linux-kernel - Re: [PATCH] drivers: soc: atmel: Avoid calling at91_soc

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Message-ID: <20201211115800.GG1781038@piout.net>
Date:   Fri, 11 Dec 2020 12:58:00 +0100
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Sudeep Holla <sudeep.holla@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Ludovic Desroches <ludovic.desroches@...rochip.com>
Subject: Re: [PATCH] drivers: soc: atmel: Avoid calling at91_soc_init on non
 AT91 SoCs

On 11/12/2020 11:50:55+0000, Sudeep Holla wrote:
> On Fri, Dec 11, 2020 at 12:45:15PM +0100, Alexandre Belloni wrote:
> > Hello,
> > 
> > On 11/12/2020 10:31:43+0000, Sudeep Holla wrote:
> > > Since at91_soc_init is called unconditionally from atmel_soc_device_init,
> > > we get the following warning on all non AT91 SoCs:
> > > 	" AT91: Could not find identification node"
> > > 
> > > Fix the same by filtering with allowed AT91 SoC list.
> > > 
> > > Cc: Nicolas Ferre <nicolas.ferre@...rochip.com>
> > > Cc: Alexandre Belloni <alexandre.belloni@...tlin.com>
> > > Cc: Ludovic Desroches <ludovic.desroches@...rochip.com>
> > > Signed-off-by: Sudeep Holla <sudeep.holla@....com>
> > > ---
> > >  drivers/soc/atmel/soc.c | 11 +++++++++++
> > >  1 file changed, 11 insertions(+)
> > > 
> > > diff --git a/drivers/soc/atmel/soc.c b/drivers/soc/atmel/soc.c
> > > index c4472b68b7c2..ba9fc07cd91c 100644
> > > --- a/drivers/soc/atmel/soc.c
> > > +++ b/drivers/soc/atmel/soc.c
> > > @@ -271,8 +271,19 @@ struct soc_device * __init at91_soc_init(const struct at91_soc *socs)
> > >  	return soc_dev;
> > >  }
> > >  
> > > +static const struct of_device_id at91_soc_allowed_list[] __initconst = {
> > > +	{ .compatible = "atmel,at91rm9200", },
> > > +	{ .compatible = "atmel,at91sam9260", },
> > > +	{ .compatible = "atmel,sama5d2", },
> > 
> > This is a very small subset of the supported SoCs. a proper list would
> > be:
> > 
> > atmel,at91rm9200
> > atmel,at91sam9
> > atmel,sama5
> > atmel,samv7
> > 
> 
> Sure I can update it but the existing functions at91_get_cidr_exid_from_chipid
> and at91_get_cidr_exid_from_dbgu check for following 3 compatibles and bail
> out if not found:
> "atmel,at91rm9200-dbgu"
> "atmel,at91sam9260-dbgu"
> "atmel,sama5d2-chipid"
> 
> Quick check on DTS upstream suggested only 3 platforms, hence the choice.
> 

No, atmel,at91sam9260-dbgu is used on most platforms:
$ git grep atmel,at91sam9260-dbgu arch/arm/boot/dts/
arch/arm/boot/dts/at91sam9260.dtsi:                             compatible = "atmel,at91sam9260-dbgu", "atmel,at91sam9260-usart";
arch/arm/boot/dts/at91sam9261.dtsi:                             compatible = "atmel,at91sam9260-dbgu", "atmel,at91sam9260-usart";
arch/arm/boot/dts/at91sam9263.dtsi:                             compatible = "atmel,at91sam9260-dbgu", "atmel,at91sam9260-usart";
arch/arm/boot/dts/at91sam9g45.dtsi:                             compatible = "atmel,at91sam9260-dbgu", "atmel,at91sam9260-usart";
arch/arm/boot/dts/at91sam9n12.dtsi:                             compatible = "atmel,at91sam9260-dbgu", "atmel,at91sam9260-usart";
arch/arm/boot/dts/at91sam9rl.dtsi:                              compatible = "atmel,at91sam9260-dbgu", "atmel,at91sam9260-usart";
arch/arm/boot/dts/at91sam9x5.dtsi:                              compatible = "atmel,at91sam9260-dbgu", "atmel,at91sam9260-usart";
arch/arm/boot/dts/sam9x60.dtsi:                         compatible = "microchip,sam9x60-dbgu", "microchip,sam9x60-usart", "atmel,at91sam9260-dbgu", "atmel,at91sam9260-usart";
arch/arm/boot/dts/sama5d3.dtsi:                         compatible = "atmel,at91sam9260-dbgu", "atmel,at91sam9260-usart";
arch/arm/boot/dts/sama5d4.dtsi:                         compatible = "atmel,at91sam9260-dbgu", "atmel,at91sam9260-usart";


> -- 
> Regards,
> Sudeep

-- 
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com