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

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Message-ID: <20200529094919.uw3fodztc3vvnj6a@mobilestation>
Date:   Fri, 29 May 2020 12:49:19 +0300
From:   Serge Semin <Sergey.Semin@...kalelectronics.ru>
To:     Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
CC:     Serge Semin <fancer.lancer@...il.com>,
        Mark Brown <broonie@...nel.org>,
        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

On Fri, May 29, 2020 at 11:49:12AM +0300, Sergei Shtylyov wrote:
> 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?

Thanks! I'll fix it in the next patchset version.

-Sergey

> 
> > 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