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@xxxxxxxxxxxxxxxxxx> --- 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 = <®_ldo3>; + vin1-supply = <®_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 = <®_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; }; +®_ldo3 { + regulator-min-microvolt = <3300000>; + regulator-max-microvolt = <3300000>; + regulator-name = "vcc-wifi-1"; +}; + +®_ldo4 { + regulator-min-microvolt = <3300000>; + regulator-max-microvolt = <3300000>; + regulator-name = "vcc-wifi-2"; +}; + ®_ldo5 { regulator-min-microvolt = <1800000>; regulator-max-microvolt = <1800000>; -- 2.6.4 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html