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

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Message-ID: <a7f9f8c6-7636-6c1d-ecd8-39e5a956b85a@microchip.com>
Date:   Tue, 14 Jan 2020 14:58:23 +0000
From:   <Claudiu.Beznea@...rochip.com>
To:     <alexandre.belloni@...tlin.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 13:17, Alexandre Belloni wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> 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 ?

Different meaning for CIDR register bits. Version is kept on bits 4 to 0
but not documented in public datasheet, so version displayed by
drivers/soc/atmel/soc.c should work.

Thank you,
Claudiu Beznea

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