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authorJavier Martinez Canillas <javier.martinez@collabora.co.uk>2015-02-04 18:22:02 +0300
committerKukjin Kim <kgene@kernel.org>2015-02-26 22:44:53 +0300
commitb07a27696bda1d23036b3b018bfd799f93f4e8f0 (patch)
treedb38cfb02c2a9419634da1c6384d0a03c12e4275 /arch/arm/boot/dts/exynos5250-snow.dts
parentc517d838eb7d07bbe9507871fab3931deccff539 (diff)
downloadlinux-b07a27696bda1d23036b3b018bfd799f93f4e8f0.tar.xz
ARM: dts: Enable wifi power-on for exynos5250-snow
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>
Diffstat (limited to 'arch/arm/boot/dts/exynos5250-snow.dts')
-rw-r--r--arch/arm/boot/dts/exynos5250-snow.dts25
1 files changed, 24 insertions, 1 deletions
diff --git a/arch/arm/boot/dts/exynos5250-snow.dts b/arch/arm/boot/dts/exynos5250-snow.dts
index b9aeec430527..b78712058903 100644
--- a/arch/arm/boot/dts/exynos5250-snow.dts
+++ b/arch/arm/boot/dts/exynos5250-snow.dts
@@ -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>;