock
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Required properties for SCKC node:
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- reg : defines the IO memory reserved for the SCKC.
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- #size-cells : shall be 0 (reg is used to encode clk id).
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- #address-cells : shall be 1 (reg is used to encode clk id).
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For example:
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sckc: sckc@fffffe50 {
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compatible = "atmel,sama5d3-pmc";
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reg = <0xfffffe50 0x4>
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#size-cells = <0>;
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#address-cells = <1>;
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/* put at91 slow clocks here */
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};
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Required properties for internal slow RC oscillator:
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- #clock-cells : from common clock binding; shall be set to 0.
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- clock-frequency : define the internal RC oscillator frequency.
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Optional properties:
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- clock-accuracy : define the internal RC oscillator accuracy.
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For example:
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slow_rc_osc: slow_rc_osc {
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compatible = "atmel,at91sam9x5-clk-slow-rc-osc";
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clock-frequency = <32768>;
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clock-accuracy = <50000000>;
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};
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Required properties for slow oscillator:
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- #clock-cells : from common clock binding; shall be set to 0.
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- clocks : shall encode the main osc source clk sources (see atmel datasheet).
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Optional properties:
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- atmel,osc-bypass : boolean property. Set this when a clock signal is directly
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provided on XIN.
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For example:
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slow_osc: slow_osc {
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compatible = "atmel,at91rm9200-clk-slow-osc";
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#clock-cells = <0>;
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clocks = <&slow_xtal>;
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};
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Required properties for slow clock:
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- #clock-cells : from common clock binding; shall be set to 0.
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- clocks : shall encode the slow clk sources (see atmel datasheet).
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For example:
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clk32k: slck {
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compatible = "atmel,at91sam9x5-clk-slow";
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#clock-cells = <0>;
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clocks = <&slow_rc_osc &slow_osc>;
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};
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Required properties for PMC node:
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- reg : defines the IO memory reserved for the PMC.
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- #size-cells : shall be 0 (reg is used to encode clk id).
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- #address-cells : shall be 1 (reg is used to encode clk id).
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- interrupts : shall be set to PMC interrupt line.
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- interrupt-controller : tell that the PMC is an interrupt controller.
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- #interrupt-cells : must be set to 1. The first cell encodes the interrupt id,
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and reflect the bit position in the PMC_ER/DR/SR registers.
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You can use the dt macros defined in dt-bindings/clock/at91.h.
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0 (AT91_PMC_MOSCS) -> main oscillator ready
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1 (AT91_PMC_LOCKA) -> PLL A ready
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2 (AT91_PMC_LOCKB) -> PLL B ready
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3 (AT91_PMC_MCKRDY) -> master clock ready
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6 (AT91_PMC_LOCKU) -> UTMI PLL clock ready
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8 .. 15 (AT91_PMC_PCKRDY(id)) -> programmable clock ready
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16 (AT91_PMC_MOSCSELS) -> main oscillator selected
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17 (AT91_PMC_MOSCRCS) -> RC main oscillator stabilized
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18 (AT91_PMC_CFDEV) -> clock failure detected
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For example:
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pmc: pmc@fffffc00 {
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compatible = "atmel,sama5d3-pmc";
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interrupts = <1 4 7>;
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interrupt-controller;
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#interrupt-cells = <2>;
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#size-cells = <0>;
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#address-cells = <1>;
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/* put at91 clocks here */
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};
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Required properties for main clock internal RC oscillator:
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- interrupt-parent : must reference the PMC node.
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- interrupts : shall be set to "<0>".
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- clock-frequency : define the internal RC oscillator frequency.
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Optional properties:
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- clock-accuracy : define the internal RC oscillator accuracy.
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For example:
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main_rc_osc: main_rc_osc {
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compatible = "atmel,at91sam9x5-clk-main-rc-osc";
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interrupt-parent = <&pmc>;
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interrupts = <0>;
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clock-frequency = <12000000>;
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clock-accuracy = <50000000>;
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};
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Required properties for main clock oscillator:
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- interrupt-parent : must reference the PMC node.
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- interrupts : shall be set to "<0>".
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- #clock-cells : from common clock binding; shall be set to 0.
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- clocks : shall encode the main osc source clk sources (see atmel datasheet).
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Optional properties:
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- atmel,osc-bypass : boolean property. Specified if a clock signal is provided
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on XIN.
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clock signal is directly provided on XIN pin.
