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    Subject[PATCH 2/3] dt-bindings: pinctrl: Add a ngpios-ranges property
    Date
    Some qcom platforms make some GPIOs or pins unavailable for use
    by non-secure operating systems, and thus reading or writing the
    registers for those pins will cause access control issues.
    Introduce a DT property to describe the set of GPIOs that are
    available for use so that higher level OSes are able to know what
    pins to avoid reading/writing.

    Cc: <devicetree@vger.kernel.org>
    Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
    ---

    I stuck this inside msm8996, but maybe it can go somewhere more generic?

    Documentation/devicetree/bindings/pinctrl/qcom,msm8996-pinctrl.txt | 6 ++++++
    1 file changed, 6 insertions(+)

    diff --git a/Documentation/devicetree/bindings/pinctrl/qcom,msm8996-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/qcom,msm8996-pinctrl.txt
    index aaf01e929eea..8354ab270486 100644
    --- a/Documentation/devicetree/bindings/pinctrl/qcom,msm8996-pinctrl.txt
    +++ b/Documentation/devicetree/bindings/pinctrl/qcom,msm8996-pinctrl.txt
    @@ -40,6 +40,12 @@ MSM8996 platform.
    Definition: must be 2. Specifying the pin number and flags, as defined
    in <dt-bindings/gpio/gpio.h>

    +- ngpios-ranges:
    + Usage: optional
    + Value type: <prop-encoded-array>
    + Definition: Tuples of GPIO ranges (base, size) indicating
    + GPIOs available for use.
    +
    Please refer to ../gpio/gpio.txt and ../interrupt-controller/interrupts.txt for
    a general description of GPIO and interrupt bindings.

    --
    The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
    a Linux Foundation Collaborative Project
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