pwm: Give some sysfs related variables and functions better names
The code handling the sysfs API uses "child" and "parent" to refer to the devices corresponding to a struct pwm or a struct pwm_chip respectively. Other parts of the pwm core use "parent" to refer to the parent device of a struct pwm_chip. So rename "child" to "pwm_dev" and "parent" to "pwmchip_dev" which better explains the semantic. Also two functions are changed to match the new names: child_to_pwm_export() -> pwmexport_from_dev() child_to_pwm_device() -> pwm_from_dev() (which have the additional advantage to start with "pwm" which gives the right scope). Additionally introduce a wrapper for dev_get_drvdata() to convert a pwmchip_dev to the respective pwm_chip. Link: https://lore.kernel.org/r/9cc05aceeae2f06ecb850bccb15ba821e768c183.1710670958.git.u.kleine-koenig@pengutronix.deSigned-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
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