LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
To: Ulf Hansson <ulf.hansson@linaro.org>
Cc: Kukjin Kim <kgene@kernel.org>,
	Doug Anderson <dianders@chromium.org>,
	Olof Johansson <olof@lixom.net>,
	Arend van Spriel <arend@broadcom.com>,
	Srinivas Kandagatla <srinivas.kandagatla@linaro.org>,
	linux-samsung-soc@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, linux-mmc@vger.kernel.org,
	devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
	Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Subject: [PATCH v3 5/6] ARM: dts: exynos5250-snow: Enable wifi power-on
Date: Thu, 29 Jan 2015 16:00:07 +0100	[thread overview]
Message-ID: <1422543608-24704-6-git-send-email-javier.martinez@collabora.co.uk> (raw)
In-Reply-To: <1422543608-24704-1-git-send-email-javier.martinez@collabora.co.uk>

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>
---

Changes since v2: None.

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


  parent reply	other threads:[~2015-01-29 15:00 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-01-29 15:00 [PATCH v3 0/6] Add multiple GPIO and external clock to MMC pwrseq_simple Javier Martinez Canillas
2015-01-29 15:00 ` [PATCH v3 1/6] mmc: pwrseq: Document that simple sequence support more than one GPIO Javier Martinez Canillas
2015-01-29 15:00 ` [PATCH v3 2/6] mmc: pwrseq_simple: Extend to support more pins Javier Martinez Canillas
2015-01-29 15:00 ` [PATCH v3 3/6] mmc: pwrseq: Document optional clock for the simple power sequence Javier Martinez Canillas
2015-01-29 15:00 ` [PATCH v3 4/6] mmc: pwrseq_simple: Add optional reference clock support Javier Martinez Canillas
2015-01-30 11:17   ` Ulf Hansson
2015-01-30 13:03     ` Javier Martinez Canillas
2015-01-29 15:00 ` Javier Martinez Canillas [this message]
2015-01-29 15:00 ` [PATCH v3 6/6] ARM: dts: exynos5250-snow: Add cap-sdio-irq to wifi mmc node Javier Martinez Canillas
2015-01-30 11:13 ` [PATCH v3 0/6] Add multiple GPIO and external clock to MMC pwrseq_simple Ulf Hansson
2015-01-30 13:06   ` Javier Martinez Canillas
2015-02-04 15:06     ` Javier Martinez Canillas
2015-02-04 15:19       ` Kukjin Kim
2015-02-04 15:22         ` Javier Martinez Canillas

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1422543608-24704-6-git-send-email-javier.martinez@collabora.co.uk \
    --to=javier.martinez@collabora.co.uk \
    --cc=arend@broadcom.com \
    --cc=devicetree@vger.kernel.org \
    --cc=dianders@chromium.org \
    --cc=kgene@kernel.org \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mmc@vger.kernel.org \
    --cc=linux-samsung-soc@vger.kernel.org \
    --cc=olof@lixom.net \
    --cc=srinivas.kandagatla@linaro.org \
    --cc=ulf.hansson@linaro.org \
    --subject='Re: [PATCH v3 5/6] ARM: dts: exynos5250-snow: Enable wifi power-on' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).