[PATCH v4 0/3] pinctrl: scmi: support i.MX95 OEM extensions

[Peng Fan (OSS)]

ARM SCMI v3.2 Table 24 Pin Configuration Type and Enumerations:
'192 -255 OEM specific units'.

i.MX95 System Manager FW supports SCMI PINCTRL protocol, but it has zero
functions, groups. So pinctrl-scmi.c could not be reused for i.MX95.
Because nxp,pin-func, nxp,pin-conf properties are rejected by dt
maintainers, so use generic property 'pinmux' which requires a new driver
pinctrl-imx-scmi.c

The node will be as below:
 pinctrl_usdhc1: usdhc1-pins {
         sd1-grp0 {
                 pinmux = <IMX95_PAD_SD1_CLK__USDHC1_CLK
                           IMX95_PAD_SD1_STROBE__USDHC1_STROBE>;
                 drive-strength = <0xe>;
                 input-schmitt-enable;
                 bias-pull-down;
                 slew-rate = <0x3>;
         };
         sd1-grp1 {
                 pinmux = <IMX95_PAD_SD1_CMD__USDHC1_CMD
                           IMX95_PAD_SD1_DATA0__USDHC1_DATA0
                           IMX95_PAD_SD1_DATA1__USDHC1_DATA1
                           IMX95_PAD_SD1_DATA2__USDHC1_DATA2
                           IMX95_PAD_SD1_DATA3__USDHC1_DATA3
                           IMX95_PAD_SD1_DATA4__USDHC1_DATA4
                           IMX95_PAD_SD1_DATA5__USDHC1_DATA5
                           IMX95_PAD_SD1_DATA6__USDHC1_DATA6
                           IMX95_PAD_SD1_DATA7__USDHC1_DATA7>;
                 drive-strength = <0xe>;
                 input-schmitt-enable;
                 bias-pull-up;
                 slew-rate = <0x3>;
         };
 };

Signed-off-by: Peng Fan <peng.fan at nxp.com>
---
Changes in v4:
- Rebase to next-20240503 
- Add pinctrl-scmi-imx.c itself get pins and scmi pinctrl structure to decouple
  pinctrl-scmi.c and pinctrl-scmi-imx.c, so drop patch 3,4,5.
- Link to v3: https://lore.kernel.org/r/20240428-pinctrl-scmi-oem-v3-v3-0-eda341eb47ed@nxp.com

Changes in v3:
- patch 2,3,4,5 are new.
- Rewrite the binding, drop nxp,pin-x properties, use generic properties
  as Rob commented.
- Switch to using pinmux means pinctrl-scmi.c could not be reused, so
  add a new driver in patch 6 for i.MX95. But pinctrl_scmi_get_pins and
  scmi_pinctrl are exported for i.MX95 usage.
- Link to v2: https://lore.kernel.org/r/20240418-pinctrl-scmi-oem-v1-v2-0-3a555a3c58c3@nxp.com

Changes in v2:
- Rename nxp,imx95-pinctrl.yaml  to nxp,imx95-scmi-pinctrl.yaml and move
  to firmware
- Merged patch [1,2]/3 v1 into patch 1/2 v2.
- nxp,imx95-scmi-pinctrl.yaml only has patterProperties for subnode
  The pinctrl will be as below for i.MX95.
        pinctrl_usdhc1: usdhc1-pins {
                sd1cmd {
                        pins = "sd1cmd";
                        nxp,func-id = <0>;
                        nxp,pin-conf = <0x138e>;
                };
                sd1data {
                        pins = "sd1data";
                        nxp,func-id = <0>;
                        nxp,pin-conf = <0x138e>;
                };
        };
- Add pins enum, correct description.
- Link to v1: https://lore.kernel.org/r/20240412-pinctrl-scmi-oem-v1-v1-0-704f242544c1@nxp.com

---
Peng Fan (3):
      dt-bindings: firmware: arm,scmi: Add properties for i.MX95 Pinctrl OEM extensions
      pinctrl: scmi: add blocklist
      pinctrl: imx: support SCMI pinctrl protocol for i.MX95

 .../devicetree/bindings/firmware/arm,scmi.yaml     |   9 +-
 .../bindings/firmware/nxp,imx95-scmi-pinctrl.yaml  |  37 ++
 drivers/pinctrl/freescale/Kconfig                  |   9 +
 drivers/pinctrl/freescale/Makefile                 |   1 +
 drivers/pinctrl/freescale/pinctrl-imx-scmi.c       | 586 +++++++++++++++++++++
 drivers/pinctrl/pinctrl-scmi.c                     |  10 +
 6 files changed, 649 insertions(+), 3 deletions(-)
---
base-commit: 4db57327adc359a3f9a3481d60104be67c42964f
change-id: 20240428-pinctrl-scmi-oem-v3-12130031a74d

Best regards,
-- 
Peng Fan <peng.fan at nxp.com>