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 -- To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
