arm64: dts: rockchip: Fix microSD in rk3399 sapphire board

The microSD card slot in the Sapphire board is not working because of
several issues:
 1.- The vmmc power supply is missing in the DTS. It is capable of 3.0V
 and has a GPIO-based enable control.
 2.- The vqmmc power supply can provide up to 3.3V, but it is capped in
 the DTS to just 3.0V because of the vmmc capability. This results in a
 conflict from the mmc driver requesting an unsupportable voltage range
 from 3.3V to 3.0V (min > max) as reported in dmesg. So, extend the
 range up to 3.3V. The hw should be able to stand this 0.3V tolerance.
 See mmc_regulator_set_vqmmc in drivers/mmc/core/core.c.
 3.- The card detect signal is non-working. There is a known conflict
 with jtag, but the workaround in drivers/soc/rockchip/grf.c does not
 work. Adding the broken-cd attribute to the DTS fixes the issue.

Signed-off-by: Vicente Bergas <vicencb@gmail.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

1 files changed, 23 insertions, 1 deletions

diff --git a/arch/arm64/boot/dts/rockchip/rk3399-sapphire.dtsi b/arch/arm64/boot/dts/rockchip/rk3399-sapphire.dtsi
index a531cd6c2e83..5421e23760c3 100644
--- a/arch/arm64/boot/dts/rockchip/rk3399-sapphire.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3399-sapphire.dtsi
@@ -93,6 +93,19 @@
                 vin-supply = <&vcc_1v8>;
         };
 
+        vcc3v0_sd: vcc3v0-sd {
+                compatible = "regulator-fixed";
+                enable-active-high;
+                gpio = <&gpio0 RK_PA1 GPIO_ACTIVE_HIGH>;
+                pinctrl-names = "default";
+                pinctrl-0 = <&sdmmc0_pwr_h>;
+                regulator-always-on;
+                regulator-max-microvolt = <3000000>;
+                regulator-min-microvolt = <3000000>;
+                regulator-name = "vcc3v0_sd";
+                vin-supply = <&vcc3v3_sys>;
+        };
+
         vcc3v3_sys: vcc3v3-sys {
                 compatible = "regulator-fixed";
                 regulator-name = "vcc3v3_sys";
@@ -320,7 +333,7 @@
                                 regulator-always-on;
                                 regulator-boot-on;
                                 regulator-min-microvolt = <1800000>;
-                                regulator-max-microvolt = <3000000>;
+                                regulator-max-microvolt = <3300000>;
                                 regulator-state-mem {
                                         regulator-on-in-suspend;
                                         regulator-suspend-microvolt = <3000000>;
@@ -474,6 +487,13 @@
                 };
         };
 
+        sd {
+                sdmmc0_pwr_h: sdmmc0-pwr-h {
+                        rockchip,pins =
+                                <RK_GPIO0 RK_PA1 RK_FUNC_GPIO &pcfg_pull_none>;
+                };
+        };
+
         usb2 {
                 vcc5v0_host_en: vcc5v0-host-en {
                         rockchip,pins =
@@ -508,6 +528,7 @@
 };
 
 &sdmmc {
+        broken-cd;
         bus-width = <4>;
         cap-mmc-highspeed;
         cap-sd-highspeed;
@@ -516,6 +537,7 @@
         max-frequency = <150000000>;
         pinctrl-names = "default";
         pinctrl-0 = <&sdmmc_clk &sdmmc_cmd &sdmmc_cd &sdmmc_bus4>;
+        vmmc-supply = <&vcc3v0_sd>;
         vqmmc-supply = <&vcc_sdio>;
         status = "okay";
 };