linux-kernel - Re: [PATCH 1/2] serial: mctrl_gpio: add a new API to enable / disable wake

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Message-ID: <YgJAyAZFJBFXQGvf@kroah.com>
Date:   Tue, 8 Feb 2022 11:07:04 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Erwan LE RAY <erwan.leray@...s.st.com>
Cc:     Andy Shevchenko <andy.shevchenko@...il.com>,
        Jiri Slaby <jirislaby@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Gerald Baeza <gerald.baeza@...com>,
        Valentin Caron <valentin.caron@...s.st.com>,
        "linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] serial: mctrl_gpio: add a new API to enable /
 disable wake_irq

On Fri, Feb 04, 2022 at 04:41:58PM +0100, Erwan LE RAY wrote:
> Hi Andy,
> 
> On 2/4/22 10:07 AM, Andy Shevchenko wrote:
> > 
> > 
> > On Thursday, February 3, 2022, Erwan Le Ray <erwan.leray@...s.st.com
> > <mailto:erwan.leray@...s.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@...s.st.com
> >     <mailto:erwan.leray@...s.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 ?

Sadly, this is the format in this file, so I'll take this as-is.

thanks,

greg k-h