ramips: pinctrl: allow mux SDXC pins for mt76x8

The mt76x8 SDXC pin register definition is incompatible with the
mtmips generic pinctrl driver structure. This hack allows us to
mux the SDXC IO to different pin groups in device tree.

Signed-off-by: Shiji Yang <yangshiji66@qq.com>
Link: https://github.com/openwrt/openwrt/pull/17446
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

diff --git a/target/linux/ramips/patches-6.6/809-pinctrl-mtmips-allow-mux-SDXC-pins-for-mt76x8.patch b/target/linux/ramips/patches-6.6/809-pinctrl-mtmips-allow-mux-SDXC-pins-for-mt76x8.patch
new file mode 100644 (file)
index 0000000..69dcd7f
--- /dev/null
+++ b/target/linux/ramips/patches-6.6/809-pinctrl-mtmips-allow-mux-SDXC-pins-for-mt76x8.patch
@@ -0,0 +1,105 @@
+From: Shiji Yang <yangshiji66@outlook.com>
+Date: Wed, 1 Jan 2025 13:30:11 +0800
+Subject: [PATCH] pinctrl: mtmips: allow mux SDXC pins for mt76x8
+
+This is a hack to supprot two types of mt76x8 SDXC pinmaps:
+
+a) Use ethernet phy pins as SDXC IO.
+
+&pinctrl {
+       ephy-digital;
+
+       sdxc_iot_mode: sdxc_iot_mode {
+               esd {
+                       groups = "esd";
+                       function = "iot";
+               };
+
+               sdxc {
+                       groups = "sdmode";
+                       function = "sdxc";
+               };
+       };
+};
+
+b) Use I2S/I2C/GPIO0/UART1 pins as SDXC IO.
+
+&pinctrl {
+       ephy-analog;
+
+       sdxc_router_mode: sdxc_router_mode {
+               groups = "esd", "gpio", "i2c", "i2s", "sdmode", "uart1";
+               function = "gpio";
+       };
+};
+
+Signed-off-by: Shiji Yang <yangshiji66@outlook.com>
+---
+ drivers/pinctrl/mediatek/pinctrl-mt76x8.c | 24 ++++++++++++++++++++++-
+ 1 file changed, 22 insertions(+), 1 deletion(-)
+
+--- a/drivers/pinctrl/mediatek/pinctrl-mt76x8.c
++++ b/drivers/pinctrl/mediatek/pinctrl-mt76x8.c
+@@ -1,10 +1,13 @@
+ // SPDX-License-Identifier: GPL-2.0-only
+ 
++#include <asm/mach-ralink/ralink_regs.h>
+ #include <linux/module.h>
+ #include <linux/platform_device.h>
+ #include <linux/of.h>
+ #include "pinctrl-mtmips.h"
+ 
++#define SYSC_REG_AGPIO_CFG            0x3c
++
+ #define MT76X8_GPIO_MODE_MASK         0x3
+ 
+ #define MT76X8_GPIO_MODE_P4LED_KN     58
+@@ -26,6 +29,7 @@
+ #define MT76X8_GPIO_MODE_I2C          20
+ #define MT76X8_GPIO_MODE_REFCLK               18
+ #define MT76X8_GPIO_MODE_PERST                16
++#define MT76X8_GPIO_MODE_ESD          15
+ #define MT76X8_GPIO_MODE_WDT          14
+ #define MT76X8_GPIO_MODE_SPI          12
+ #define MT76X8_GPIO_MODE_SDMODE               10
+@@ -74,6 +78,12 @@ static struct mtmips_pmx_func refclk_grp
+ static struct mtmips_pmx_func perst_grp[] = { FUNC("perst", 0, 36, 1) };
+ static struct mtmips_pmx_func wdt_grp[] = { FUNC("wdt", 0, 38, 1) };
+ static struct mtmips_pmx_func spi_grp[] = { FUNC("spi", 0, 7, 4) };
++/*
++ * "esd" (Ethernet SDXC) group supports two mode:
++ * "gpio" - SDXC mux to I2S/I2C/GPIO0/UART1 pins with "gpio" mode
++ * "iot"  - SDXC mux to EPHY pins, eth p1-p4 pad must be set to "digital"
++ */
++static struct mtmips_pmx_func esd_grp[] = { FUNC("iot", 0, 47, 1) };
+ 
+ static struct mtmips_pmx_func sd_mode_grp[] = {
+       FUNC("jtag", 3, 22, 8),
+@@ -216,6 +226,7 @@ static struct mtmips_pmx_group mt76x8_pi
+       GRP("perst", perst_grp, 1, MT76X8_GPIO_MODE_PERST),
+       GRP("wdt", wdt_grp, 1, MT76X8_GPIO_MODE_WDT),
+       GRP("spi", spi_grp, 1, MT76X8_GPIO_MODE_SPI),
++      GRP("esd", esd_grp, 1, MT76X8_GPIO_MODE_ESD),
+       GRP_G("sdmode", sd_mode_grp, MT76X8_GPIO_MODE_MASK,
+                               1, MT76X8_GPIO_MODE_SDMODE),
+       GRP_G("uart0", uart0_grp, MT76X8_GPIO_MODE_MASK,
+@@ -257,7 +268,18 @@ static struct mtmips_pmx_group mt76x8_pi
+ 
+ static int mt76x8_pinctrl_probe(struct platform_device *pdev)
+ {
+-      return mtmips_pinctrl_init(pdev, mt76x8_pinmux_data);
++      int ret;
++
++      ret = mtmips_pinctrl_init(pdev, mt76x8_pinmux_data);
++      if (ret)
++              return ret;
++
++      if (of_property_present(pdev->dev.of_node, "ephy-analog"))
++              rt_sysc_m32(0xf << 17, 0, SYSC_REG_AGPIO_CFG);
++      else if (of_property_present(pdev->dev.of_node, "ephy-digital"))
++              rt_sysc_m32(0xf << 17, 0xf << 17, SYSC_REG_AGPIO_CFG);
++
++      return ret;
+ }
+ 
+ static const struct of_device_id mt76x8_pinctrl_match[] = {