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authorDavid Wu <david.wu@rock-chips.com>2017-08-08 23:38:29 +0800
committerThierry Reding <thierry.reding@gmail.com>2017-08-18 17:31:56 +0200
commit27922ff59893e3445f69e397bcd92ae06fa89ca7 (patch)
tree02b9c02ddef44631e13a63e7d7ca62b2a085dae6 /drivers/pwm/pwm-rockchip.c
parent1f8736c4e1ee1fd3d933208683a5315f9a9d6b5c (diff)
pwm: rockchip: Add APB and function both clocks support
New PWM module provides two individual clocks for APB clock and function clock. Signed-off-by: David Wu <david.wu@rock-chips.com> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Diffstat (limited to 'drivers/pwm/pwm-rockchip.c')
-rw-r--r--drivers/pwm/pwm-rockchip.c58
1 files changed, 49 insertions, 9 deletions
diff --git a/drivers/pwm/pwm-rockchip.c b/drivers/pwm/pwm-rockchip.c
index 744d56197286..ac3cd5ec5310 100644
--- a/drivers/pwm/pwm-rockchip.c
+++ b/drivers/pwm/pwm-rockchip.c
@@ -33,6 +33,7 @@
struct rockchip_pwm_chip {
struct pwm_chip chip;
struct clk *clk;
+ struct clk *pclk;
const struct rockchip_pwm_data *data;
void __iomem *base;
};
@@ -145,7 +146,7 @@ static void rockchip_pwm_get_state(struct pwm_chip *chip,
u64 tmp;
int ret;
- ret = clk_enable(pc->clk);
+ ret = clk_enable(pc->pclk);
if (ret)
return;
@@ -161,7 +162,7 @@ static void rockchip_pwm_get_state(struct pwm_chip *chip,
pc->data->get_state(chip, pwm, state);
- clk_disable(pc->clk);
+ clk_disable(pc->pclk);
}
static int rockchip_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
@@ -224,7 +225,7 @@ static int rockchip_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
pwm_get_state(pwm, &curstate);
enabled = curstate.enabled;
- ret = clk_enable(pc->clk);
+ ret = clk_enable(pc->pclk);
if (ret)
return ret;
@@ -257,7 +258,7 @@ static int rockchip_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
rockchip_pwm_get_state(chip, pwm, state);
out:
- clk_disable(pc->clk);
+ clk_disable(pc->pclk);
return ret;
}
@@ -328,7 +329,7 @@ static int rockchip_pwm_probe(struct platform_device *pdev)
const struct of_device_id *id;
struct rockchip_pwm_chip *pc;
struct resource *r;
- int ret;
+ int ret, count;
id = of_match_device(rockchip_pwm_dt_ids, &pdev->dev);
if (!id)
@@ -343,13 +344,43 @@ static int rockchip_pwm_probe(struct platform_device *pdev)
if (IS_ERR(pc->base))
return PTR_ERR(pc->base);
- pc->clk = devm_clk_get(&pdev->dev, NULL);
- if (IS_ERR(pc->clk))
- return PTR_ERR(pc->clk);
+ pc->clk = devm_clk_get(&pdev->dev, "pwm");
+ if (IS_ERR(pc->clk)) {
+ pc->clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(pc->clk)) {
+ ret = PTR_ERR(pc->clk);
+ if (ret != -EPROBE_DEFER)
+ dev_err(&pdev->dev, "Can't get bus clk: %d\n",
+ ret);
+ return ret;
+ }
+ }
+
+ count = of_count_phandle_with_args(pdev->dev.of_node,
+ "clocks", "#clock-cells");
+ if (count == 2)
+ pc->pclk = devm_clk_get(&pdev->dev, "pclk");
+ else
+ pc->pclk = pc->clk;
+
+ if (IS_ERR(pc->pclk)) {
+ ret = PTR_ERR(pc->pclk);
+ if (ret != -EPROBE_DEFER)
+ dev_err(&pdev->dev, "Can't get APB clk: %d\n", ret);
+ return ret;
+ }
ret = clk_prepare_enable(pc->clk);
- if (ret)
+ if (ret) {
+ dev_err(&pdev->dev, "Can't prepare enable bus clk: %d\n", ret);
return ret;
+ }
+
+ ret = clk_prepare(pc->pclk);
+ if (ret) {
+ dev_err(&pdev->dev, "Can't prepare APB clk: %d\n", ret);
+ goto err_clk;
+ }
platform_set_drvdata(pdev, pc);
@@ -368,12 +399,20 @@ static int rockchip_pwm_probe(struct platform_device *pdev)
if (ret < 0) {
clk_unprepare(pc->clk);
dev_err(&pdev->dev, "pwmchip_add() failed: %d\n", ret);
+ goto err_pclk;
}
/* Keep the PWM clk enabled if the PWM appears to be up and running. */
if (!pwm_is_enabled(pc->chip.pwms))
clk_disable(pc->clk);
+ return 0;
+
+err_pclk:
+ clk_unprepare(pc->pclk);
+err_clk:
+ clk_disable_unprepare(pc->clk);
+
return ret;
}
@@ -395,6 +434,7 @@ static int rockchip_pwm_remove(struct platform_device *pdev)
if (pwm_is_enabled(pc->chip.pwms))
clk_disable(pc->clk);
+ clk_unprepare(pc->pclk);
clk_unprepare(pc->clk);
return pwmchip_remove(&pc->chip);

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