[2/2] arm64: dts: ti: k3-am654-base-board: Add support for SD card

Commit Message

Faiz Abbas July 10, 2020, 7:02 p.m. UTC

With silicon revision 2.0, add support for SD card on the am65x-evm.
Boards with silicon revision 1.0 are susceptible to interface issues
because of erratas i2025 and i2026[1] and are recommended to disable
this node.

[1] Am654x Silicon Revision 1.0 errata: https://www.ti.com/lit/pdf/sprz452

Signed-off-by: Faiz Abbas <[e-mail]>
---
 .../arm64/boot/dts/ti/k3-am654-base-board.dts | 24 +++++++++++++++++++
 1 file changed, 24 insertions(+)

Patch

diff --git a/arch/arm64/boot/dts/ti/k3-am654-base-board.dts b/arch/arm64/boot/dts/ti/k3-am654-base-board.dts
index 9fc7898a6a3b..84aeb4761ac0 100644
--- a/arch/arm64/boot/dts/ti/k3-am654-base-board.dts
+++ b/arch/arm64/boot/dts/ti/k3-am654-base-board.dts
@@ -167,6 +167,19 @@ 
 		>;
 	};
 
+	main_mmc1_pins_default: main_mmc1_pins_default {
+		pinctrl-single,pins = <
+			AM65X_IOPAD(0x02d4, PIN_INPUT_PULLDOWN, 0) /* (C27) MMC1_CLK */
+			AM65X_IOPAD(0x02d8, PIN_INPUT_PULLUP, 0) /* (C28) MMC1_CMD */
+			AM65X_IOPAD(0x02d0, PIN_INPUT_PULLUP, 0) /* (D28) MMC1_DAT0 */
+			AM65X_IOPAD(0x02cc, PIN_INPUT_PULLUP, 0) /* (E27) MMC1_DAT1 */
+			AM65X_IOPAD(0x02c8, PIN_INPUT_PULLUP, 0) /* (D26) MMC1_DAT2 */
+			AM65X_IOPAD(0x02c4, PIN_INPUT_PULLUP, 0) /* (D27) MMC1_DAT3 */
+			AM65X_IOPAD(0x02dc, PIN_INPUT_PULLUP, 0) /* (B24) MMC1_SDCD */
+			AM65X_IOPAD(0x02e0, PIN_INPUT, 0) /* (C24) MMC1_SDWP */
+		>;
+	};
+
 	usb1_pins_default: usb1_pins_default {
 		pinctrl-single,pins = <
 			AM65X_IOPAD(0x02c0, PIN_OUTPUT, 0) /* (AC8) USB1_DRVVBUS */
@@ -299,6 +312,17 @@ 
 	ti,driver-strength-ohm = <50>;
 	disable-wp;
 };
+/*
+ * Because of erratas i2025 and i2026 for silicon revision 1.0, the
+ * SD card interface might fail. Boards with sr1.0 are recommended to
+ * disable sdhci1
+ */
+&sdhci1 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&main_mmc1_pins_default>;
+	ti,driver-strength-ohm = <50>;
+	disable-wp;
+};
 
 &dwc3_1 {
 	status = "okay";