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

Documentation/devicetree/bindings/pwm/pwm-rockchip.txt

+7 −1
Original line number Diff line number Diff line
@@ -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.

drivers/pwm/pwm-rockchip.c

+49 −9
Original line number Diff line number Diff line
@@ -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, "pwm");

	if (IS_ERR(pc->clk)) {

		pc->clk = devm_clk_get(&pdev->dev, NULL);

	if (IS_ERR(pc->clk))

		return PTR_ERR(pc->clk);

		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);