linux-kernel - [PATCH 6/7] net: rfkill: gpio: add clock-frequency device tree property

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Message-Id: <1397544101-18135-7-git-send-email-wens@csie.org>
Date:	Tue, 15 Apr 2014 14:41:40 +0800
From:	Chen-Yu Tsai <wens@...e.org>
To:	Linus Walleij <linus.walleij@...aro.org>,
	Johannes Berg <johannes@...solutions.net>,
	"John W. Linville" <linville@...driver.com>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:	Chen-Yu Tsai <wens@...e.org>, Arnd Bergmann <arnd@...db.de>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Alexandre Courbot <gnurou@...il.com>,
	Stephen Warren <swarren@...dotorg.org>,
	linux-gpio@...r.kernel.org, linux-wireless@...r.kernel.org,
	netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-sunxi@...glegroups.com
Subject: [PATCH 6/7] net: rfkill: gpio: add clock-frequency device tree property

Some devices, such as Broadcom Bluetooth devices, require a specific
clock rate for the clock tied to the rfkill device. Add a clock-frequency
property so we can specify this from the device tree.

Signed-off-by: Chen-Yu Tsai <wens@...e.org>
---
 Documentation/devicetree/bindings/rfkill/rfkill-gpio.txt | 2 ++
 net/rfkill/rfkill-gpio.c                                 | 5 +++++
 2 files changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/rfkill/rfkill-gpio.txt b/Documentation/devicetree/bindings/rfkill/rfkill-gpio.txt
index a23da65..67b5edb 100644
--- a/Documentation/devicetree/bindings/rfkill/rfkill-gpio.txt
+++ b/Documentation/devicetree/bindings/rfkill/rfkill-gpio.txt
@@ -11,6 +11,7 @@ Required properties:
 
 Optional properties:
 - clocks		: phandle to clock to enable/disable
+- clock-frequency	: desired clock rate for the given clock
 
 Example:
 
@@ -21,4 +22,5 @@ Example:
 		gpios = <&pio 7 18 0>;
 		gpio-names = "reset";
 		clocks = <&clk_out_a>;
+		clock-frequency = <32678>;
 	};
diff --git a/net/rfkill/rfkill-gpio.c b/net/rfkill/rfkill-gpio.c
index a174359..14ac8c1 100644
--- a/net/rfkill/rfkill-gpio.c
+++ b/net/rfkill/rfkill-gpio.c
@@ -38,6 +38,7 @@ struct rfkill_gpio_data {
 
 	struct rfkill		*rfkill_dev;
 	struct clk		*clk;
+	uint32_t		clk_frequency;
 
 	bool			clk_enabled;
 };
@@ -90,6 +91,7 @@ static int rfkill_gpio_dt_probe(struct device *dev,
 	rfkill->name = np->name;
 	of_property_read_string(np, "rfkill-name", &rfkill->name);
 	of_property_read_u32(np, "rfkill-type", &rfkill->type);
+	of_property_read_u32(np, "clock-frequency", &rfkill->clk_frequency);
 
 	return 0;
 }
@@ -122,6 +124,9 @@ static int rfkill_gpio_probe(struct platform_device *pdev)
 
 	rfkill->clk = devm_clk_get(&pdev->dev, NULL);
 
+	if (!IS_ERR(rfkill->clk) && rfkill->clk_frequency > 0)
+		clk_set_rate(rfkill->clk, rfkill->clk_frequency);
+
 	gpio = devm_gpiod_get_index(&pdev->dev, "reset", 0);
 	if (!IS_ERR(gpio)) {
 		ret = gpiod_direction_output(gpio, 0);
-- 
1.9.1

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