All of mmc controllers include SDMMC, SDIO0, SDIO1, and EMMC on RK3288
are limited to 150Mhz. It was mainly caused by two reasons:
- RK3288's IO pad(except DDR IO pad) is generic, which can only support
the max of 150Mhz.
- Mmc controller was designed at 150Mhz, and the pressure test by IC team
was based on this freequency point.
Signed-off-by: Addy Ke <addy...@rock-chips.com>
---
arch/arm/boot/dts/rk3288.dtsi | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/arch/arm/boot/dts/rk3288.dtsi b/arch/arm/boot/dts/rk3288.dtsi
index acb6a2f..9c35a1d 100644
--- a/arch/arm/boot/dts/rk3288.dtsi
+++ b/arch/arm/boot/dts/rk3288.dtsi
@@ -149,6 +149,7 @@
sdmmc: dwmmc@ff0c0000 {
compatible = "rockchip,rk3288-dw-mshc";
+ clock-freq-min-max = <400000 150000000>;
clocks = <&cru HCLK_SDMMC>, <&cru SCLK_SDMMC>;
clock-names = "biu", "ciu";
fifo-depth = <0x100>;
@@ -159,6 +160,7 @@
sdio0: dwmmc@ff0d0000 {
compatible = "rockchip,rk3288-dw-mshc";
+ clock-freq-min-max = <400000 150000000>;
clocks = <&cru HCLK_SDIO0>, <&cru SCLK_SDIO0>;
clock-names = "biu", "ciu";
fifo-depth = <0x100>;
@@ -169,6 +171,7 @@
sdio1: dwmmc@ff0e0000 {
compatible = "rockchip,rk3288-dw-mshc";
+ clock-freq-min-max = <400000 150000000>;
clocks = <&cru HCLK_SDIO1>, <&cru SCLK_SDIO1>;
clock-names = "biu", "ciu";
fifo-depth = <0x100>;
@@ -179,6 +182,7 @@
emmc: dwmmc@ff0f0000 {
compatible = "rockchip,rk3288-dw-mshc";
+ clock-freq-min-max = <400000 150000000>;
clocks = <&cru HCLK_EMMC>, <&cru SCLK_EMMC>;
clock-names = "biu", "ciu";
fifo-depth = <0x100>;
--
1.8.3.2
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