diff options
| author | Lee Jones <lee.jones@linaro.org> | 2016-08-16 10:35:06 +0100 |
|---|---|---|
| committer | Thierry Reding <thierry.reding@gmail.com> | 2016-09-08 10:55:11 +0200 |
| commit | 85a834c42a491deed9ac5bca549b93b7a5455d84 (patch) | |
| tree | 284fe84bd46ad1f5035d6f63862fb8c09af7f2ba | |
| parent | c97267ae831da2711e9592398d490dbd1f4d5ddd (diff) | |
| download | lwn-85a834c42a491deed9ac5bca549b93b7a5455d84.tar.gz lwn-85a834c42a491deed9ac5bca549b93b7a5455d84.zip | |
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: Peter Griffin <peter.griffin@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
| -rw-r--r-- | drivers/pwm/pwm-sti.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/drivers/pwm/pwm-sti.c b/drivers/pwm/pwm-sti.c index 95014f57a9c6..9a1ca1986c30 100644 --- a/drivers/pwm/pwm-sti.c +++ b/drivers/pwm/pwm-sti.c @@ -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; |