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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>
This commit is contained in:
Wadim Egorov 2016-01-21 13:57:13 +01:00 committed by Heiko Stuebner
parent b662f6d03a
commit 296759c91e
1 changed files with 24 additions and 0 deletions
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24
arch/arm/boot/dts/rk3288-firefly.dtsi
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@ -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>;
};