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arm64: dts: ti: k3-am62p5-sk: Disable MMC1 internal pulls on data pins

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AM62P SK has external 10K pullups on MMC1 DAT1-DAT3 pins [0].
Disable internal pullups on DAT1-DAT3 so that each line has a
single pullup source:
- with both pullups enabled, the effective parallel resistance on
  DAT1-3 (~8.33K) drops below the 10K minimum pullup requirement
  for data lines (per SD Physical Layer Specification)
- removing internal pullups makes DAT1-3 match DAT0 10K
  external pullup so its consistent and within spec
- both internal and external pullups enabled equals unnecessary power
  consumption

[0] https://www.ti.com/lit/zip/SPRR487

Fixes: c00504ea42 ("arm64: dts: ti: k3-am62p5-sk: Updates for SK EVM")
Signed-off-by: Judith Mendez <jm@ti.com>
Reviewed-by: Moteen Shah <m-shah@ti.com>
Link: https://patch.msgid.link/20260223233731.2690472-2-jm@ti.com
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
This commit is contained in:
Judith Mendez 2026-02-23 17:37:29 -06:00 committed by Vignesh Raghavendra
parent 8cb06da086
commit 6d4441be96
1 changed files with 3 additions and 3 deletions
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6
arch/arm64/boot/dts/ti/k3-am62p5-sk.dts
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@ -271,9 +271,9 @@ main_mmc1_pins_default: main-mmc1-default-pins {
AM62PX_IOPAD(0x023c, PIN_INPUT, 0) /* (H20) MMC1_CMD */
AM62PX_IOPAD(0x0234, PIN_OUTPUT, 0) /* (J24) MMC1_CLK */
AM62PX_IOPAD(0x0230, PIN_INPUT, 0) /* (H21) MMC1_DAT0 */
AM62PX_IOPAD(0x022c, PIN_INPUT_PULLUP, 0) /* (H23) MMC1_DAT1 */
AM62PX_IOPAD(0x0228, PIN_INPUT_PULLUP, 0) /* (H22) MMC1_DAT2 */
AM62PX_IOPAD(0x0224, PIN_INPUT_PULLUP, 0) /* (H25) MMC1_DAT3 */
AM62PX_IOPAD(0x022c, PIN_INPUT, 0) /* (H23) MMC1_DAT1 */
AM62PX_IOPAD(0x0228, PIN_INPUT, 0) /* (H22) MMC1_DAT2 */
AM62PX_IOPAD(0x0224, PIN_INPUT, 0) /* (H25) MMC1_DAT3 */
AM62PX_IOPAD(0x0240, PIN_INPUT, 0) /* (D23) MMC1_SDCD */
>;
bootph-all;