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Date:   Fri, 11 Dec 2020 12:14:05 +0000
From:   Sudeep Holla <sudeep.holla@arm.com>
To:     Alexandre Belloni <alexandre.belloni@bootlin.com>
Cc:     linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        Nicolas Ferre <nicolas.ferre@microchip.com>,
        Ludovic Desroches <ludovic.desroches@microchip.com>
Subject: Re: [PATCH] drivers: soc: atmel: Avoid calling at91_soc_init on non
 AT91 SoCs
Message-ID: <20201211121405.xhk7kz3khbut7uuw@bogus>
References: <20201211103143.1332302-1-sudeep.holla@arm.com>
 <20201211114515.GF1781038@piout.net>
 <20201211115055.acoezgrwh45hw6is@bogus>
 <20201211115800.GG1781038@piout.net>
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On Fri, Dec 11, 2020 at 12:58:00PM +0100, Alexandre Belloni wrote:
> 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@microchip.com>
> > > > Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>
> > > > Cc: Ludovic Desroches <ludovic.desroches@microchip.com>
> > > > Signed-off-by: Sudeep Holla <sudeep.holla@arm.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";
> 

Ah, I must have messed up my grep then for sure. Also not familiar with
AT91 series of platforms. I will respin with the list you suggested. Thanks!

--
Regards,
Sudeep