Patch "pwm: Let the of_xlate callbacks accept references without period" has been added to the 6.8-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    pwm: Let the of_xlate callbacks accept references without period

to the 6.8-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     pwm-let-the-of_xlate-callbacks-accept-references-wit.patch
and it can be found in the queue-6.8 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 82fe02654b49366cd5714e8badfa381e0452ebcc
Author: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
Date:   Tue Jan 9 22:34:33 2024 +0100

    pwm: Let the of_xlate callbacks accept references without period
    
    [ Upstream commit 40ade0c2e7940becad70a0643ba90488b905b468 ]
    
    With this extension of_pwm_xlate_with_flags() is suitable to replace the
    custom xlate function of the pwm-clps711x driver.
    
    While touching these very similar functions align their implementations.
    
    Link: https://lore.kernel.org/r/127622315d07d9d419ae8e6373c7e5be7fab7a62.1704835845.git.u.kleine-koenig@xxxxxxxxxxxxxx
    Signed-off-by: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
    Stable-dep-of: 3e551115aee0 ("pwm: meson: Add check for error from clk_round_rate()")
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index 31f210872a079..606d9ef0c7097 100644
--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c
@@ -107,8 +107,8 @@ of_pwm_xlate_with_flags(struct pwm_chip *chip, const struct of_phandle_args *arg
 {
 	struct pwm_device *pwm;
 
-	/* flags in the third cell are optional */
-	if (args->args_count < 2)
+	/* period in the second cell and flags in the third cell are optional */
+	if (args->args_count < 1)
 		return ERR_PTR(-EINVAL);
 
 	if (args->args[0] >= chip->npwm)
@@ -118,9 +118,10 @@ of_pwm_xlate_with_flags(struct pwm_chip *chip, const struct of_phandle_args *arg
 	if (IS_ERR(pwm))
 		return pwm;
 
-	pwm->args.period = args->args[1];
-	pwm->args.polarity = PWM_POLARITY_NORMAL;
+	if (args->args_count > 1)
+		pwm->args.period = args->args[1];
 
+	pwm->args.polarity = PWM_POLARITY_NORMAL;
 	if (args->args_count > 2 && args->args[2] & PWM_POLARITY_INVERTED)
 		pwm->args.polarity = PWM_POLARITY_INVERSED;
 
@@ -133,18 +134,15 @@ of_pwm_single_xlate(struct pwm_chip *chip, const struct of_phandle_args *args)
 {
 	struct pwm_device *pwm;
 
-	/* 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(chip, 0, NULL);
 	if (IS_ERR(pwm))
 		return pwm;
 
-	pwm->args.period = args->args[0];
-	pwm->args.polarity = PWM_POLARITY_NORMAL;
+	if (args->args_count > 1)
+		pwm->args.period = args->args[0];
 
-	if (args->args_count == 2 && args->args[1] & PWM_POLARITY_INVERTED)
+	pwm->args.polarity = PWM_POLARITY_NORMAL;
+	if (args->args_count > 1 && args->args[1] & PWM_POLARITY_INVERTED)
 		pwm->args.polarity = PWM_POLARITY_INVERSED;
 
 	return pwm;