ARM: dts: rockchip: Bump sd card pin drive strength up on firefly boards

It seems some firefly boards need 12mA drive strength for sdmmc.
Using 4mA/8mA drive strength will cause the kernel to fail to recognize
the sd card correctly.
Increased the sdmmc lines drive strength from 4mA to 12mA.

Signed-off-by: Wadim Egorov <w.egorov@phytec.de>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

diff --git a/arch/arm/boot/dts/rk3288-firefly.dtsi b/arch/arm/boot/dts/rk3288-firefly.dtsi
index 4e3fd9aefe3497e464bc8fecdb10a688372460a6..49ec20d24082d64b1168769d0d002dd98afc1b92 100644 (file)
--- a/arch/arm/boot/dts/rk3288-firefly.dtsi
+++ b/arch/arm/boot/dts/rk3288-firefly.dtsi
@@ -408,6 +408,11 @@
                output-low;
        };
 
+       pcfg_pull_up_drv_12ma: pcfg-pull-up-drv-12ma {
+               bias-pull-up;
+               drive-strength = <12>;
+       };
+
        act8846 {
                pwr_hold: pwr-hold {
                        rockchip,pins = <0 1 RK_FUNC_GPIO &pcfg_output_high>;
@@ -457,6 +462,25 @@
        };
 
        sdmmc {
+               /*
+                * Default drive strength isn't enough to achieve even
+                * high-speed mode on firefly board so bump up to 12ma.
+                */
+               sdmmc_bus4: sdmmc-bus4 {
+                       rockchip,pins = <6 16 RK_FUNC_1 &pcfg_pull_up_drv_12ma>,
+                                       <6 17 RK_FUNC_1 &pcfg_pull_up_drv_12ma>,
+                                       <6 18 RK_FUNC_1 &pcfg_pull_up_drv_12ma>,
+                                       <6 19 RK_FUNC_1 &pcfg_pull_up_drv_12ma>;
+               };
+
+               sdmmc_clk: sdmmc-clk {
+                       rockchip,pins = <6 20 RK_FUNC_1 &pcfg_pull_none_12ma>;
+               };
+
+               sdmmc_cmd: sdmmc-cmd {
+                       rockchip,pins = <6 21 RK_FUNC_1 &pcfg_pull_up_drv_12ma>;
+               };
+
                sdmmc_pwr: sdmmc-pwr {
                        rockchip,pins = <7 11 RK_FUNC_GPIO &pcfg_pull_none>;
                };