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On ARM-based systems, a separate Cortex-M based System Control Processor (SCP) provides control on pins, as well as with power, clocks, reset controllers. In this case, kernel should use one of the possible transports, described in [0] to access SCP and control clocks/power-domains etc. This driver is using SMC transport to communicate with SCP via SCMI protocol and access to the Pin Control Subsystem. The provided driver consists of 2 parts: - firmware/arm_scmi/pinctrl.c - the SCMI pinctrl protocol inmplementation responsible for the communication with SCP firmware. - drivers/pinctrl/pinctrl-scmi.c - pinctrl driver, which is using pinctrl protocol implementation to access all necessary data. Configuration: The scmi-pinctrl driver can be configured using DT bindings. For example: / { cpu_scp_shm: scp-shmem@0x53FF0000 { compatible = "arm,scmi-shmem"; reg = <0x0 0x53FF0000 0x0 0x1000>; }; firmware { scmi { compatible = "arm,scmi-smc"; arm,smc-id = <0x82000002>; shmem = <&cpu_scp_shm>; #address-cells = <1>; #size-cells = <0>; scmi_pinctrl: protocol@19 { reg = <0x18>; #pinctrl-cells = <0>; i2c2_pins: i2c2 { groups = "i2c2_a"; function = "i2c2"; }; }; }; }; }; &pfc { /delete-node/i2c2; }; So basically, it's enough to move pfc subnode, which configures pin group that should work through SCMI protocol to scmi_pinctrl node. The current driver implementation is using generic pinctrl dt_node format. I've tested this driver on the Renesas H3ULCB Kingfisher board with pinctrl driver ported to the Arm-trusted-firmware. Unfortunately, not all hardware was possible to test because the Renesas pinctrl driver has gaps in pins and groups numeration, when Spec [0] requires pins, groups and functions numerations to be 0..n without gaps. Also, sharing link to the ATF pinctrl driver I used for testing: https://github.com/oleksiimoisieiev/arm-trusted-firmware/tree/pinctrl_rcar_m3_up [0] https://developer.arm.com/documentation/den0056/latest --- Changes v2 -> v3: - update get_name calls as suggested by Cristian Marussi - fixing comments - refactoring of the dt_bindings according to the comments Changes v1 -> v2: - rebase patches to the latest kernel version - use protocol helpers in the pinctrl scmi protocol driver implementation - reworked pinctrl_ops. Removed similar calls to simplify the interface - implementation of the .instance_deinit callback to properly clean resources - add description of the pinctrl protocol to the device-tree schema --- Oleksii Moisieiev (4): firmware: arm_scmi: Add optional flags to extended names helper firmware: arm_scmi: Add SCMI v3.2 pincontrol protocol basic support pinctrl: Implementation of the generic scmi-pinctrl driver dt-bindings: firmware: arm,scmi: Add support for pinctrl protocol .../bindings/firmware/arm,scmi.yaml | 53 ++ MAINTAINERS | 7 + drivers/firmware/arm_scmi/Makefile | 2 +- drivers/firmware/arm_scmi/clock.c | 2 +- drivers/firmware/arm_scmi/driver.c | 10 +- drivers/firmware/arm_scmi/perf.c | 3 +- drivers/firmware/arm_scmi/pinctrl.c | 836 ++++++++++++++++++ drivers/firmware/arm_scmi/power.c | 2 +- drivers/firmware/arm_scmi/powercap.c | 2 +- drivers/firmware/arm_scmi/protocols.h | 4 +- drivers/firmware/arm_scmi/reset.c | 3 +- drivers/firmware/arm_scmi/sensors.c | 2 +- drivers/firmware/arm_scmi/voltage.c | 2 +- drivers/pinctrl/Kconfig | 11 + drivers/pinctrl/Makefile | 1 + drivers/pinctrl/pinctrl-scmi.c | 554 ++++++++++++ include/linux/scmi_protocol.h | 47 + 17 files changed, 1530 insertions(+), 11 deletions(-) create mode 100644 drivers/firmware/arm_scmi/pinctrl.c create mode 100644 drivers/pinctrl/pinctrl-scmi.c