linux-kernel - RE: [PATCH v2] serial: samsung: Re-factors UART IRQ resource for various Samsung SoC

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Message-ID: <046901d6520f$0bd565d0$23803170$@samsung.com>
Date:   Sat, 4 Jul 2020 19:55:47 +0530
From:   "M Tamseel Shams" <m.shams@...sung.com>
To:     "'Krzysztof Kozlowski'" <krzk@...nel.org>
Cc:     <kgene@...nel.org>, <gregkh@...uxfoundation.org>,
        <jslaby@...e.com>, <linux-arm-kernel@...ts.infradead.org>,
        <linux-samsung-soc@...r.kernel.org>,
        <linux-serial@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <alim.akhtar@...sung.com>
Subject: RE: [PATCH v2] serial: samsung: Re-factors UART IRQ resource for
 various Samsung SoC

> On Sun, Jun 28, 2020 at 12:30:07PM +0530, Tamseel Shams wrote:
> > In few older Samsung SoCs like s3c2410, s3c2412 and s3c2440, UART IP
> > is having 2 interrupt lines.
> > However, in other SoCs like s3c6400, s5pv210, exynos5433, and
> > exynos4210 UART is having only 1 interrupt line. Due to this,
> > "platform_get_irq(platdev, 1)"
> > call in the driver gives the following warning:
> > "IRQ index 1 not found" on recent platforms.
> >
> > This patch re-factors the IRQ resources handling for each platform and
> > hence fixing the above warnings seen on some platforms.
> >
> > Signed-off-by: Tamseel Shams <m.shams@...sung.com>
> > ---
> > Removed the RFC tag and using 'platform_get_irq_optional'
> > instead of 'platform_get_irq' as per comment received from Robin
> > Murphy.
> >
> >  drivers/tty/serial/samsung_tty.c | 14 ++++++++++++--
> >  1 file changed, 12 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/tty/serial/samsung_tty.c
> > b/drivers/tty/serial/samsung_tty.c
> > index 6ef614d8648c..60554f42e208 100644
> > --- a/drivers/tty/serial/samsung_tty.c
> > +++ b/drivers/tty/serial/samsung_tty.c
> > @@ -60,6 +60,7 @@ struct s3c24xx_uart_info {
> >  	char			*name;
> >  	unsigned int		type;
> >  	unsigned int		fifosize;
> > +	unsigned int		irq_cnt;
> 
> No, it's duplicating the logic.
> 
> The driver already checks whether SoC has two or one interrupt line with
> s3c24xx_serial_has_interrupt_mask() so there is no point to have two of such
> methods.
> 
> Instead unify it please. Probably entire
> s3c24xx_serial_has_interrupt_mask() and s3c24xx_serial_type() should be
> removed and switched into *serial_drv_data.
> 
> Best regards,
> Krzysztof

Hi Krzysztof,
Thanks for letting me know about duplication of logic.
I will remove my logic of checking of number of interrupt line
and replace it with check using s3c24xx_serial_has_interrupt_mask().

I will come up with another patch regarding the suggestion of removal 
of the two functions s3c24xx_serial_has_interrupt_mask() and 
s3c24xx_serial_type() and moving it to *serial_drv_data.

Thanks & Regards,
Tamseel