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

Maxime Ripard
2015-11-30T15:29:38Z

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.ripard@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