[PATCH] pinctrl: scmi: support i.MX OEM pin configuration type

[Peng Fan (OSS)]

From: Peng Fan <peng.fan at nxp.com>

i.MX95 System Manager FW supports SCMI PINCTRL protocol, but uses
OEM Pin Configuration type, so extend the driver to support custom
params.

Signed-off-by: Peng Fan <peng.fan at nxp.com>
---

V1:
 Based on https://lore.kernel.org/all/20240223-pinctrl-scmi-v4-0-10eb5a379274@nxp.com/
 This is an reimplementation for supporting i.MX95 OEM settings.
 With this patch, the dts will be like:

+#define IMX95_PAD_SD1_CLK__USDHC1_CLK(val)	\
+	sd1clk {				\
+		pins = "sd1clk";		\
+		imx,func-id = <0>;		\
+		imx,pin-conf = <val>;		\
+	}
  ....
+
+	pinctrl_usdhc1: usdhc1grp {
+		IMX95_PAD_SD1_CLK__USDHC1_CLK(0x158e);
+		IMX95_PAD_SD1_CMD__USDHC1_CMD(0x138e);
 ....
+	};

 drivers/pinctrl/pinctrl-scmi.c | 10 ++++++++++
 drivers/pinctrl/pinctrl-scmi.h | 15 +++++++++++++++
 2 files changed, 25 insertions(+)
 create mode 100644 drivers/pinctrl/pinctrl-scmi.h

diff --git a/drivers/pinctrl/pinctrl-scmi.c b/drivers/pinctrl/pinctrl-scmi.c
index f2fef3fb85ae..e58f1aaf9963 100644
--- a/drivers/pinctrl/pinctrl-scmi.c
+++ b/drivers/pinctrl/pinctrl-scmi.c
@@ -19,6 +19,7 @@
 #include <linux/pinctrl/pinctrl.h>
 #include <linux/pinctrl/pinmux.h>
 
+#include "pinctrl-scmi.h"
 #include "pinctrl-utils.h"
 #include "core.h"
 #include "pinconf.h"
@@ -472,6 +473,13 @@ static const struct pinconf_ops pinctrl_scmi_pinconf_ops = {
 	.pin_config_config_dbg_show = pinconf_generic_dump_config,
 };
 
+static const struct pinconf_generic_params pinctrl_scmi_oem_dt_params[] = {
+	{"imx,func-id", IMX_SCMI_PIN_MUX, -1},
+	{"imx,daisy-id", IMX_SCMI_PIN_DAISY_ID, -1},
+	{"imx,daisy-conf", IMX_SCMI_PIN_DAISY_CFG, -1},
+	{"imx,pin-conf", IMX_SCMI_PIN_CONF, -1},
+};
+
 static int pinctrl_scmi_get_pins(struct scmi_pinctrl *pmx,
 				 unsigned int *nr_pins,
 				 const struct pinctrl_pin_desc **pins)
@@ -548,6 +556,8 @@ static int scmi_pinctrl_probe(struct scmi_device *sdev)
 	pmx->pctl_desc.pctlops = &pinctrl_scmi_pinctrl_ops;
 	pmx->pctl_desc.pmxops = &pinctrl_scmi_pinmux_ops;
 	pmx->pctl_desc.confops = &pinctrl_scmi_pinconf_ops;
+	pmx->pctl_desc.custom_params = pinctrl_scmi_oem_dt_params;
+	pmx->pctl_desc.num_custom_params = ARRAY_SIZE(pinctrl_scmi_oem_dt_params);
 
 	ret = pinctrl_scmi_get_pins(pmx, &pmx->pctl_desc.npins,
 				    &pmx->pctl_desc.pins);
diff --git a/drivers/pinctrl/pinctrl-scmi.h b/drivers/pinctrl/pinctrl-scmi.h
new file mode 100644
index 000000000000..fcc61bc19c98
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-scmi.h
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright 2024 NXP
+ */
+
+#ifndef __DRIVERS_PINCTRL_SCMI_H
+#define __DRIVERS_PINCTRL_SCMI_H
+
+/* OEM VENDOR Pin Configuration Type */
+#define IMX_SCMI_PIN_MUX	192
+#define IMX_SCMI_PIN_CONF	193
+#define IMX_SCMI_PIN_DAISY_ID	194
+#define IMX_SCMI_PIN_DAISY_CFG	195
+
+#endif /* __DRIVERS_PINCTRL_SCMI_H */
-- 
2.37.1