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Date: Mon, 31 Dec 2012 09:23:25 +1300 From: Tony Prisk <linux@...sktech.co.nz> To: Thierry Reding <thierry.reding@...onic-design.de> Cc: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, vt8500-wm8505-linux-kernel@...glegroups.com, Tony Prisk <linux@...sktech.co.nz> Subject: [PATCH 2/2] pwm: vt8500: Add support for .set_polarity Add support to set polarity on pwm devices, allowing for inverted duty cycles. Also update the binding document to #pwm-cells = <3> to allow passing the flags from devicetree. Signed-off-by: Tony Prisk <linux@...sktech.co.nz> --- .../devicetree/bindings/pwm/vt8500-pwm.txt | 7 ++++--- drivers/pwm/pwm-vt8500.c | 21 ++++++++++++++++++++ 2 files changed, 25 insertions(+), 3 deletions(-) diff --git a/Documentation/devicetree/bindings/pwm/vt8500-pwm.txt b/Documentation/devicetree/bindings/pwm/vt8500-pwm.txt index bcc6367..f71cc8d 100644 --- a/Documentation/devicetree/bindings/pwm/vt8500-pwm.txt +++ b/Documentation/devicetree/bindings/pwm/vt8500-pwm.txt @@ -3,14 +3,15 @@ VIA/Wondermedia VT8500/WM8xxx series SoC PWM controller Required properties: - compatible: should be "via,vt8500-pwm" - reg: physical base address and length of the controller's registers -- #pwm-cells: should be 2. The first cell specifies the per-chip index - of the PWM to use and the second cell is the period in nanoseconds. +- #pwm-cells: should be 3. The first cell specifies the per-chip index + of the PWM to use, the second cell is the period in nanoseconds, and the + third cell is for flags. - clocks: phandle to the PWM source clock Example: pwm1: pwm@...20000 { - #pwm-cells = <2>; + #pwm-cells = <3>; compatible = "via,vt8500-pwm"; reg = <0xd8220000 0x1000>; clocks = <&clkpwm>; diff --git a/drivers/pwm/pwm-vt8500.c b/drivers/pwm/pwm-vt8500.c index 27ed0f4..9abf561 100644 --- a/drivers/pwm/pwm-vt8500.c +++ b/drivers/pwm/pwm-vt8500.c @@ -164,10 +164,31 @@ static void vt8500_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm) clk_disable(vt8500->clk); } +static int vt8500_pwm_set_polarity(struct pwm_chip *chip, + struct pwm_device *pwm, + enum pwm_polarity polarity) +{ + struct vt8500_chip *vt8500 = to_vt8500_chip(chip); + u32 val; + + val = readl(vt8500->base + REG_CTRL(pwm->hwpwm)); + + if (polarity == PWM_POLARITY_INVERSED) + val |= CTRL_INVERT; + else + val &= ~CTRL_INVERT; + + writel(val, vt8500->base + REG_CTRL(pwm->hwpwm)); + pwm_busy_wait(vt8500, pwm->hwpwm, STATUS_CTRL_UPDATE); + + return 0; +} + static struct pwm_ops vt8500_pwm_ops = { .enable = vt8500_pwm_enable, .disable = vt8500_pwm_disable, .config = vt8500_pwm_config, + .set_polarity = vt8500_pwm_set_polarity, .owner = THIS_MODULE, }; -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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