linux-kernel - Re: [PATCH v5 01/16] spi: dw: Set xfer effective_speed

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Message-ID: <afdf414a-df95-b130-85e8-cda5bf4e9405@cogentembedded.com>
Date:   Fri, 29 May 2020 11:49:12 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:     Serge Semin <Sergey.Semin@...kalelectronics.ru>,
        Mark Brown <broonie@...nel.org>
Cc:     Serge Semin <fancer.lancer@...il.com>,
        Georgy Vlasov <Georgy.Vlasov@...kalelectronics.ru>,
        Ramil Zaripov <Ramil.Zaripov@...kalelectronics.ru>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Arnd Bergmann <arnd@...db.de>, Feng Tang <feng.tang@...el.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Rob Herring <robh+dt@...nel.org>, linux-mips@...r.kernel.org,
        devicetree@...r.kernel.org, linux-spi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 01/16] spi: dw: Set xfer effective_speed_hz

Hello!

On 29.05.2020 6:58, Serge Semin wrote:

> Seeing DW APB SSI controller doesn't support setting the exactly
> requested SPI bus frequency, but only a rounded frequency determined
> by means of the odd-numbered half-worded reference clock divider,
> it would be good tune the SPI core up and initialize the current
                   ^ to?

> transfer effective_speed_hz. By doing so the core will be able to
> execute the xfer-related delays with better accuracy.
> 
> Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
> Cc: Georgy Vlasov <Georgy.Vlasov@...kalelectronics.ru>
> Cc: Ramil Zaripov <Ramil.Zaripov@...kalelectronics.ru>
> Cc: Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>
> Cc: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
> Cc: Arnd Bergmann <arnd@...db.de>
> Cc: Feng Tang <feng.tang@...el.com>
> Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: linux-mips@...r.kernel.org
> Cc: devicetree@...r.kernel.org
[...]

MBR, Sergei