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ARM: dts: Enable wifi power-on for exynos5250-snow

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The Snow board has a MMC/SDIO wifi chip that is always powered but it
needs a power sequence involving a reset (active low) and an enable
(active high) pins. Both pins are marked as active low since the MMC
simple power sequence driver asserts the pins prior to the card power
up procedure and de-asserts the pins after the card has been powered.

So the reset line will be left de-asserted and the enable pin will be
left asserted.

The chip also needs an external 32kHz reference clock to be operational
that is by the MAX77686 PMIC clock.

Add a simple MMC power sequence provider for the wifi MMC/SDIO slot.

Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Signed-off-by: Kukjin Kim <kgene@kernel.org>
This commit is contained in:
Javier Martinez Canillas 2015-02-05 00:22:02 +09:00 committed by Kukjin Kim
parent c517d838eb
commit b07a27696b
1 changed files with 24 additions and 1 deletions
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25
arch/arm/boot/dts/exynos5250-snow.dts
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@ -229,6 +229,14 @@
power-supply = <&fet6>;
backlight = <&backlight>;
};
mmc3_pwrseq: mmc3_pwrseq {
compatible = "mmc-pwrseq-simple";
reset-gpios = <&gpx0 2 GPIO_ACTIVE_LOW>, /* WIFI_RSTn */
<&gpx0 1 GPIO_ACTIVE_LOW>; /* WIFI_EN */
clocks = <&max77686 MAX77686_CLK_PMIC>;
clock-names = "ext_clock";
};
};
&dp {
@ -536,12 +544,27 @@
samsung,dw-mshc-sdr-timing = <2 3>;
samsung,dw-mshc-ddr-timing = <1 2>;
pinctrl-names = "default";
pinctrl-0 = <&sd3_clk &sd3_cmd &sd3_bus4>;
pinctrl-0 = <&sd3_clk &sd3_cmd &sd3_bus4 &wifi_en &wifi_rst>;
bus-width = <4>;
cap-sd-highspeed;
mmc-pwrseq = <&mmc3_pwrseq>;
};
&pinctrl_0 {
wifi_en: wifi-en {
samsung,pins = "gpx0-1";
samsung,pin-function = <1>;
samsung,pin-pud = <0>;
samsung,pin-drv = <0>;
};
wifi_rst: wifi-rst {
samsung,pins = "gpx0-2";
samsung,pin-function = <1>;
samsung,pin-pud = <0>;
samsung,pin-drv = <0>;
};
power_key_irq: power-key-irq {
samsung,pins = "gpx1-3";
samsung,pin-function = <0xf>;