Commit ee2a9d9c authored by Judith Mendez's avatar Judith Mendez Committed by Vignesh Raghavendra
Browse files

arm64: dts: ti: k3-am62-lp-sk: Enable internal pulls for MMC0 data pins 

AM62 LP SK board does not have external pullups on MMC0 DAT1-DAT7
pins [0]. Enable internal pullups on DAT1-DAT7 considering:
- without a host-side pullup, these lines rely solely on the eMMC
  device's internal pullup (R_int, 10-150K per JEDEC), which may
  exceed the recommended 50K max for 1.8V VCCQ
- JEDEC JESD84-B51 Table 200 requires host-side pullups (R_DAT,
  10K-100K) on all data lines to prevent bus floating

[0] https://www.ti.com/lit/zip/SPRR471



Fixes: a0b8da04 ("arm64: dts: ti: k3-am62*: Move eMMC pinmux to top level board file")
Signed-off-by: default avatarJudith Mendez <jm@ti.com>
Reviewed-by: default avatarMoteen Shah <m-shah@ti.com>
Link: https://patch.msgid.link/20260223233731.2690472-4-jm@ti.com


Signed-off-by: default avatarVignesh Raghavendra <vigneshr@ti.com>
parent 02532ba5

arch/arm64/boot/dts/ti/k3-am62-lp-sk.dts

+7 −7
Original line number Diff line number Diff line
@@ -88,13 +88,13 @@ main_mmc0_pins_default: main-mmc0-default-pins { 
			AM62X_IOPAD(0x220, PIN_INPUT, 0) /* (V3) MMC0_CMD */

			AM62X_IOPAD(0x218, PIN_INPUT, 0) /* (Y1) MMC0_CLK */

			AM62X_IOPAD(0x214, PIN_INPUT, 0) /* (V2) MMC0_DAT0 */

			AM62X_IOPAD(0x210, PIN_INPUT, 0) /* (V1) MMC0_DAT1 */

			AM62X_IOPAD(0x20c, PIN_INPUT, 0) /* (W2) MMC0_DAT2 */

			AM62X_IOPAD(0x208, PIN_INPUT, 0) /* (W1) MMC0_DAT3 */

			AM62X_IOPAD(0x204, PIN_INPUT, 0) /* (Y2) MMC0_DAT4 */

			AM62X_IOPAD(0x200, PIN_INPUT, 0) /* (W3) MMC0_DAT5 */

			AM62X_IOPAD(0x1fc, PIN_INPUT, 0) /* (W4) MMC0_DAT6 */

			AM62X_IOPAD(0x1f8, PIN_INPUT, 0) /* (V4) MMC0_DAT7 */

			AM62X_IOPAD(0x210, PIN_INPUT_PULLUP, 0) /* (V1) MMC0_DAT1 */

			AM62X_IOPAD(0x20c, PIN_INPUT_PULLUP, 0) /* (W2) MMC0_DAT2 */

			AM62X_IOPAD(0x208, PIN_INPUT_PULLUP, 0) /* (W1) MMC0_DAT3 */

			AM62X_IOPAD(0x204, PIN_INPUT_PULLUP, 0) /* (Y2) MMC0_DAT4 */

			AM62X_IOPAD(0x200, PIN_INPUT_PULLUP, 0) /* (W3) MMC0_DAT5 */

			AM62X_IOPAD(0x1fc, PIN_INPUT_PULLUP, 0) /* (W4) MMC0_DAT6 */

			AM62X_IOPAD(0x1f8, PIN_INPUT_PULLUP, 0) /* (V4) MMC0_DAT7 */

		>;

	};