linux-kernel - Re: [PATCH] ARM: dts: at91: sama7g5: Add NAND support

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Message-ID: <3cc35822-cbfb-28e5-5fdb-76ceb1eebd27@microchip.com>
Date:   Fri, 25 Feb 2022 11:28:45 +0100
From:   Nicolas Ferre <nicolas.ferre@...rochip.com>
To:     Tudor Ambarus - M18064 <Tudor.Ambarus@...rochip.com>
CC:     "alexandre.belloni@...tlin.com" <alexandre.belloni@...tlin.com>,
        "Ludovic Desroches - M43218" <Ludovic.Desroches@...rochip.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ARM: dts: at91: sama7g5: Add NAND support

On 24/02/2022 at 19:26, Tudor Ambarus - M18064 wrote:
> On 2/24/22 19:44, Nicolas Ferre wrote:
>> Hi Tudor,
> 
> Hi,
> 
>>
>> On 24/02/2022 at 16:49, Tudor Ambarus - M18064 wrote:
>>> On 2/24/22 17:04, Nicolas Ferre wrote:
>>>> On 11/01/2022 at 14:05, Tudor Ambarus wrote:
>>>>> Add NAND support. The sama7g5's SMC IP is the same as sama5d2's with
>>>>> a slightly change: it provides a synchronous clock output (SMC clock)
>>>>> that is dedicated to FPGA usage. Since this doesn't interfere with the SMC
>>>>> NAND configuration, thus code will not be added in the current nand driver
>>>>> to address the FPGA usage, use the sama5d2's compatible and choose not to
>>>>> introduce dedicated compatibles for sama7g5.
>>>>> Tested with Micron MT29F4G08ABAEAWP NAND flash.
>>>>>
>>>>> Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>
>>>>
>>>> Acked-by: Nicolas Ferre <nicolas.ferre@...rochip.com>
>>>>
>>>>> ---
>>>>> The patch depends on the following patch:
>>>>> https://lore.kernel.org/linux-clk/20220111125310.902856-1-tudor.ambarus@microchip.com/T/#u
>>>>
>>>> Patch seems taken, so I add this one to at91-dt branch for 5.18 merge window.
>>>>
>>>
>>> I think it depends on who gets to next first. If at91 gets before clk,
>>> there will be a build error, isn't it?
>>
> 
> Sorry, not linux-next, but whose PR gets first applied by Linus.
> 
>> Clk patch is already in linux-next, so no worries.
>> Moreover, I don't get why there could be a build error as there is no build dependency between DT changes and C changes.
>> Sorry but I'm puzzled... Or I'm not looking at the right patch.
>>
> 
> You would see this kind of error:
> Error: arch/arm/boot/dts/sama7g5.dtsi:102.21-22 syntax error
> FATAL ERROR: Unable to parse input tree
> make[1]: *** [scripts/Makefile.lib:346: arch/arm/boot/dts/at91-sama7g5ek.dtb] Error 1
> make[1]: *** Waiting for unfinished jobs....
> make: *** [Makefile:1385: dtbs] Error 2
> make: *** Waiting for unfinished jobs....
> 
> This patch uses "PMC_MCK1" which is defined in:
> https://lore.kernel.org/linux-clk/20220111125310.902856-1-tudor.ambarus@microchip.com/T/#u
> 
> If Linus applies the arm-soc PR before the clk PR, it will see the same error, no?

Yes, absolutely.
So I need to have an immutable branch from Stephen then. I'm removing 
the patch from the at91-dt branch for now.

Thanks for the insight and sorry not having overlooked at that crucial 
piece of header file ;-)

Best regards,
   Nicolas

-- 
Nicolas Ferre