linux-kernel - [PATCH 2/5] arm64: dts: imx8mm: Add pinctrl config definitions

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Message-Id: <20251009-mini_iv-v1-2-f3889c492457@gocontroll.com>
Date: Thu, 09 Oct 2025 12:54:18 +0200
From: Maud Spierings via B4 Relay <devnull+maudspierings.gocontroll.com@...nel.org>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>, 
 Sascha Hauer <s.hauer@...gutronix.de>, 
 Pengutronix Kernel Team <kernel@...gutronix.de>, 
 Fabio Estevam <festevam@...il.com>
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org, 
 Maud Spierings <maudspierings@...ontroll.com>
Subject: [PATCH 2/5] arm64: dts: imx8mm: Add pinctrl config definitions

From: Maud Spierings <maudspierings@...ontroll.com>

Currently to configure each IOMUXC_SW_PAD_CTL_PAD the raw value of this
register is written in the dts, these values are not obvious. Add defines
which describe the fields of this register which can be or-ed together to
produce readable settings.

Signed-off-by: Maud Spierings <maudspierings@...ontroll.com>
---
 arch/arm64/boot/dts/freescale/imx8mm-pinfunc.h | 33 ++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8mm-pinfunc.h b/arch/arm64/boot/dts/freescale/imx8mm-pinfunc.h
index b1f11098d248e..31557b7b9ccc1 100644
--- a/arch/arm64/boot/dts/freescale/imx8mm-pinfunc.h
+++ b/arch/arm64/boot/dts/freescale/imx8mm-pinfunc.h
@@ -6,6 +6,39 @@
 #ifndef __DTS_IMX8MM_PINFUNC_H
 #define __DTS_IMX8MM_PINFUNC_H
 
+/* Drive Strength */
+#define MX8MM_DSE_X1		0x0
+#define MX8MM_DSE_X2		0x4
+#define MX8MM_DSE_X4		0x2
+#define MX8MM_DSE_X6		0x6
+
+/* Slew Rate */
+#define MX8MM_FSEL_FAST		0x10
+#define MX8MM_FSEL_SLOW		0x0
+
+/* Open Drain */
+#define MX8MM_ODE_ENABLE	0x20
+#define MX8MM_ODE_DISABLE	0x0
+
+#define MX8MM_PULL_DOWN		0x0
+#define MX8MM_PULL_UP		0x40
+
+/* Hysteresis */
+#define MX8MM_HYS_CMOS		0x0
+#define MX8MM_HYS_SCHMITT	0x80
+
+#define MX8MM_PULL_ENABLE	0x100
+#define MX8MM_PULL_DISABLE	0x0
+
+/* SION force input mode */
+#define MX8MM_SION		0x40000000
+
+/* long defaults */
+#define MX8MM_USDHC_DATA_DEFAULT (MX8MM_FSEL_FAST | MX8MM_PULL_UP | \
+				  MX8MM_HYS_SCHMITT | MX8MM_PULL_ENABLE)
+#define MX8MM_I2C_DEFAULT (MX8MM_DSE_X6 | MX8MM_PULL_UP | MX8MM_HYS_SCHMITT | \
+			   MX8MM_PULL_ENABLE | MX8MM_SION)
+
 /*
  * The pin function ID is a tuple of
  * <mux_reg conf_reg input_reg mux_mode input_val>

-- 
2.51.0