[PATCH 3/6] pwm: sun4i: Add a quirk for bus clock

[Jernej Skrabec]

H6 PWM core needs bus clock to be enabled in order to work.

Add a quirk for it.

Signed-off-by: Jernej Skrabec <jernej.skra...@siol.net>
---
 drivers/pwm/pwm-sun4i.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/pwm/pwm-sun4i.c b/drivers/pwm/pwm-sun4i.c
index 1b7be8fbde86..7d3ac3f2dc3f 100644
--- a/drivers/pwm/pwm-sun4i.c
+++ b/drivers/pwm/pwm-sun4i.c
@@ -72,6 +72,7 @@ static const u32 prescaler_table[] = {
 };
 
 struct sun4i_pwm_data {
+       bool has_bus_clock;
        bool has_prescaler_bypass;
        bool has_reset;
        unsigned int npwm;
@@ -79,6 +80,7 @@ struct sun4i_pwm_data {
 
 struct sun4i_pwm_chip {
        struct pwm_chip chip;
+       struct clk *bus_clk;
        struct clk *clk;
        struct reset_control *rst;
        void __iomem *base;
@@ -382,6 +384,16 @@ static int sun4i_pwm_probe(struct platform_device *pdev)
                reset_control_deassert(pwm->rst);
        }
 
+       if (pwm->data->has_bus_clock) {
+               pwm->bus_clk = devm_clk_get(&pdev->dev, "bus");
+               if (IS_ERR(pwm->bus_clk)) {
+                       ret = PTR_ERR(pwm->bus_clk);
+                       goto err_bus;
+               }
+
+               clk_prepare_enable(pwm->bus_clk);
+       }
+
        pwm->chip.dev = &pdev->dev;
        pwm->chip.ops = &sun4i_pwm_ops;
        pwm->chip.base = -1;
@@ -402,6 +414,8 @@ static int sun4i_pwm_probe(struct platform_device *pdev)
        return 0;
 
 err_pwm_add:
+       clk_disable_unprepare(pwm->bus_clk);
+err_bus:
        reset_control_assert(pwm->rst);
 
        return ret;
@@ -416,6 +430,7 @@ static int sun4i_pwm_remove(struct platform_device *pdev)
        if (ret)
                return ret;
 
+       clk_disable_unprepare(pwm->bus_clk);
        reset_control_assert(pwm->rst);
 
        return 0;
-- 
2.22.0