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

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Date:   Fri, 11 Dec 2020 11:50:55 +0000
From:   Sudeep Holla <sudeep.holla@....com>
To:     Alexandre Belloni <alexandre.belloni@...tlin.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 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.

-- 
Regards,
Sudeep