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Message-Id: <20210423213304.1371143-1-bjorn.andersson@linaro.org>
Date: Fri, 23 Apr 2021 16:33:04 -0500
From: Bjorn Andersson <bjorn.andersson@...aro.org>
To: Thierry Reding <thierry.reding@...il.com>,
Uwe Kleine-König
<u.kleine-koenig@...gutronix.de>, Lee Jones <lee.jones@...aro.org>
Cc: linux-pwm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2] pwm: Introduce single-PWM of_xlate function
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@...aro.org>
---
Changes since v1:
- Included the pwm.h change in the commit...
drivers/pwm/core.c | 24 ++++++++++++++++++++++++
drivers/pwm/pwm-pxa.c | 16 +---------------
include/linux/pwm.h | 2 ++
3 files changed, 27 insertions(+), 15 deletions(-)
diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index c4d5c0667137..25ed23cdf0d3 100644
--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c
@@ -176,6 +176,30 @@ of_pwm_simple_xlate(struct pwm_chip *pc, const struct of_phandle_args *args)
return pwm;
}
+struct pwm_device *
+of_pwm_single_xlate(struct pwm_chip *pc, const struct of_phandle_args *args)
+{
+ struct pwm_device *pwm;
+
+ /* sanity check driver is single PWM */
+ if (pc->of_pwm_n_cells != 1)
+ return ERR_PTR(-EINVAL);
+
+ /* validate that one cell is specified */
+ if (args->args_count != 1)
+ 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;
+
+ 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 cfb683827d32..8cd82fb54483 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)
pwm->chip.npwm = (id->driver_data & HAS_SECONDARY_PWM) ? 2 : 1;
if (IS_ENABLED(CONFIG_OF)) {
- pwm->chip.of_xlate = pxa_pwm_of_xlate;
+ pwm->chip.of_xlate = of_pwm_single_xlate;
pwm->chip.of_pwm_n_cells = 1;
}
diff --git a/include/linux/pwm.h b/include/linux/pwm.h
index 5bb90af4997e..0ac242a5b5e4 100644
--- a/include/linux/pwm.h
+++ b/include/linux/pwm.h
@@ -405,6 +405,8 @@ 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,
--
2.31.0
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