[1/2] serial: mctrl_gpio: add a new API to enable / disable wake_irq

Add a new API to enable / disable wake_irq in order to enable gpio irqs as
wakeup irqs for the uart port.

Signed-off-by: Erwan Le Ray <erwan.leray@foss.st.com>

Hi Andy,

On 2/4/22 10:07 AM, Andy Shevchenko wrote:
> 
> 
> On Thursday, February 3, 2022, Erwan Le Ray <erwan.leray@foss.st.com 
> <mailto:erwan.leray@foss.st.com>> wrote:
> 
>     Add a new API to enable / disable wake_irq in order to enable gpio
>     irqs as
>     wakeup irqs for the uart port.
> 
>     Signed-off-by: Erwan Le Ray <erwan.leray@foss.st.com
>     <mailto:erwan.leray@foss.st.com>>
> 
>     diff --git a/drivers/tty/serial/serial_mctrl_gpio.c
>     b/drivers/tty/serial/serial_mctrl_gpio.c
>     index c41d8911ce95..1663b3afc3a0 100644
>     --- a/drivers/tty/serial/serial_mctrl_gpio.c
>     +++ b/drivers/tty/serial/serial_mctrl_gpio.c
>     @@ -299,4 +299,42 @@ void mctrl_gpio_disable_ms(struct mctrl_gpios
>     *gpios)
>       }
>       EXPORT_SYMBOL_GPL(mctrl_gpio_disable_ms);
> 
>     +void mctrl_gpio_enable_irq_wake(struct mctrl_gpios *gpios)
>     +{
>     +       enum mctrl_gpio_idx i;
>     +
>     +       if (!gpios)
>     +               return;
>     +
>     +       if (!gpios->mctrl_on)
>     +               return;
>     +
>     +       for (i = 0; i < UART_GPIO_MAX; ++i) {
>     +               if (!gpios->irq[i])
>     +                       continue;
> 
> 
> 
> Why not simply
> 
>    if (gpios[])
>      enable_irq_...
> 
> ?
> 
> And same for disabling.
> 
>     +
>     +               enable_irq_wake(gpios->irq[i]);
>     +       }
>     +}
>     +EXPORT_SYMBOL_GPL(mctrl_gpio_enable_irq_wake);
>     +
>     +void mctrl_gpio_disable_irq_wake(struct mctrl_gpios *gpios)
>     +{
>     +       enum mctrl_gpio_idx i;
>     +
>     +       if (!gpios)
>     +               return;
>     +
>     +       if (!gpios->mctrl_on)
>     +               return;
>     +
>     +       for (i = 0; i < UART_GPIO_MAX; ++i) {
>     +               if (!gpios->irq[i])
>     +                       continue;
>     +
>     +               disable_irq_wake(gpios->irq[i]);
>     +       }
>     +}
>     +EXPORT_SYMBOL_GPL(mctrl_gpio_disable_irq_wake);
>     +
>       MODULE_LICENSE("GPL");
>     diff --git a/drivers/tty/serial/serial_mctrl_gpio.h
>     b/drivers/tty/serial/serial_mctrl_gpio.h
>     index b134a0ffc894..fc76910fb105 100644
>     --- a/drivers/tty/serial/serial_mctrl_gpio.h
>     +++ b/drivers/tty/serial/serial_mctrl_gpio.h
>     @@ -91,6 +91,16 @@ void mctrl_gpio_enable_ms(struct mctrl_gpios *gpios);
>        */
>       void mctrl_gpio_disable_ms(struct mctrl_gpios *gpios);
> 
>     +/*
>     + * Enable gpio wakeup interrupts to enable wake up source.
>     + */
>     +void mctrl_gpio_enable_irq_wake(struct mctrl_gpios *gpios);
>     +
>     +/*
>     + * Disable gpio wakeup interrupts to enable wake up source.
>     + */
>     +void mctrl_gpio_disable_irq_wake(struct mctrl_gpios *gpios);
>     +
>       #else /* GPIOLIB */
> 
>       static inline
>     @@ -142,6 +152,14 @@ static inline void mctrl_gpio_disable_ms(struct
>     mctrl_gpios *gpios)
>       {
>       }
> 
>     +static inline void mctrl_gpio_enable_irq_wake(struct mctrl_gpios
>     *gpios)
>     +{
>     +}
>     +
>     +static inline void mctrl_gpio_disable_irq_wake(struct mctrl_gpios
>     *gpios)
>     +{
>     +}
>     +
>       #endif /* GPIOLIB */
> 
>       #endif
>     -- 
>     2.17.1
> 
> 
> 
> -- 
> With Best Regards,
> Andy Shevchenko
> 
> 

Thanks for your review.
I fully agree with your comment, but I wrote this code like it is to 
keep the same structure than all the other ops of serial_mcrtrl_gpio 
driver. I preferred keeping an homogeneous code in the driver rather 
than breaking the driver homogeneity with the addition of an optimized code.

Greg, can you please indicate which solution you recommend ?

Cheers, Erwan.