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For example:
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main_osc: main_osc {
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compatible = "atmel,at91rm9200-clk-main-osc";
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interrupt-parent = <&pmc>;
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interrupts = <0>;
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#clock-cells = <0>;
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clocks = <&main_xtal>;
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};
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Required properties for main clock:
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- interrupt-parent : must reference the PMC node.
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- interrupts : shall be set to "<0>".
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- #clock-cells : from common clock binding; shall be set to 0.
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- clocks : shall encode the main clk sources (see atmel datasheet).
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For example:
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main: mainck {
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compatible = "atmel,at91sam9x5-clk-main";
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interrupt-parent = <&pmc>;
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interrupts = <0>;
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#clock-cells = <0>;
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clocks = <&main_rc_osc &main_osc>;
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};
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Required properties for master clock:
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- interrupt-parent : must reference the PMC node.
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- interrupts : shall be set to "<3>".
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- #clock-cells : from common clock binding; shall be set to 0.
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- clocks : shall be the master clock sources (see atmel datasheet) phandles.
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e.g. "<&ck32k>, <&main>, <&plla>, <&pllb>".
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- atmel,clk-output-range : minimum and maximum clock frequency (two u32
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fields).
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e.g. output = <0 133000000>; <=> 0 to 133MHz.
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- atmel,clk-divisors : master clock divisors table (four u32 fields).
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0 <=> reserved value.
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e.g. divisors = <1 2 4 6>;
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- atmel,master-clk-have-div3-pres : some SoC use the reserved value 7 in the
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PRES field as CLOCK_DIV3 (e.g sam9x5).
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For example:
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mck: mck {
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compatible = "atmel,at91rm9200-clk-master";
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interrupt-parent = <&pmc>;
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interrupts = <3>;
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#clock-cells = <0>;
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atmel,clk-output-range = <0 133000000>;
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atmel,clk-divisors = <1 2 4 0>;
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};
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Required properties for peripheral clocks:
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- #size-cells : shall be 0 (reg is used to encode clk id).
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- #address-cells : shall be 1 (reg is used to encode clk id).
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- clocks : shall be the master clock phandle.
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e.g. clocks = <&mck>;
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- name: device tree node describing a specific system clock.
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* #clock-cells : from common clock binding; shall be set to 0.
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* reg: peripheral id. See Atmel's datasheets to get a full
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list of peripheral ids.
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* atmel,clk-output-range : minimum and maximum clock frequency
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(two u32 fields). Only valid on at91sam9x5-clk-peripheral
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compatible IPs.
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For example:
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periph: periphck {
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compatible = "atmel,at91sam9x5-clk-peripheral";
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#size-cells = <0>;
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#address-cells = <1>;
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clocks = <&mck>;
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ssc0_clk {
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#clock-cells = <0>;
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reg = <2>;
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atmel,clk-output-range = <0 133000000>;
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};
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usart0_clk {
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#clock-cells = <0>;
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reg = <3>;
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atmel,clk-output-range = <0 66000000>;
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};
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};
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Required properties for pll clocks:
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- interrupt-parent : must reference the PMC node.
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- interrupts : shall be set to "<1>".
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- #clock-cells : from common clock binding; shall be set to 0.
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- clocks : shall be the main clock phandle.
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- reg : pll id.
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0 -> PLL A
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1 -> PLL B
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- atmel,clk-input-range : minimum and maximum source clock frequency (two u32
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fields).
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e.g. input = <1 32000000>; <=> 1 to 32MHz.
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- #atmel,pll-clk-output-range-cells : number of cells reserved for pll output
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range description. Sould be set to 2, 3
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or 4.
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* 1st and 2nd cells represent the frequency range (min-max).
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* 3rd cell is optional and represents the OUT field value for the given
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range.
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* 4th cell is optional and represents the ICPLL field (PLLICPR
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register)
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- atmel,pll-clk-output-ranges : pll output frequency ranges + optional parameter
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depending on #atmel,pll-output-range-cells
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property value.
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For example:
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plla: pllack {
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compatible = "atmel,at91sam9g45-clk-pll";
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interrupt-parent = <&pmc>;
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interrupts = <1>;
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#clock-cells = <0>;
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clocks = <&main>;
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reg = <0>;
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atmel,clk-input-range = <2000000 32000000>;
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#atmel,pll-clk-output-range-cells = <4>;
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atmel,pll-clk-output-ranges = <74500000 800000000 0 0
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69500000 750000000 1 0
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64500000 700000000 2 0
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59500000 650000000 3 0
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54500000 600000000 0 1
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49500000 550000000 1 1
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44500000 500000000 2 1
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40000000 450000000 3 1>;
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};
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Required properties for plldiv clocks (plldiv = pll / 2):
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- #clock-cells : from common clock binding; shall be set to 0.
