Commit 27922ff5 authored by David Wu's avatar David Wu Committed by Thierry Reding

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: default avatarDavid Wu <david.wu@rock-chips.com>
Acked-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarThierry Reding <thierry.reding@gmail.com>
parent 1f8736c4
......@@ -6,7 +6,13 @@ Required properties:
"rockchip,rk3288-pwm": found on RK3288 SoC
"rockchip,vop-pwm": found integrated in VOP on RK3288 SoC
- reg: physical base address and length of the controller's registers
- clocks: phandle and clock specifier of the PWM reference clock
- clocks: See ../clock/clock-bindings.txt
- For older hardware (rk2928, rk3066, rk3188, rk3228, rk3288, rk3399):
- There is one clock that's used both to derive the functional clock
for the device and as the bus clock.
- For newer hardware (rk3328 and future socs): specified by name
- "pwm": This is used to derive the functional clock.
- "pclk": This is the APB bus clock.
- #pwm-cells: must be 2 (rk2928) or 3 (rk3288). See pwm.txt in this directory
for a description of the cell format.
......
......@@ -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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