linux-kernel - Re: [PATCH 07/11] dt-bindings: spi: spi-nxp-fspi: add a new property nxp,fspi-dll-slvdly

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Message-ID: <be521f90-97ce-c61d-d7d6-8f2bde24d824@linaro.org>
Date:   Tue, 5 Jul 2022 16:12:38 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Michael Walle <michael@...le.cc>, Han Xu <han.xu@....com>
Cc:     Bough Chen <haibo.chen@....com>, ashish.kumar@....com,
        yogeshgaur.83@...il.com, broonie@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, singh.kuldeep87k@...il.com,
        tudor.ambarus@...rochip.com, p.yadav@...com,
        miquel.raynal@...tlin.com, richard@....at, vigneshr@...com,
        shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
        linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-mtd@...ts.infradead.org,
        festevam@...il.com, dl-linux-imx <linux-imx@....com>,
        linux-arm-kernel@...ts.infradead.org, zhengxunli@...c.com.tw
Subject: Re: [PATCH 07/11] dt-bindings: spi: spi-nxp-fspi: add a new property
 nxp,fspi-dll-slvdly

On 05/07/2022 16:06, Michael Walle wrote:
> 
>>>
>>> I think you could use here clock cycles or clock phase, but then it 
>>> has to be obvious
>>> it is that unit.
>>
>> Hi Krzysztof,
>>
>> Let me clarify it, in the document a term "delay cell" was used to
>> descript this register bit. Each delay cell equals "1/32 clock phase",
>> so the unit of delay cell is clock phase. The value user need set in
>> DT just number to define how many delay cells needed.
> 
> Then should the unit be "-degrees" and the possible range 0-180?

Thanks. We don't have it documented currently, but the unit seems
reasonable.

Best regards,
Krzysztof