linux-kernel - [PATCH] pinctrl: airoha: fix wrong MDIO function bitmaks

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Message-ID: <20250908113723.31559-1-ansuelsmth@gmail.com>
Date: Mon,  8 Sep 2025 13:37:19 +0200
From: Christian Marangi <ansuelsmth@...il.com>
To: Lorenzo Bianconi <lorenzo@...nel.org>,
	Sean Wang <sean.wang@...nel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Benjamin Larsson <benjamin.larsson@...exis.eu>,
	linux-mediatek@...ts.infradead.org,
	linux-gpio@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Cc: Christian Marangi <ansuelsmth@...il.com>,
	stable@...r.kernel.org
Subject: [PATCH] pinctrl: airoha: fix wrong MDIO function bitmaks

With further testing with an attached Aeonsemi it was discovered that
the pinctrl MDIO function applied the wrong bitmask. The error was
probably caused by the confusing documentation related to these bits.

Inspecting what the bootloader actually configure, the SGMII_MDIO_MODE
is never actually set but instead it's set force enable to the 2 GPIO
(gpio 1-2) for MDC and MDIO pin.

Applying this configuration permits correct functionality of any
externally attached PHY.

Cc: stable@...r.kernel.org
Fixes: 1c8ace2d0725 ("pinctrl: airoha: Add support for EN7581 SoC")
Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
---
 drivers/pinctrl/mediatek/pinctrl-airoha.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/drivers/pinctrl/mediatek/pinctrl-airoha.c b/drivers/pinctrl/mediatek/pinctrl-airoha.c
index f7f8fd2f35fc..d89da9581c55 100644
--- a/drivers/pinctrl/mediatek/pinctrl-airoha.c
+++ b/drivers/pinctrl/mediatek/pinctrl-airoha.c
@@ -108,6 +108,9 @@
 #define JTAG_UDI_EN_MASK			BIT(4)
 #define JTAG_DFD_EN_MASK			BIT(3)
 
+#define REG_FORCE_GPIO_EN			0x0228
+#define FORCE_GPIO_EN(n)			BIT(n)
+
 /* LED MAP */
 #define REG_LAN_LED0_MAPPING			0x027c
 #define REG_LAN_LED1_MAPPING			0x0280
@@ -718,17 +721,17 @@ static const struct airoha_pinctrl_func_group mdio_func_group[] = {
 	{
 		.name = "mdio",
 		.regmap[0] = {
-			AIROHA_FUNC_MUX,
-			REG_GPIO_PON_MODE,
-			GPIO_SGMII_MDIO_MODE_MASK,
-			GPIO_SGMII_MDIO_MODE_MASK
-		},
-		.regmap[1] = {
 			AIROHA_FUNC_MUX,
 			REG_GPIO_2ND_I2C_MODE,
 			GPIO_MDC_IO_MASTER_MODE_MODE,
 			GPIO_MDC_IO_MASTER_MODE_MODE
 		},
+		.regmap[1] = {
+			AIROHA_FUNC_MUX,
+			REG_FORCE_GPIO_EN,
+			FORCE_GPIO_EN(1) | FORCE_GPIO_EN(2),
+			FORCE_GPIO_EN(1) | FORCE_GPIO_EN(2)
+		},
 		.regmap_size = 2,
 	},
 };
-- 
2.51.0