lkml.org 
[lkml]   [2018]   [May]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v2 5/5] arm64: dts: rockchip: Add sdmmc UHS support for roc-rk3328-cc
Date
From: Levin Du <djw@t-chip.com.cn>

In roc-rk3328-cc board, the signal voltage of sdmmc is supplied by
the vcc_sdio regulator, which is a mux between 1.8V and 3.3V,
controlled by a special output only gpio pin labeled
"gpiomut_pmuio_iout", corresponding bit 1 of the syscon GRF_SOC_CON10.

This special pin can now be reference as <&gpio_mute 1>, thanks
to the gpio-syscon driver, which makes writing regulator-gpio possible.

If the signal voltage changes, the io domain needs to change
correspondingly.

To use this feature, the following options are required in kernel config:
- CONFIG_GPIO_SYSCON=y
- CONFIG_POWER_AVS=y
- CONFIG_ROCKCHIP_IODOMAIN=y

Signed-off-by: Levin Du <djw@t-chip.com.cn>

---

Changes in v2:
- Rename gpio_syscon10 to gpio_mute in rk3328-roc-cc.dts

Changes in v1:
- Split into small patches
- Sort dts properties in sdmmc node

arch/arm64/boot/dts/rockchip/rk3328-roc-cc.dts | 20 +++++++++++++++++++-
1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/rockchip/rk3328-roc-cc.dts b/arch/arm64/boot/dts/rockchip/rk3328-roc-cc.dts
index b983abd..e3162bb 100644
--- a/arch/arm64/boot/dts/rockchip/rk3328-roc-cc.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3328-roc-cc.dts
@@ -41,6 +41,19 @@
vin-supply = <&vcc_io>;
};

+ vcc_sdio: sdmmcio-regulator {
+ compatible = "regulator-gpio";
+ gpios = <&gpio_mute 1 GPIO_ACTIVE_HIGH>;
+ states = <1800000 0x1
+ 3300000 0x0>;
+ regulator-name = "vcc_sdio";
+ regulator-type = "voltage";
+ regulator-min-microvolt = <1800000>;
+ regulator-max-microvolt = <3300000>;
+ regulator-always-on;
+ vin-supply = <&vcc_sys>;
+ };
+
vcc_host1_5v: vcc_otg_5v: vcc-host1-5v-regulator {
compatible = "regulator-fixed";
enable-active-high;
@@ -213,7 +226,7 @@

vccio1-supply = <&vcc_io>;
vccio2-supply = <&vcc18_emmc>;
- vccio3-supply = <&vcc_io>;
+ vccio3-supply = <&vcc_sdio>;
vccio4-supply = <&vcc_18>;
vccio5-supply = <&vcc_io>;
vccio6-supply = <&vcc_io>;
@@ -242,7 +255,12 @@
max-frequency = <150000000>;
pinctrl-names = "default";
pinctrl-0 = <&sdmmc0_clk &sdmmc0_cmd &sdmmc0_dectn &sdmmc0_bus4>;
+ sd-uhs-sdr12;
+ sd-uhs-sdr25;
+ sd-uhs-sdr50;
+ sd-uhs-sdr104;
vmmc-supply = <&vcc_sd>;
+ vqmmc-supply = <&vcc_sdio>;
status = "okay";
};

--
2.7.4

\
 
 \ /
  Last update: 2018-05-18 05:53    [W:0.106 / U:1.964 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site