linux-kernel - Re: [PATCH v4 10/11] i2c: designware: Move reg-space remapping into a dedicated function

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Date:   Wed, 27 May 2020 17:54:35 +0300
From:   Serge Semin <Sergey.Semin@...kalelectronics.ru>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
CC:     Serge Semin <fancer.lancer@...il.com>,
        Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
        Wolfram Sang <wsa@...-dreams.de>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Rob Herring <robh+dt@...nel.org>, <linux-mips@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-i2c@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 10/11] i2c: designware: Move reg-space remapping into
 a dedicated function

On Wed, May 27, 2020 at 04:58:01PM +0300, Andy Shevchenko wrote:
> On Wed, May 27, 2020 at 03:01:10PM +0300, Serge Semin wrote:
> > This is a preparation patch before adding a quirk with custom registers
> > map creation required for the Baikal-T1 System I2C support.
> 
> Looks good. Though one nit below.
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> 
> > Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
> > Cc: Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>
> > Cc: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
> > Cc: Rob Herring <robh+dt@...nel.org>
> > Cc: linux-mips@...r.kernel.org
> > Cc: devicetree@...r.kernel.org
> > 
> > ---
> > 
> > Changelog v3:
> > - This is a new patch, which has been created due to declining the
> >   glue-layer approach.
> > 
> > Changelog v4:
> > - Use PTR_ERR_OR_ZERO() helper in the bt1_i2c_request_regs() method.
> > - Discard devm_platform_get_and_ioremap_resource() utilization.
> > ---
> >  drivers/i2c/busses/i2c-designware-platdrv.c | 18 +++++++++++++-----
> >  1 file changed, 13 insertions(+), 5 deletions(-)
> > 
> > diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c
> > index ad292de2d260..061c8d506c7c 100644
> > --- a/drivers/i2c/busses/i2c-designware-platdrv.c
> > +++ b/drivers/i2c/busses/i2c-designware-platdrv.c
> > @@ -108,6 +108,15 @@ static void dw_i2c_plat_pm_cleanup(struct dw_i2c_dev *dev)
> >  		pm_runtime_put_noidle(dev->dev);
> >  }
> >  
> > +static int dw_i2c_plat_request_regs(struct dw_i2c_dev *dev)
> > +{
> > +	struct platform_device *pdev = to_platform_device(dev->dev);
> > +
> > +	dev->base = devm_platform_ioremap_resource(pdev, 0);
> > +
> > +	return PTR_ERR_OR_ZERO(dev->base);
> > +}
> > +
> >  static int dw_i2c_plat_probe(struct platform_device *pdev)
> >  {
> >  	struct dw_i2c_platform_data *pdata = dev_get_platdata(&pdev->dev);
> > @@ -125,15 +134,14 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)
> >  		return -ENOMEM;
> >  
> 
> >  	dev->flags |= (uintptr_t)device_get_match_data(&pdev->dev);
> 
> It's related to previous patch, but I just realized that '|' is not needed
> here. Care to amend in the previous patch?

Agreed. Thanks.

-Sergey

> 
> > -
> > -	dev->base = devm_platform_ioremap_resource(pdev, 0);
> > -	if (IS_ERR(dev->base))
> > -		return PTR_ERR(dev->base);
> > -
> >  	dev->dev = &pdev->dev;
> >  	dev->irq = irq;
> >  	platform_set_drvdata(pdev, dev);
> >  
> > +	ret = dw_i2c_plat_request_regs(dev);
> > +	if (ret)
> > +		return ret;
> > +
> >  	dev->rst = devm_reset_control_get_optional_exclusive(&pdev->dev, NULL);
> >  	if (IS_ERR(dev->rst))
> >  		return PTR_ERR(dev->rst);
> > -- 
> > 2.26.2
> > 
> 
> -- 
> With Best Regards,
> Andy Shevchenko
> 
>