From: Ray Liu <ray.xy.liu@gmail.com>
Date: Fri, 2 Jan 2026 13:25:00 +0000 (+0800)
Subject: arm: dts: an7581: set r_smpl for MMC in U-Boot
X-Git-Tag: v2026.04-rc1~39
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7cb79f8d3d55aaadff5b131aaf29aa176828a57b;p=thirdparty%2Fu-boot.git

arm: dts: an7581: set r_smpl for MMC in U-Boot

When booting from SPI, the ROM code does not initialize the MMC
controller on AN7581. As a result, the first MMC initialization
is performed by U-Boot.

In this case, the r_smpl bit is left uninitialized, which may
cause incorrect sampling timing during early MMC access.

Set the r_smpl bit explicitly in the U-Boot device tree to ensure
reliable MMC initialization.

This change is limited to the U-Boot-specific device tree.
The Linux MMC driver already performs runtime delay detection
and does not require a fixed r_smpl setting.

Signed-off-by: Ray Liu <ray.xy.liu@gmail.com>
---

diff --git a/arch/arm/dts/an7581-u-boot.dtsi b/arch/arm/dts/an7581-u-boot.dtsi
index a9297ca6503..7fc71d471c4 100644
--- a/arch/arm/dts/an7581-u-boot.dtsi
+++ b/arch/arm/dts/an7581-u-boot.dtsi
@@ -84,6 +84,7 @@
 			reg = <0x0 0x1fa0e000 0x0 0x1000>,
 				<0x0 0x1fa0c000 0x0 0x60>;
 			interrupts = <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>;
+			r_smpl = <1>;
 			clocks = <&scuclk EN7581_CLK_EMMC>, <&clk25m>;
 			clock-names = "source", "hclk";
 			bus-width = <4>;