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bindings: arm: msm: Add documentation for sdx ipc driver

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This is a snapshot of the sdx ipc driverdriver as of msm-4.14
commit a5650700 ("drivers: qcom: sdx_ext_ipc: keep wakeup irq
always on").

Change-Id: I27eb35b33284be8c221cd873323a488101a2f5e8
This commit is contained in:
Yogesh Lal 2021-06-17 17:26:10 +05:30 • committed by Karthick Shanmugham
commit 2da93d1f34
1 changed files with 34 additions and 0 deletions
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34
bindings/arm/msm/sdx-ext-ipc.txt Normal file
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Modem chipset attached to Application processor
Modem chipset can be connected to an external apss processor. The control
channel between the two chipsets consists of gpios that can relay the
state of one subsytem to another. Modem can indicate different events
(bootup/crash etc.) to AP and can get the same information from AP.
Required Properties:
- compatible: "qcom,sdx-ext-ipc".
Optional named gpio properties:
- qcom,status-out-gpio: gpio to indicate the boot status to remote processor.
- qcom,status-in-gpio: gpio for remote processor to indicate the boot status.
- qcom,status-out2-gpio: gpio to indicate to remote processor that it is in
E911 call or doing firmware upgrade.
- qcom,default-policy-nop: Set default policy from PANIC to NOP.
- qcom,wakeup-gpio-out: gpio to wakeup remote AP or modem.
- qcom,wakeup-gpio-in: input gpio to receive wakeup signal from remote AP or
modem.
Example:
sdx_ext_ipc: qcom,sdx_ext_ipc {
compatible = "qcom,sdx-ext-ipc";
qcom,status-in-gpio = <&tlmm 64 0x00>;
qcom,status-out-gpio = <&tlmm 63 0x00>;
qcom,status-out2-gpio = <&tlmm 66 0x00>;
qcom,wakeup-gpio-in = <&tlmm 67 0x00>;
qcom,wakeup-gpio-out = <&tlmm 68 0x00>;
};