Commit 85a834c4 authored by Lee Jones's avatar Lee Jones Committed by Thierry Reding
Browse files

pwm: sti: It's now valid for number of PWM channels to be zero 



Setting up the STI PWM IP as capture only, with zero PWM output devices
is a perfectly valid configuration. It is no longer okay to assume that
there must be at least 1 PWM output device. In this patch we make the
default number of PWM output devices zero and only configure channels
explicitly requested.

Reported-by: default avatarPeter Griffin <peter.griffin@linaro.org>
Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
Signed-off-by: default avatarThierry Reding <thierry.reding@gmail.com>
parent c97267ae

drivers/pwm/pwm-sti.c

+14 −1
Original line number Diff line number Diff line
@@ -483,6 +483,11 @@ static int sti_pwm_probe_dt(struct sti_pwm_chip *pc) 
	if (!ret)

		cdata->cpt_num_devs = num_devs;



	if (!cdata->pwm_num_devs && !cdata->cpt_num_devs) {

		dev_err(dev, "No channels configured\n");

		return -EINVAL;

	}



	reg_fields = cdata->reg_fields;



	pc->prescale_low = devm_regmap_field_alloc(dev, pc->regmap,
@@ -573,7 +578,7 @@ static int sti_pwm_probe(struct platform_device *pdev) 
	cdata->reg_fields   = &sti_pwm_regfields[0];

	cdata->max_prescale = 0xff;

	cdata->max_pwm_cnt  = 255;

	cdata->pwm_num_devs = 1;

	cdata->pwm_num_devs = 0;

	cdata->cpt_num_devs = 0;



	pc->cdata = cdata;
@@ -585,6 +590,9 @@ static int sti_pwm_probe(struct platform_device *pdev) 
	if (ret)

		return ret;



	if (!cdata->pwm_num_devs)

		goto skip_pwm;



	pc->pwm_clk = of_clk_get_by_name(dev->of_node, "pwm");

	if (IS_ERR(pc->pwm_clk)) {

		dev_err(dev, "failed to get PWM clock\n");
@@ -597,6 +605,10 @@ static int sti_pwm_probe(struct platform_device *pdev) 
		return ret;

	}



skip_pwm:

	if (!cdata->cpt_num_devs)

		goto skip_cpt;



	pc->cpt_clk = of_clk_get_by_name(dev->of_node, "capture");

	if (IS_ERR(pc->cpt_clk)) {

		dev_err(dev, "failed to get PWM capture clock\n");
@@ -609,6 +621,7 @@ static int sti_pwm_probe(struct platform_device *pdev) 
		return ret;

	}



skip_cpt:

	pc->chip.dev = dev;

	pc->chip.ops = &sti_pwm_ops;

	pc->chip.base = -1;

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