diff options
| author | Judith Mendez <jm@ti.com> | 2026-02-24 02:37:29 +0300 |
|---|---|---|
| committer | Vignesh Raghavendra <vigneshr@ti.com> | 2026-03-27 05:08:35 +0300 |
| commit | 6d4441be969bea89bb9702781f5dfb3a8f2a02a4 (patch) | |
| tree | e8598ce83173ec374848282e72ef2891f94306f4 | |
| parent | 8cb06da086ae530de7eaf4f44e33e46fa4e78c53 (diff) | |
| download | linux-6d4441be969bea89bb9702781f5dfb3a8f2a02a4.tar.xz | |
arm64: dts: ti: k3-am62p5-sk: Disable MMC1 internal pulls on data pins
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: c00504ea42c0 ("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>
| -rw-r--r-- | arch/arm64/boot/dts/ti/k3-am62p5-sk.dts | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/arm64/boot/dts/ti/k3-am62p5-sk.dts b/arch/arm64/boot/dts/ti/k3-am62p5-sk.dts index fd323a648809..b770ed82be9d 100644 --- a/arch/arm64/boot/dts/ti/k3-am62p5-sk.dts +++ b/arch/arm64/boot/dts/ti/k3-am62p5-sk.dts @@ -271,9 +271,9 @@ 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; |