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- clocks : shall be the plla clock phandle.
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The pll divisor is equal to 2 and cannot be changed.
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For example:
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plladiv: plladivck {
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compatible = "atmel,at91sam9x5-clk-plldiv";
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#clock-cells = <0>;
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clocks = <&plla>;
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};
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Required properties for programmable clocks:
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- interrupt-parent : must reference the PMC node.
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- #size-cells : shall be 0 (reg is used to encode clk id).
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- #address-cells : shall be 1 (reg is used to encode clk id).
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- clocks : shall be the programmable clock source phandles.
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e.g. clocks = <&clk32k>, <&main>, <&plla>, <&pllb>;
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- name: device tree node describing a specific prog clock.
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* #clock-cells : from common clock binding; shall be set to 0.
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* reg : programmable clock id (register offset from PCKx
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register).
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* interrupts : shall be set to "<(8 + id)>".
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For example:
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prog: progck {
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compatible = "atmel,at91sam9g45-clk-programmable";
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#size-cells = <0>;
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#address-cells = <1>;
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interrupt-parent = <&pmc>;
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clocks = <&clk32k>, <&main>, <&plladiv>, <&utmi>, <&mck>;
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prog0 {
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#clock-cells = <0>;
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reg = <0>;
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interrupts = <8>;
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};
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prog1 {
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#clock-cells = <0>;
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reg = <1>;
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interrupts = <9>;
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};
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};
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Required properties for smd clock:
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- #clock-cells : from common clock binding; shall be set to 0.
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- clocks : shall be the smd clock source phandles.
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e.g. clocks = <&plladiv>, <&utmi>;
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For example:
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smd: smdck {
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compatible = "atmel,at91sam9x5-clk-smd";
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#clock-cells = <0>;
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clocks = <&plladiv>, <&utmi>;
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};
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Required properties for system clocks:
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- #size-cells : shall be 0 (reg is used to encode clk id).
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- #address-cells : shall be 1 (reg is used to encode clk id).
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- name: device tree node describing a specific system clock.
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* #clock-cells : from common clock binding; shall be set to 0.
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* reg: system clock id (bit position in SCER/SCDR/SCSR registers).
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See Atmel's datasheet to get a full list of system clock ids.
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For example:
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system: systemck {
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compatible = "atmel,at91rm9200-clk-system";
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#address-cells = <1>;
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#size-cells = <0>;
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ddrck {
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#clock-cells = <0>;
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reg = <2>;
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clocks = <&mck>;
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};
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uhpck {
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#clock-cells = <0>;
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reg = <6>;
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clocks = <&usb>;
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};
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udpck {
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#clock-cells = <0>;
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reg = <7>;
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clocks = <&usb>;
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};
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};
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Required properties for usb clock:
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- #clock-cells : from common clock binding; shall be set to 0.
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- clocks : shall be the smd clock source phandles.
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e.g. clocks = <&pllb>;
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- atmel,clk-divisors (only available for "atmel,at91rm9200-clk-usb"):
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usb clock divisor table.
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e.g. divisors = <1 2 4 0>;
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For example:
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usb: usbck {
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compatible = "atmel,at91sam9x5-clk-usb";
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#clock-cells = <0>;
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clocks = <&plladiv>, <&utmi>;
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};
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usb: usbck {
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compatible = "atmel,at91rm9200-clk-usb";
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#clock-cells = <0>;
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clocks = <&pllb>;
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atmel,clk-divisors = <1 2 4 0>;
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};
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Required properties for utmi clock:
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- interrupt-parent : must reference the PMC node.
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- interrupts : shall be set to "<AT91_PMC_LOCKU IRQ_TYPE_LEVEL_HIGH>".
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- #clock-cells : from common clock binding; shall be set to 0.
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- clocks : shall be the main clock source phandle.
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For example:
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utmi: utmick {
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compatible = "atmel,at91sam9x5-clk-utmi";
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interrupt-parent = <&pmc>;
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interrupts = <AT91_PMC_LOCKU IRQ_TYPE_LEVEL_HIGH>;
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#clock-cells = <0>;
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clocks = <&main>;
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};
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Required properties for 32 bits bus Matrix clock (h32mx clock):
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- #clock-cells : from common clock binding; shall be set to 0.
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- clocks : shall be the master clock source phandle.
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For example:
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h32ck: h32mxck {
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#clock-cells = <0>;
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compatible = "atmel,sama5d4-clk-h32mx";
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clocks = <&mck>;
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};
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