linux-kernel - [PATCH] arm64: dts: ti: k3-am62a7-sk: Disable mmc Schmitt Trigger

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Message-Id: <20260106-topic-am62a-mmc-pinctrl-v6-19-next-v1-1-1190ac29aadb@baylibre.com>
Date: Tue, 06 Jan 2026 17:22:10 +0100
From: "Markus Schneider-Pargmann (TI.com)" <msp@...libre.com>
To: Nishanth Menon <nm@...com>, Vignesh Raghavendra <vigneshr@...com>, 
 Tero Kristo <kristo@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Alexander Sverdlin <alexander.sverdlin@...il.com>
Cc: Vishal Mahaveer <vishalm@...com>, Kevin Hilman <khilman@...libre.com>, 
 Dhruva Gole <d-gole@...com>, Sebin Francis <sebin.francis@...com>, 
 Kendall Willis <k-willis@...com>, Akashdeep Kaur <a-kaur@...com>, 
 linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, 
 "Markus Schneider-Pargmann (TI.com)" <msp@...libre.com>
Subject: [PATCH] arm64: dts: ti: k3-am62a7-sk: Disable mmc Schmitt Trigger

Remove Schmitt Trigger from mmc pins. With Schmitt Trigger enabled
u-boot SPL is not able to read u-boot from mmc:

    Trying to boot from MMC2
    Error reading cluster
    spl_load_image_fat: error reading image u-boot.img, err - -22
    Error: -22
    SPL: Unsupported Boot Device!
    SPL: failed to boot from all boot devices
    ### ERROR ### Please RESET the board ###

I bisected this issue between u-boot v2025.10 and v2026.01 and found the
devicetree merge to be the problem. At a closer look I found the
k3-pinctrl.h changes. Disabling the Schmitt Trigger fixes the u-boot SPL
failure to read from mmc.

Fixes: 5b272127884b ("arm64: dts: ti: k3-pinctrl: Enable Schmitt Trigger by default")
Signed-off-by: Markus Schneider-Pargmann (TI.com) <msp@...libre.com>
---
 arch/arm64/boot/dts/ti/k3-am62a7-sk.dts | 36 ++++++++++++++++-----------------
 1 file changed, 18 insertions(+), 18 deletions(-)

diff --git a/arch/arm64/boot/dts/ti/k3-am62a7-sk.dts b/arch/arm64/boot/dts/ti/k3-am62a7-sk.dts
index e99bdbc2e0cbdf858f1631096f9c2a086191bab3..9129045c8bbd3a83dba6ff6f2148a3624b91b546 100644
--- a/arch/arm64/boot/dts/ti/k3-am62a7-sk.dts
+++ b/arch/arm64/boot/dts/ti/k3-am62a7-sk.dts
@@ -315,30 +315,30 @@ AM62AX_IOPAD(0x0b4, PIN_INPUT_PULLUP, 1) /* (K24) GPMC0_CSn3.I2C2_SDA */
 
