Lubancat2/kernel
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

dt-bindings: rockchip-dw-mshc: Add pinctrl note

Browse Source 
Add pinctrl description and example to show how it was used
to prevent power leak for SD/MMC cards.

Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Change-Id: I1b711328e4677e74b82c74a9bedbc052f5ea9b97
This commit is contained in:
Shawn Lin
2023-06-02 11:42:48 +08:00
parent 57be356445
commit c2b5d8108f
1 changed files with 33 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

33
Documentation/devicetree/bindings/mmc/rockchip-dw-mshc.txt
View File

@ -38,6 +38,12 @@ Optional Properties:
execute tuning when needed. If not specified, the host will do tuning
for 360 times, namely tuning for each degree.
* pinctrl-names: should be "default" or "normal" combined with "idle". For
SDIO or eMMC devices, recommend to use "default". For SD/MMC cards, recommend
to use "normal" combined with "idle" to prevent power leak if vqmmc can't be
powered off. "normal" state is the same as "default" state, but "idle" state
should define the clk/cmd/data line to be pulled down or pulled none.
Example:
rkdwmmc0@12200000 {
@ -47,3 +53,30 @@ Example:
#address-cells = <1>;
#size-cells = <0>;
};
/* "default" pinctrl */
&rkdwmmc0{
...
pinctrl-names = "default"
pinctrl-0 = <&sdmmc0_clk &sdmmc0_cmd &sdmmc0_det &sdmmc0_bus4>;
...
};
/* "normal" combined with "idle" pinctrl */
sdmmc_idle_gpios: sdmmc-idle-gpios {
rockchip,pins =
<3 RK_PA2 RK_FUNC_GPIO &pcfg_pull_none>,
<3 RK_PA3 RK_FUNC_GPIO &pcfg_pull_none>,
<3 RK_PA4 RK_FUNC_GPIO &pcfg_pull_none>,
<3 RK_PA5 RK_FUNC_GPIO &pcfg_pull_none>,
<3 RK_PA6 RK_FUNC_GPIO &pcfg_pull_none>,
<3 RK_PA7 RK_FUNC_GPIO &pcfg_pull_none>;
};
&rkdwmmc0{
...
pinctrl-names = "normal", "idle";
pinctrl-0 = <&sdmmc0_clk &sdmmc0_cmd &sdmmc0_det &sdmmc0_bus4>;
pinctrl-1 = <&sdmmc_idle_gpios &sdmmc0_det>;
...
}