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    Subject[PATCH RFC 5/6] 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 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 | 4 ++++
    2 files changed, 6 insertions(+)

    diff --git a/Documentation/devicetree/bindings/rfkill/rfkill-gpio.txt b/Documentation/devicetree/bindings/rfkill/rfkill-gpio.txt
    index 8a07ea4..8b8db0a 100644
    --- a/Documentation/devicetree/bindings/rfkill/rfkill-gpio.txt
    +++ b/Documentation/devicetree/bindings/rfkill/rfkill-gpio.txt
    @@ -13,6 +13,7 @@ NAME_reset-gpios, or both, must be defined.

    Optional properties:
    - clocks : phandle to clock to enable/disable
    +- clock-frequency : clock rate to set for the given clock

    Example:

    @@ -23,4 +24,5 @@ Example:
    bluetooth_shutdown-gpios = <0>, <&pio 7 18 0>;
    bluetooth_reset-gpios = <&pio 7 24 0>;
    clocks = <&clk_out_a>;
    + clock-frequency = <32678>;
    };
    diff --git a/net/rfkill/rfkill-gpio.c b/net/rfkill/rfkill-gpio.c
    index 48381a8..3092681 100644
    --- a/net/rfkill/rfkill-gpio.c
    +++ b/net/rfkill/rfkill-gpio.c
    @@ -40,6 +40,7 @@ struct rfkill_gpio_data {
    char *reset_name;
    char *shutdown_name;
    struct clk *clk;
    + int clk_frequency;

    bool clk_enabled;
    };
    @@ -92,6 +93,7 @@ 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;
    }
    @@ -138,6 +140,8 @@ static int rfkill_gpio_probe(struct platform_device *pdev)
    snprintf(rfkill->shutdown_name, len + 10, "%s_shutdown", rfkill->name);

    rfkill->clk = devm_clk_get(&pdev->dev, clk_name);
    + if (!IS_ERR(rfkill->clk) && rfkill->clk_frequency > 0)
    + clk_set_rate(rfkill->clk, rfkill->clk_frequency);

    gpio = devm_gpiod_get_index(&pdev->dev, rfkill->reset_name, 0);
    if (!IS_ERR(gpio)) {
    --
    1.8.5.2


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