pinctrl: add support for Qualcomm Technologies QDF2xxx ARM64 SoCs

Add the pinctrl driver for the Qualcomm Technologies QDF2xxx ARM64 SoCs, which uses the Qualcomm Technologies TLMM pinctrl/gpio device. This driver is probed via ACPI and uses the pinctrl-msm.c backend driver.

This driver is intended to be used only an ACPI-enabled system. As such, UEFI will handle all pin control configuration, so this driver does not provide pin control functions. It is effectively a GPIO-only driver.

---
 drivers/pinctrl/qcom/Kconfig           |   8 +++
 drivers/pinctrl/qcom/Makefile          |   1 +
 drivers/pinctrl/qcom/pinctrl-qdf2xxx.c | 122 +++++++++++++++++++++++++++++++++
 3 files changed, 131 insertions(+)
 create mode 100644 drivers/pinctrl/qcom/pinctrl-qdf2xxx.c

index 58f5632..8a38323 100644
@@ -63,6 +63,14 @@ config PINCTRL_MSM8916
 	  This is the pinctrl, pinmux, pinconf and gpiolib driver for the
 	  Qualcomm TLMM block found on the Qualcomm 8916 platform.
 
+config PINCTRL_QDF2XXX
+	tristate "Qualcomm Technologies QDF2xxx pin controller driver"
+	depends on GPIOLIB && ACPI
+	select PINCTRL_MSM
+	help
+	  This is the GPIO driver for the TLMM block found on the
+	  Qualcomm Technologies QDF2xxx SOCs.
+
 config PINCTRL_QCOM_SPMI_PMIC
        tristate "Qualcomm SPMI PMIC pin controller driver"
        depends on GPIOLIB && OF && SPMI

index 3666c70..798d662 100644
@@ -7,5 +7,6 @@ obj-$(CONFIG_PINCTRL_MSM8660)	+= pinctrl-msm8660.o
 obj-$(CONFIG_PINCTRL_MSM8960)	+= pinctrl-msm8960.o
 obj-$(CONFIG_PINCTRL_MSM8X74)	+= pinctrl-msm8x74.o
 obj-$(CONFIG_PINCTRL_MSM8916)	+= pinctrl-msm8916.o
+obj-$(CONFIG_PINCTRL_QDF2XXX)	+= pinctrl-qdf2xxx.o
 obj-$(CONFIG_PINCTRL_QCOM_SPMI_PMIC) += pinctrl-spmi-gpio.o
 obj-$(CONFIG_PINCTRL_QCOM_SPMI_PMIC) += pinctrl-spmi-mpp.o

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

Regards,
Bjorn

In my experience, you will come back and add pin control to it if it ever sees any practical power-aware use cases.

For the same reason that Intel is doing it to their pin controllers, that also run on systems that are ACPI-enabled.

This version applied with Bj?rn's review tag.

Yours,
Linus Walleij