[PATCH 0/7] firmware: arm_scmi: Add SCMI v3.2 pincontrol protocol basic support

[Peng Fan (OSS)]

This patchset is a rework from Oleksii's RFC v5 patchset
https://lore.kernel.org/all/cover.1698353854.git.oleksii_moisieiev@xxxxxxxx/

This patchset introduces some changes based on RFC v5:
- introduce helper get_max_msg_size
- support compatible string
- iterate the id_table
- Support multiple configs in one command
- Added i.MX support
- Patch 5 firmware: arm_scmi: Add SCMI v3.2 pincontrol protocol basic support
  is almost same as RFCv5 expect multiple configs support.
- Patch 4 the dt-bindings includes compatible string to support i.MX
- Rebased on 2023-12-15 linux-next/master

If any comments from RFC v5 are missed, I am sorry in advance.

This PINCTRL Protocol is following Version 3.2 SCMI Spec Beta release.

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. So implement the driver to support such cases.

The i.MX95 Example as below:

Configuration:
The scmi-pinctrl driver can be configured using DT bindings.
For example:
/ {
	sram0: sram@445b1000 {
		compatible = "mmio-sram";
		reg = <0x0 0x445b1000 0x0 0x400>;

		#address-cells = <1>;
		#size-cells = <1>;
		ranges = <0x0 0x0 0x445b1000 0x400>;

		scmi_buf0: scmi-sram-section@0 {
			compatible = "arm,scmi-shmem";
			reg = <0x0 0x80>;
		};

		scmi_buf1: scmi-sram-section@80 {
			compatible = "arm,scmi-shmem";
			reg = <0x80 0x80>;
		};
	};

	firmware {
		scmi {
			compatible = "arm,scmi";
			mboxes = <&mu2 5 0>, <&mu2 3 0>, <&mu2 3 1>;
			shmem = <&scmi_buf0>, <&scmi_buf1>;
			#address-cells = <1>;
			#size-cells = <0>;

			scmi_iomuxc: protocol@19 {
				compatible = "fsl,imx95-scmi-pinctrl";
				reg = <0x19>;
			};
		};
	};
};

&scmi_iomuxc {
	pinctrl_tpm3: tpm3grp {
		fsl,pins = <
			IMX95_PAD_GPIO_IO12__TPM3_CH2		0x51e
		>;
	};
};

This patchset has been tested on i.MX95-19x19-EVK board.

Signed-off-by: Peng Fan <peng.fan@xxxxxxx>
---
Oleksii Moisieiev (1):
      firmware: arm_scmi: Add SCMI v3.2 pincontrol protocol basic support

Peng Fan (6):
      firmware: arm_scmi: introduce helper get_max_msg_size
      firmware: scmi: support compatible string
      firmware: arm_scmi: bus: iterate the id_table
      dt-bindings: firmware: arm,scmi: support pinctrl protocol
      pinctrl: Implementation of the generic scmi-pinctrl driver
      pinctrl: scmi: implement pinctrl_scmi_imx_dt_node_to_map

 .../devicetree/bindings/firmware/arm,scmi.yaml     |  99 +++
 MAINTAINERS                                        |   7 +
 drivers/firmware/arm_scmi/Makefile                 |   1 +
 drivers/firmware/arm_scmi/bus.c                    |  49 +-
 drivers/firmware/arm_scmi/common.h                 |   2 +-
 drivers/firmware/arm_scmi/driver.c                 |  32 +-
 drivers/firmware/arm_scmi/pinctrl.c                | 927 +++++++++++++++++++++
 drivers/firmware/arm_scmi/protocols.h              |   2 +
 drivers/pinctrl/Kconfig                            |  11 +
 drivers/pinctrl/Makefile                           |   1 +
 drivers/pinctrl/pinctrl-scmi-imx.c                 | 117 +++
 drivers/pinctrl/pinctrl-scmi.c                     | 419 ++++++++++
 drivers/pinctrl/pinctrl-scmi.h                     |  12 +
 include/linux/scmi_protocol.h                      |  48 ++
 14 files changed, 1710 insertions(+), 17 deletions(-)
---
base-commit: 17cb8a20bde66a520a2ca7aad1063e1ce7382240
change-id: 20231215-pinctrl-scmi-4c5b0374f4c6

Best regards,
-- 
Peng Fan <peng.fan@xxxxxxx>