[PATCH 2/2] ARM: sunxi: chip: Add Wifi chip

[Maxime Ripard]

The CHIP has a WiFi/BT chip on an SDIO bus. That controller is maintained
in reset through a GPIO and uses two independent regulators to be powered
that must be kept in sync.

Model this using an MMC power sequence and a coupled voltage regulator.

Signed-off-by: Maxime Ripard <maxime.rip...@free-electrons.com>
---
 arch/arm/boot/dts/sun5i-r8-chip.dts | 44 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 43 insertions(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/sun5i-r8-chip.dts 
b/arch/arm/boot/dts/sun5i-r8-chip.dts
index 530ab28e9ca2..b5ef4eb5b6b4 100644
--- a/arch/arm/boot/dts/sun5i-r8-chip.dts
+++ b/arch/arm/boot/dts/sun5i-r8-chip.dts
@@ -64,6 +64,24 @@
        chosen {
                stdout-path = "serial0:115200n8";
        };
+
+       mmc0_pwrseq: mmc0_pwrseq {
+               compatible = "mmc-pwrseq-simple";
+               pinctrl-names = "default";
+               pinctrl-0 = <&chip_wifi_reg_on_pin>;
+               reset-gpios = <&pio 2 19 GPIO_ACTIVE_LOW>; /* PC19 */
+       };
+
+       /*
+        * Both LDO3 and LDO4 are used in parallel to power up the
+        * WiFi/BT Chip.
+        */
+       vcc_wifi: wifi_reg {
+               compatible = "coupled-voltage-regulator";
+               regulator-name = "vcc-wifi";
+               vin0-supply = <&reg_ldo3>;
+               vin1-supply = <&reg_ldo4>;
+       };
 };
 
 &codec {
@@ -113,10 +131,15 @@
        };
 };
 
+&mmc0_pins_a {
+       allwinner,pull = <SUN4I_PINCTRL_PULL_UP>;
+};
+
 &mmc0 {
        pinctrl-names = "default";
        pinctrl-0 = <&mmc0_pins_a>;
-       vmmc-supply = <&reg_vcc3v3>;
+       vmmc-supply = <&vcc_wifi>;
+       mmc-pwrseq = <&mmc0_pwrseq>;
        bus-width = <4>;
        non-removable;
        status = "okay";
@@ -138,6 +161,13 @@
                allwinner,pull = <SUN4I_PINCTRL_NO_PULL>;
        };
 
+       chip_wifi_reg_on_pin: chip_wifi_reg_on_pin@0 {
+               allwinner,pins = "PC19";
+               allwinner,function = "gpio_out";
+               allwinner,drive = <SUN4I_PINCTRL_10_MA>;
+               allwinner,pull = <SUN4I_PINCTRL_NO_PULL>;
+       };
+
        chip_id_det_pin: chip_id_det_pin@0 {
                allwinner,pins = "PG2";
                allwinner,function = "gpio_in";
@@ -171,6 +201,18 @@
        regulator-always-on;
 };
 
+&reg_ldo3 {
+       regulator-min-microvolt = <3300000>;
+       regulator-max-microvolt = <3300000>;
+       regulator-name = "vcc-wifi-1";
+};
+
+&reg_ldo4 {
+       regulator-min-microvolt = <3300000>;
+       regulator-max-microvolt = <3300000>;
+       regulator-name = "vcc-wifi-2";
+};
+
 &reg_ldo5 {
        regulator-min-microvolt = <1800000>;
        regulator-max-microvolt = <1800000>;
-- 
2.6.3

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