linux-kernel - [PATCH 1/2] pinctrl: imx: Support NXP scmi extended mux config

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Message-Id: <20251217-imx952-pin-v1-1-2747f09144dd@nxp.com>
Date: Wed, 17 Dec 2025 10:40:45 +0800
From: "Peng Fan (OSS)" <peng.fan@....nxp.com>
To: Dong Aisheng <aisheng.dong@....com>, Fabio Estevam <festevam@...il.com>, 
 Shawn Guo <shawnguo@...nel.org>, Jacky Bai <ping.bai@....com>, 
 Pengutronix Kernel Team <kernel@...gutronix.de>, 
 NXP S32 Linux Team <s32@....com>, Linus Walleij <linusw@...nel.org>, 
 Sascha Hauer <s.hauer@...gutronix.de>, Sudeep Holla <sudeep.holla@....com>, 
 Cristian Marussi <cristian.marussi@....com>
Cc: linux-gpio@...r.kernel.org, imx@...ts.linux.dev, 
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 arm-scmi@...r.kernel.org, Peng Fan <peng.fan@....com>, 
 Ranjani Vaidyanathan <ranjani.vaidyanathan@....com>
Subject: [PATCH 1/2] pinctrl: imx: Support NXP scmi extended mux config

From: Ranjani Vaidyanathan <ranjani.vaidyanathan@....com>

i.MX94 has special muxing options for certain pins. Their mux settings
are not in IOMUXC module. i.MX System Manager Firmware includes new vendor
defined pinctrl type to SCMI pinctrl driver to handle these pins. The MUX
value field in the IOMUX table is extended to 16 bits where the lower 8
bits represent the current IOMUX value and the upper 8 bits represent the
new extended mux added in i.MX94.

Signed-off-by: Ranjani Vaidyanathan <ranjani.vaidyanathan@....com>
Signed-off-by: Peng Fan <peng.fan@....com>
---
 drivers/pinctrl/freescale/pinctrl-imx-scmi.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/pinctrl/freescale/pinctrl-imx-scmi.c b/drivers/pinctrl/freescale/pinctrl-imx-scmi.c
index 4e8ab919b334a11e3e716c4580e18bb0e65a6c02..04728ad807d38367a19e6e774d4ccc985549ecfe 100644
--- a/drivers/pinctrl/freescale/pinctrl-imx-scmi.c
+++ b/drivers/pinctrl/freescale/pinctrl-imx-scmi.c
@@ -38,11 +38,12 @@ struct scmi_pinctrl_imx {
 };
 
 /* SCMI pin control types, aligned with SCMI firmware */
-#define IMX_SCMI_NUM_CFG	4
+#define IMX_SCMI_NUM_CFG	5
 #define IMX_SCMI_PIN_MUX	192
 #define IMX_SCMI_PIN_CONFIG	193
 #define IMX_SCMI_PIN_DAISY_ID	194
 #define IMX_SCMI_PIN_DAISY_CFG	195
+#define IMX_SCMI_PIN_EXT	196
 
 #define IMX_SCMI_NO_PAD_CTL		BIT(31)
 #define IMX_SCMI_PAD_SION		BIT(30)
@@ -118,7 +119,14 @@ static int pinctrl_scmi_imx_dt_node_to_map(struct pinctrl_dev *pctldev,
 
 		pin_id = mux_reg / 4;
 
-		cfg[j++] = pinconf_to_config_packed(IMX_SCMI_PIN_MUX, mux_val);
+		cfg[j++] = pinconf_to_config_packed(IMX_SCMI_PIN_MUX, (mux_val & 0xFF));
+
+		if (mux_val & 0xFF00) {
+			int ext_val = (mux_val & 0xFF00) >> 8;
+
+			cfg[j++] = pinconf_to_config_packed(IMX_SCMI_PIN_EXT, ext_val);
+		} else
+			ncfg--;
 
 		if (!conf_reg || (conf_val & IMX_SCMI_NO_PAD_CTL))
 			ncfg--;

-- 
2.37.1