 	main_mmc0_pins_default: main-mmc0-default-pins {
 		pinctrl-single,pins = <
-			AM62AX_IOPAD(0x220, PIN_INPUT, 0) /* (Y3) MMC0_CMD */
-			AM62AX_IOPAD(0x218, PIN_INPUT, 0) /* (AB1) MMC0_CLKLB */
-			AM62AX_IOPAD(0x21c, PIN_INPUT, 0) /* (AB1) MMC0_CLK */
-			AM62AX_IOPAD(0x214, PIN_INPUT, 0) /* (AA2) MMC0_DAT0 */
-			AM62AX_IOPAD(0x210, PIN_INPUT_PULLUP, 0) /* (AA1) MMC0_DAT1 */
-			AM62AX_IOPAD(0x20c, PIN_INPUT_PULLUP, 0) /* (AA3) MMC0_DAT2 */
-			AM62AX_IOPAD(0x208, PIN_INPUT_PULLUP, 0) /* (Y4) MMC0_DAT3 */
-			AM62AX_IOPAD(0x204, PIN_INPUT_PULLUP, 0) /* (AB2) MMC0_DAT4 */
-			AM62AX_IOPAD(0x200, PIN_INPUT_PULLUP, 0) /* (AC1) MMC0_DAT5 */
-			AM62AX_IOPAD(0x1fc, PIN_INPUT_PULLUP, 0) /* (AD2) MMC0_DAT6 */
-			AM62AX_IOPAD(0x1f8, PIN_INPUT_PULLUP, 0) /* (AC2) MMC0_DAT7 */
+			AM62AX_IOPAD(0x220, PIN_INPUT_NOST, 0) /* (Y3) MMC0_CMD */
+			AM62AX_IOPAD(0x218, PIN_INPUT_NOST, 0) /* (AB1) MMC0_CLKLB */
+			AM62AX_IOPAD(0x21c, PIN_INPUT_NOST, 0) /* (AB1) MMC0_CLK */
+			AM62AX_IOPAD(0x214, PIN_INPUT_NOST, 0) /* (AA2) MMC0_DAT0 */
+			AM62AX_IOPAD(0x210, PIN_INPUT_PULLUP_NOST, 0) /* (AA1) MMC0_DAT1 */
+			AM62AX_IOPAD(0x20c, PIN_INPUT_PULLUP_NOST, 0) /* (AA3) MMC0_DAT2 */
+			AM62AX_IOPAD(0x208, PIN_INPUT_PULLUP_NOST, 0) /* (Y4) MMC0_DAT3 */
+			AM62AX_IOPAD(0x204, PIN_INPUT_PULLUP_NOST, 0) /* (AB2) MMC0_DAT4 */
+			AM62AX_IOPAD(0x200, PIN_INPUT_PULLUP_NOST, 0) /* (AC1) MMC0_DAT5 */
+			AM62AX_IOPAD(0x1fc, PIN_INPUT_PULLUP_NOST, 0) /* (AD2) MMC0_DAT6 */
+			AM62AX_IOPAD(0x1f8, PIN_INPUT_PULLUP_NOST, 0) /* (AC2) MMC0_DAT7 */
 		>;
 		bootph-all;
 	};
 
 	main_mmc1_pins_default: main-mmc1-default-pins {
 		pinctrl-single,pins = <
-			AM62AX_IOPAD(0x23c, PIN_INPUT, 0) /* (A21) MMC1_CMD */
-			AM62AX_IOPAD(0x234, PIN_INPUT, 0) /* (B22) MMC1_CLK */
-			AM62AX_IOPAD(0x230, PIN_INPUT, 0) /* (A22) MMC1_DAT0 */
-			AM62AX_IOPAD(0x22c, PIN_INPUT, 0) /* (B21) MMC1_DAT1 */
-			AM62AX_IOPAD(0x228, PIN_INPUT, 0) /* (C21) MMC1_DAT2 */
-			AM62AX_IOPAD(0x224, PIN_INPUT, 0) /* (D22) MMC1_DAT3 */
-			AM62AX_IOPAD(0x240, PIN_INPUT, 0) /* (D17) MMC1_SDCD */
+			AM62AX_IOPAD(0x23c, PIN_INPUT_NOST, 0) /* (A21) MMC1_CMD */
+			AM62AX_IOPAD(0x234, PIN_INPUT_NOST, 0) /* (B22) MMC1_CLK */
+			AM62AX_IOPAD(0x230, PIN_INPUT_NOST, 0) /* (A22) MMC1_DAT0 */
+			AM62AX_IOPAD(0x22c, PIN_INPUT_NOST, 0) /* (B21) MMC1_DAT1 */
+			AM62AX_IOPAD(0x228, PIN_INPUT_NOST, 0) /* (C21) MMC1_DAT2 */
+			AM62AX_IOPAD(0x224, PIN_INPUT_NOST, 0) /* (D22) MMC1_DAT3 */
+			AM62AX_IOPAD(0x240, PIN_INPUT_NOST, 0) /* (D17) MMC1_SDCD */
 		>;
 		bootph-all;
 	};

---
base-commit: 6cd6c12031130a349a098dbeb19d8c3070d2dfbe
change-id: 20260106-topic-am62a-mmc-pinctrl-v6-19-next-2f3e5563fbb5

Best regards,
-- 
Markus Schneider-Pargmann (TI.com) <msp@...libre.com>