linux-kernel - Re: [PATCH v3 4/7] dt-bindings: atmel-usart: remove wildcard

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Date:   Tue, 14 Jan 2020 12:17:04 +0100
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Claudiu.Beznea@...rochip.com
Cc:     robh+dt@...nel.org, lee.jones@...aro.org, mark.rutland@....com,
        Nicolas.Ferre@...rochip.com, Ludovic.Desroches@...rochip.com,
        radu_nicolae.pirea@....ro, richard.genoud@...il.com,
        a.zummo@...ertech.it, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-spi@...r.kernel.org, linux-rtc@...r.kernel.org
Subject: Re: [PATCH v3 4/7] dt-bindings: atmel-usart: remove wildcard

On 14/01/2020 11:10:14+0000, Claudiu.Beznea@...rochip.com wrote:
> 
> 
> On 14.01.2020 12:42, Alexandre Belloni wrote:
> > EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> > 
> > On 14/01/2020 12:23:14+0200, Claudiu Beznea wrote:
> >> Remove chip whildcard and introduce the list of compatibles instead.
> >>
> >> Signed-off-by: Claudiu Beznea <claudiu.beznea@...rochip.com>
> >> ---
> >>  Documentation/devicetree/bindings/mfd/atmel-usart.txt | 7 +++----
> >>  1 file changed, 3 insertions(+), 4 deletions(-)
> >>
> >> diff --git a/Documentation/devicetree/bindings/mfd/atmel-usart.txt b/Documentation/devicetree/bindings/mfd/atmel-usart.txt
> >> index 699fd3c9ace8..778e8310606a 100644
> >> --- a/Documentation/devicetree/bindings/mfd/atmel-usart.txt
> >> +++ b/Documentation/devicetree/bindings/mfd/atmel-usart.txt
> >> @@ -1,10 +1,9 @@
> >>  * Atmel Universal Synchronous Asynchronous Receiver/Transmitter (USART)
> >>
> >>  Required properties for USART:
> >> -- compatible: Should be "atmel,<chip>-usart" or "atmel,<chip>-dbgu"
> >> -  The compatible <chip> indicated will be the first SoC to support an
> >> -  additional mode or an USART new feature.
> >> -  For the dbgu UART, use "atmel,<chip>-dbgu", "atmel,<chip>-usart"
> >> +- compatible: Should be one of the following:
> >> +     - "atmel,at91rm9200-dbgu", "atmel,at91rm9200-usart"
> >> +     - "atmel,at91sam9260-dbgu", "atmel,at91sam9260-usart"
> > 
> > All the uarts are not dbgus, so this need to be:
> > 
> >  - "atmel,at91rm9200-usart"
> >  - "atmel,at91sam9260-usart"
> >  - "atmel,at91rm9200-dbgu", "atmel,at91rm9200-usart"
> >  - "atmel,at91sam9260-dbgu", "atmel,at91sam9260-usart"
> 
> Ok!
> 
> > 
> > Also, you need to update drivers/soc/atmel/soc.c
> 
> OK. Did you refer to CIDR, EXID registers? They are at the same offsets as
> for the old products. So we can rely on old compatible for them. Is this OK?
> 

Then, what is the point of adding microchip,sam9x60-dbgu ?


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