linux-kernel - Re: [03/12] bus: stm32-fmc2-ebi: add STM32 FMC2 EBI controller driver

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Date:   Mon, 30 Mar 2020 11:30:44 +0200
From:   Marek Vasut <marex@...x.de>
To:     Christophe Kerello <christophe.kerello@...com>,
        miquel.raynal@...tlin.com, richard@....at, vigneshr@...com,
        lee.jones@...aro.org, robh+dt@...nel.org, mark.rutland@....com,
        tony@...mide.com
Cc:     linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com
Subject: Re: [03/12] bus: stm32-fmc2-ebi: add STM32 FMC2 EBI controller driver

On 3/30/20 11:19 AM, Christophe Kerello wrote:
> 
> 
> On 3/30/20 3:24 AM, Marek Vasut wrote:
>> On 3/23/20 3:58 PM, Christophe Kerello wrote:
>>> The driver adds the support for the STMicroelectronics FMC2 EBI
>>> controller
>>> found on STM32MP SOCs.
>>>
>>
>> On DH STM32MP1 SoM in PDK2 carrier board,
>> Tested-by: Marek Vasut <marex@...x.de>
>>
>> btw. it seems this sets BTRx DATLAT and CLKDIV to 0xf , it's "Don't
>> care" in the datasheet for Muxed mode, but then it should probably be
>> set to 0.
> 
> Hi Marek,

Hi,

> Thanks for testing.

Sure

> These 2 bit fields (BTRx DATLAT and CLKDIV) are only needed for
> synchronous transactions. Based on your bindings, the transaction type
> is asynchronous.
> CLKDIV bit fields should not be set to 0x0, as this value is reserved
> for this bit field. The driver keeps the reset value when it is not
> needed to update a bit field.

Then I guess that's fine either way.