[PATCH v2 5/6] ARM: dts: exynos5250-snow: Enable wifi power-on

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



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@xxxxxxxxxxxxxxx>
---

Changes since v1:
 - Remove cap-sdio-irq from mmc3 dev node since is a separate change.
   Suggested by Arend van Spriel.
---
 arch/arm/boot/dts/exynos5250-snow.dts | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

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>;
-- 
2.1.3

--
To unsubscribe from this list: send the line "unsubscribe linux-mmc" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html




[Index of Archives]     [Linux USB Devel]     [Linux Media]     [Video for Linux]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]

  Powered by Linux