arm64: dts: ti: k3-am654-base-board: Add support for SD card

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 <faiz_abbas@ti.com>
Signed-off-by: Tero Kristo <t-kristo@ti.com>

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 2f3d3316a1cfe23db9e93b2dfa88077d591fd666..b40153b4b4008d1139fa09f6cca5a07e2f6f04f1 100644 (file)
--- 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 */
@@ -300,6 +313,18 @@
        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";
 };