On Tue, 2017-12-12 at 14:50 -0600, Timur Tabi 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 > set > the pin count for the unavailable GPIOs to zero. The pinctrl-msm > driver will block those unavailable GPIOs from being accessed. > > To allow newer kernels to support older firmware, the driver retains > support for QCOM8001. Please, read my comments to v8, same applies here. -- Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx> Intel Finland Oy -- 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
