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pwm: Introduce single-PWM of_xlate function

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The existing pxa driver and the upcoming addition of PWM support in the
TI sn565dsi86 DSI/eDP bridge driver both has a single PWM channel and
thereby a need for a of_xlate function with the period as its single
argument.

Introduce a common helper function in the core that can be used as
of_xlate by such drivers and migrate the pxa driver to use this.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Tested-by: Steev Klimaszewski <steev@kali.org>
Tested-By: Steev Klimaszewski <steev@kali.org>
Signed-off-by: Robert Foss <robert.foss@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20211025170925.3096444-1-bjorn.andersson@linaro.org
This commit is contained in:
Bjorn Andersson 2021-10-25 10:09:23 -07:00 committed by Robert Foss
parent 086b90c76f
commit 3ab7b6ac5d
No known key found for this signature in database
GPG Key ID: 3EFD900F76D1D784
3 changed files with 29 additions and 15 deletions
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26
drivers/pwm/core.c
View File

@ -152,6 +152,32 @@ of_pwm_xlate_with_flags(struct pwm_chip *pc, const struct of_phandle_args *args)
}
EXPORT_SYMBOL_GPL(of_pwm_xlate_with_flags);
struct pwm_device *
of_pwm_single_xlate(struct pwm_chip *pc, const struct of_phandle_args *args)
{
struct pwm_device *pwm;
if (pc->of_pwm_n_cells < 1)
return ERR_PTR(-EINVAL);
/* validate that one cell is specified, optionally with flags */
if (args->args_count != 1 && args->args_count != 2)
return ERR_PTR(-EINVAL);
pwm = pwm_request_from_chip(pc, 0, NULL);
if (IS_ERR(pwm))
return pwm;
pwm->args.period = args->args[0];
pwm->args.polarity = PWM_POLARITY_NORMAL;
if (args->args_count == 2 && args->args[2] & PWM_POLARITY_INVERTED)
pwm->args.polarity = PWM_POLARITY_INVERSED;
return pwm;
}
EXPORT_SYMBOL_GPL(of_pwm_single_xlate);
static void of_pwmchip_add(struct pwm_chip *chip)
{
if (!chip->dev || !chip->dev->of_node)

16
drivers/pwm/pwm-pxa.c
View File

@ -148,20 +148,6 @@ static const struct platform_device_id *pxa_pwm_get_id_dt(struct device *dev)
return id ? id->data : NULL;
}
static struct pwm_device *
pxa_pwm_of_xlate(struct pwm_chip *pc, const struct of_phandle_args *args)
{
struct pwm_device *pwm;
pwm = pwm_request_from_chip(pc, 0, NULL);
if (IS_ERR(pwm))
return pwm;
pwm->args.period = args->args[0];
return pwm;
}
static int pwm_probe(struct platform_device *pdev)
{
const struct platform_device_id *id = platform_get_device_id(pdev);
@ -187,7 +173,7 @@ static int pwm_probe(struct platform_device *pdev)
pc->chip.npwm = (id->driver_data & HAS_SECONDARY_PWM) ? 2 : 1;
if (IS_ENABLED(CONFIG_OF)) {
pc->chip.of_xlate = pxa_pwm_of_xlate;
pc->chip.of_xlate = of_pwm_single_xlate;
pc->chip.of_pwm_n_cells = 1;
}

2
include/linux/pwm.h
View File

@ -414,6 +414,8 @@ struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip,
struct pwm_device *of_pwm_xlate_with_flags(struct pwm_chip *pc,
const struct of_phandle_args *args);
struct pwm_device *of_pwm_single_xlate(struct pwm_chip *pc,
const struct of_phandle_args *args);
struct pwm_device *pwm_get(struct device *dev, const char *con_id);
struct pwm_device *of_pwm_get(struct device *dev, struct device_node *np,