Re: [PATCH 3/3] pinctrl: qcom: qdf2xxx: add support for new ACPI HID QCOM8002

[Linus Walleij <linus.walleij@xxxxxxxxxx>]

On Thu, Apr 26, 2018 at 12:43 AM, Timur Tabi <timur@xxxxxxxxxxxxxx> wrote:

> Newer versions of the firmware for the Qualcomm Datacenter Technologies
> QDF2400 restricts access to a subset of the GPIOs on the TLMM.  To
> prevent older kernels from accidentally accessing the restricted GPIOs,
> we change the ACPI HID for the TLMM block from QCOM8001 to QCOM8002,
> and introduce a new property "gpios".  This property is an array of
> specific GPIOs that are accessible.  When an older kernel boots on
> newer (restricted) firmware, it will fail to probe.
>
> To implement the sparse GPIO map, we register all of the GPIOs, but
> fill in the data only for available GPIOs.  This ensures that the driver
> cannot accidentally access an unavailable GPIO.
>
> The pinctrl-msm driver also scans the "gpios" property to determine
> which pins are available, and ensure that only those can be registered.
>
> Support for QCOM8001 is removed as there is no longer any firmware that
> implements it.
>
> Signed-off-by: Timur Tabi <timur@xxxxxxxxxxxxxx>
> Acked-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
> Reviewed-by: Stephen Boyd <swboyd@xxxxxxxxxxxx>

Patch applied for v4.18.

Yours,
Linus Walleij
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