From d6b6d476ec8cf8a46616ab0867bff00e47517401 Mon Sep 17 00:00:00 2001
From: Bjorn Andersson <bjorn.andersson@linaro.org>
Date: Mon, 25 Oct 2021 10:09:23 -0700
Subject: pwm: Introduce single-PWM of_xlate function
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Git-commit: 3ab7b6ac5d829e60c3b89d415811ff1c9f358c8e
Patch-mainline: v5.17-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225
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
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/pwm/core.c | 26 ++++++++++++++++++++++++++
drivers/pwm/pwm-pxa.c | 16 +---------------
include/linux/pwm.h | 2 ++
3 files changed, 29 insertions(+), 15 deletions(-)
diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index 35e894f4a379..90988cb22642 100644
--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c
@@ -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)
diff --git a/drivers/pwm/pwm-pxa.c b/drivers/pwm/pwm-pxa.c
index e091a528e33c..6967187ee59e 100644
--- a/drivers/pwm/pwm-pxa.c
+++ b/drivers/pwm/pwm-pxa.c
@@ -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;
}
diff --git a/include/linux/pwm.h b/include/linux/pwm.h
index a0b7e43049d5..a80ac89770e2 100644
--- a/include/linux/pwm.h
+++ b/include/linux/pwm.h
@@ -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,
--
2.38.1