96 lines
3.2 KiB
Plaintext
96 lines
3.2 KiB
Plaintext
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TSPP Driver
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For information on the TSPP driver, please refer to the TSPP driver
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documentation: Documentation/arm/msm/tspp.txt.
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The devicetree representation of the TSPP block should be:
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Required properties:
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- compatible: "qcom,msm_tspp"
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- cell-index: <0> - represents device ID.
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- reg: physical memory base addresses and sizes for the following:
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TSIF0, TSIF1, TSPP and TSPP_BAM.
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- reg-names: names of the memory regions.
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- interrupts: represents IRQ numbers for the following:
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TSIF_TSPP_IRQ, TSIF0_IRQ, TSIF1_IRQ, TSIF_BAM_IRQ.
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- interrupt-names: TSPP, TSIF and BAM interrupt names.
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- qcom,tsif-pclk: interface clock name.
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- qcom,tsif-ref-clk: reference clock name.
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The driver uses clk_get to get the clocks by name. The clocks
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should be defined in the relevant clock file (e.g. clock-8974.c).
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- gpios: GPIO numbers for TSIF0 (CLK, EN, DATA and SYNC) and TSIF1 (same).
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- qcom,gpio-names: GPIO names - strings describing the GPIO functionality.
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- qcom,gpios-func: GPIO functionality according to the GPIO functionality table.
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GPIO pins can have more than a single functionality, and the TSPP driver
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is responsible for configuring the GPIOs to work in TSIF functionality
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based on this parameter.
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Note: it is assumed that the functionality value (e.g. 1 in 8974 case)
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is applicable to all TSIF GPIOs.
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Optional properties:
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- vdd_cx-supply: Reference to the regulator that supplies the CX rail.
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Some hardware platforms (e.g. 8974-v2) require the voltage of the rail
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supplying power to the TSIF hardware block to be elevated before
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enabling the TSIF clocks.
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- Refer to "Documentation/devicetree/bindings/arm/msm/msm_bus.txt" for
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the below optional properties:
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- qcom,msm-bus,name
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- qcom,msm-bus,num-cases
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- qcom,msm-bus,active-only
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- qcom,msm-bus,num-paths
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- qcom,msm-bus,vectors-KBps
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Example (for 8974 platform, avaialble at msm8974.dtsi):
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tspp: msm_tspp@f99d8000 {
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compatible = "qcom,msm_tspp";
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cell-index = <0>;
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reg = <0xf99d8000 0x1000>, /* MSM_TSIF0_PHYS */
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<0xf99d9000 0x1000>, /* MSM_TSIF1_PHYS */
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<0xf99da000 0x1000>, /* MSM_TSPP_PHYS */
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<0xf99c4000 0x14000>; /* MSM_TSPP_BAM_PHYS */
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reg-names = "MSM_TSIF0_PHYS",
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"MSM_TSIF1_PHYS",
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"MSM_TSPP_PHYS",
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"MSM_TSPP_BAM_PHYS";
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interrupts = <0 153 0>, /* TSIF_TSPP_IRQ */
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<0 151 0>, /* TSIF0_IRQ */
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<0 152 0>, /* TSIF1_IRQ */
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<0 154 0>; /* TSIF_BAM_IRQ */
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interrupt-names = "TSIF_TSPP_IRQ",
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"TSIF0_IRQ",
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"TSIF1_IRQ",
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"TSIF_BAM_IRQ";
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qcom,tsif-pclk = "iface_clk";
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qcom,tsif-ref-clk = "ref_clk";
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gpios = <&msmgpio 89 0>, /* TSIF0 CLK */
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<&msmgpio 90 0>, /* TSIF0 EN */
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<&msmgpio 91 0>, /* TSIF0 DATA */
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<&msmgpio 92 0>, /* TSIF0 SYNC */
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<&msmgpio 93 0>, /* TSIF1 CLK */
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<&msmgpio 94 0>, /* TSIF1 EN */
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<&msmgpio 95 0>, /* TSIF1 DATA */
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<&msmgpio 96 0>; /* TSIF1 SYNC */
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qcom,gpio-names = "tsif_clk",
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"tsif_en",
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"tsif_data",
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"tsif_sync",
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"tsif_clk",
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"tsif_en",
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"tsif_data",
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"tsif_sync";
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qcom,gpios-func = <1>;
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qcom,msm-bus,name = "tsif";
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qcom,msm-bus,num-cases = <2>;
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qcom,msm-bus,active-only = <0>;
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qcom,msm-bus,num-paths = <1>;
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qcom,msm-bus,vectors-KBps =
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<82 512 0 0>, /* No vote */
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<82 512 12288 24576>; /* Max. bandwidth, 2xTSIF, each max of 96Mbps */
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};
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