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| author | Fabrice Gasnier <fabrice.gasnier@st.com> | 2019-04-18 11:37:47 +0200 |
|---|---|---|
| committer | Thierry Reding <thierry.reding@gmail.com> | 2019-06-25 14:51:43 +0200 |
| commit | b2c200e3f2fd1158f5f1c93ccb2e0a27d96c4a7a (patch) | |
| tree | 37e6878972f4272b199d689de29d44d54267c9db /include/linux/pwm.h | |
| parent | cce4a833fc6dfdb43a492876ad06f506a61f8fbd (diff) | |
| download | lwn-b2c200e3f2fd1158f5f1c93ccb2e0a27d96c4a7a.tar.gz lwn-b2c200e3f2fd1158f5f1c93ccb2e0a27d96c4a7a.zip | |
pwm: Add consumer device link
Add a device link between the PWM consumer and the PWM provider. This
enforces the PWM user to get suspended before the PWM provider. It
allows proper synchronization of suspend/resume sequences: the PWM user
is responsible for properly stopping PWM, before the provider gets
suspended: see [1]. Add the device link in:
- of_pwm_get()
- pwm_get()
- devm_*pwm_get() variants
as it requires a reference to the device for the PWM consumer.
[1] https://lkml.org/lkml/2019/2/5/770
Suggested-by: Thierry Reding <thierry.reding@gmail.com>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Diffstat (limited to 'include/linux/pwm.h')
| -rw-r--r-- | include/linux/pwm.h | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/include/linux/pwm.h b/include/linux/pwm.h index eaa5c6e3fc9f..8bf5d5f6267d 100644 --- a/include/linux/pwm.h +++ b/include/linux/pwm.h @@ -405,7 +405,8 @@ struct pwm_device *of_pwm_xlate_with_flags(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_node *np, const char *con_id); +struct pwm_device *of_pwm_get(struct device *dev, struct device_node *np, + const char *con_id); void pwm_put(struct pwm_device *pwm); struct pwm_device *devm_pwm_get(struct device *dev, const char *con_id); @@ -493,7 +494,8 @@ static inline struct pwm_device *pwm_get(struct device *dev, return ERR_PTR(-ENODEV); } -static inline struct pwm_device *of_pwm_get(struct device_node *np, +static inline struct pwm_device *of_pwm_get(struct device *dev, + struct device_node *np, const char *con_id) { return ERR_PTR(-ENODEV); |