92 lines
4.0 KiB
Plaintext
92 lines
4.0 KiB
Plaintext
Qualcomm QPNP BSI - battery serial interface devices
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qpnp-bsi is a BIF driver which supports the BSI peripheral inside of PMICs
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that utilize the MSM SPMI implementation.
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Required properties:
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- compatible: Must be "qcom,qpnp-bsi".
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- reg: Specifies the SPMI address and size for this BSI device as
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well as the address of the BATT_ID status register.
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- reg-names: A list of strings identifying the reg property entries. The
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list must contain both "bsi-base" and "batt-id-status".
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- label: A string used as a descriptive name for this BIF controller.
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- interrupts: Specifies a list of four interrupts corresponding to
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IRQ ERR, IRQ RX, IRQ TX, and IRQ BATT_PRESENT in any order.
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- interrupt-names: Must be a list of strings containing all three of these
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strings: "err", "rx", "tx", "batt-present". The ordering of
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these strings must match the ordering of the interrupts in
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the "interrupts" property.
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Required structure:
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- A qcom,qpnp-bsi node must be a child of an SPMI node that has specified the
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spmi-slave-container property.
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Optional properties:
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- qcom,min-clock-period: This property specifies a minimum clock period for the
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Tau BIF reference in nanoseconds. It can be used to
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impose a minimum period which is higher (i.e. more
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restrictive) than that supported by the hardware.
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The BSI module supports 8 possible periods between
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2080 ns and 150420 ns.
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- qcom,max-clock-period: This property specifies a maximum clock period for the
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Tau BIF reference in nanoseconds. It can be used to
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impose a maximum period which is lower (i.e. more
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restrictive) than that supported by the hardware.
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The BSI module supports 8 possible periods between
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2080 ns and 150420 ns.
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- qcom,sample-rate: Specifies the rate at which the BIF BCL should be
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sampled during communication with respect to the Tau
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BIF reference rate. Supported values are 4 and 8
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which represent 4x and 8x sampling rates
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respectively. If this property is not specified,
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then 4x sampling is assumed.
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- qcom,channel-num: VADC channel number associated PMIC BATT_ID pin. If
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no channel is specified, then it will not be
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possible to measure the slave Rid.
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- qcom,pullup-ohms: Host side pull-up resistance present on BCL in ohms.
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If no value is specified, then 100000 ohms is
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assumed.
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- qcom,vref-microvolts: Reference voltage used for BCL divider circuit in
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microvolts. If no value is specified, then
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1800000 uV is assumed.
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All properties specified within for the BIF framework can also be used. These
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properties can be found in bif.txt.
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Example:
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qcom,spmi@fc4c0000 {
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#address-cells = <1>;
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#size-cells = <0>;
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interrupt-controller;
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#interrupt-cells = <3>;
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qcom,pm8941@1 {
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spmi-slave-container;
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reg = <0x1>;
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#address-cells = <1>;
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#size-cells = <1>;
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qcom,bsi@1b00 {
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compatible = "qcom,qpnp-bsi";
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reg = <0x1b00 0x100>,
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<0x1208 0x1>;
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reg-names = "bsi-base", "batt-id-status";
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label = "pm8941-bsi";
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interrupts = <0x0 0x1b 0x0>,
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<0x0 0x1b 0x1>,
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<0x0 0x1b 0x2>,
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<0x0 0x12 0x0>;
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interrupt-names = "err",
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"rx",
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"tx",
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"batt-present";
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qcom,sample-rate = <8>;
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qcom,min-clock-period = <15830>;
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qcom,max-clock-period = <122080>;
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qcom,channel-num = <0x31>;
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qcom,pullup-ohms = <100000>;
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qcom,vref-microvolts = <1800000>;
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};
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};
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};
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