linux-kernel - Re: [PATCH 17/17] spi: dw: Use regset32 DebugFS method to create a registers file

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Date:   Wed, 13 May 2020 17:41:35 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Serge Semin <Sergey.Semin@...kalelectronics.ru>
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>,
        Paul Burton <paulburton@...nel.org>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Arnd Bergmann <arnd@...db.de>,
        Allison Randal <allison@...utok.net>,
        Gareth Williams <gareth.williams.jx@...esas.com>,
        Rob Herring <robh+dt@...nel.org>, linux-mips@...r.kernel.org,
        devicetree@...r.kernel.org, fengsheng <fengsheng5@...wei.com>,
        Phil Edworthy <phil.edworthy@...esas.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Xinwei Kong <kong.kongxinwei@...ilicon.com>,
        Aditya Pakki <pakki001@....edu>,
        "wuxu.wu" <wuxu.wu@...wei.com>,
        Charles Keepax <ckeepax@...nsource.cirrus.com>,
        Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 17/17] spi: dw: Use regset32 DebugFS method to create a
 registers file

On Wed, May 13, 2020 at 03:44:22PM +0300, Serge Semin wrote:
> On Fri, May 08, 2020 at 10:30:27PM +0300, Andy Shevchenko wrote:
> > On Fri, May 08, 2020 at 04:29:42PM +0300, Serge Semin wrote:
> > > DebugFS kernel interface provides a dedicated method to create the
> > > registers dump file. Use it instead of creating a generic DebugFS
> > > file with manually written read callback function.

> > > +#define DW_SPI_DBGFS_REG(_name, _off)	\
> > > +{					\
> > > +	.name = _name,			\
> > > +	.offset = _off			\
> > 
> > Leave comma here.
> 
> don't see a point.

It will help in case if this getting extended. Also slightly better to
distinguish between terminator type of members vs. data structures.

> > >  }

> > > +	struct debugfs_regset32 regset;
> > 
> > I'm wondering why we need it here and not simple on the stack?
> 
> Please see the way the DebugFS regset work. A prompt: how does the DebugFS
> core get to know what is a base address of the registers? =)

If they have a member in the struct which passed thru private pointer of inode.
But I see your point.

-- 
With Best Regards,
Andy Shevchenko