linux-kernel - Re: [PATCH v3 03/21] spi: dw: Detach SPI device specific CR0 config method

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Message-ID: <20201002174725.rpwdgfo6xzxafqhs@mobilestation>
Date:   Fri, 2 Oct 2020 20:47:26 +0300
From:   Serge Semin <Sergey.Semin@...kalelectronics.ru>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
CC:     Serge Semin <fancer.lancer@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Ramil Zaripov <Ramil.Zaripov@...kalelectronics.ru>,
        Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>,
        Lars Povlsen <lars.povlsen@...rochip.com>,
        "wuxu . wu" <wuxu.wu@...wei.com>, Feng Tang <feng.tang@...el.com>,
        Rob Herring <robh+dt@...nel.org>, <linux-spi@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 03/21] spi: dw: Detach SPI device specific CR0 config
 method

On Fri, Oct 02, 2020 at 01:22:46PM +0300, Andy Shevchenko wrote:
> On Fri, Oct 02, 2020 at 01:28:11AM +0300, Serge Semin wrote:
> > Indeed there is no point in detecting the SPI peripheral device parameters
> > and initializing the CR0 register fields each time an SPI transfer is
> > executed. Instead let's define a dedicated CR0 chip-data member, which
> > will be initialized in accordance with the SPI device settings at the
> > moment of setting it up.
> > 
> > By doing so we'll finally make the SPI device chip_data serving as it's
> > supposed to - to preserve the SPI device specific DW SPI configuration.
> > See spi-fsl-dspi.c, spi-pl022.c, spi-pxa2xx.c drivers for example of the
> > way the chip data is utilized.
> 
> > +static void dw_spi_update_cr0(struct dw_spi *dws, struct spi_device *spi,
> > +			      struct spi_transfer *transfer)
> 

> Yep, why not to place this in previous patch exactly here?

The previous patch is about introducing the DWC SSI capability. This one is
about splitting the functionality up.

> 
> > +	/*
> > +	 * Update CR0 data each time the setup callback is invoked since
> > +	 * the device parameters could have been changed, for instance, by
> > +	 * the MMC SPI driver or something else.
> > +	 */
> > +	chip->cr0 = dw_spi_get_cr0(dws, spi);
> 

> I would rather name it prepare or alike. 'get' assumes getting value or
> something like that.

This seems reasonable. What verb do you think would be better: prepare,
calc, assemble, construct, make, compute, collect, compose, form, compile, etc ?
Personally prepare or calc or assemble are the best candidates. What do you
think?

-Sergey

> 
> -- 
> With Best Regards,
> Andy Shevchenko
> 
>