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Subject[PATCH 6/7] net: rfkill: gpio: add clock-frequency device tree property
Date
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@csie.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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