linux-kernel - Re: [PATCH] drivers: Provide devm_platform_ioremap_resource

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Date:   Fri, 14 Jun 2019 16:10:04 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Markus Elfring <Markus.Elfring@....de>,
        Jack Ping CHNG <jack.ping.chng@...ux.intel.com>,
        kernel-janitors@...r.kernel.org,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Enrico Weigelt <lkml@...ux.net>,
        Himanshu Jha <himanshujha199640@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCH] drivers: Provide devm_platform_ioremap_resource_byname()

On Fri, Jun 14, 2019 at 04:38:40PM +0300, Andy Shevchenko wrote:
> +Cc: Jack Ping, who did internally the same
> 
> On Fri, Jun 14, 2019 at 03:26:25PM +0200, Markus Elfring wrote:
> > From: Markus Elfring <elfring@...rs.sourceforge.net>
> > Date: Fri, 14 Jun 2019 15:15:14 +0200
> > 
> > The functions “platform_get_resource_byname” and “devm_ioremap_resource”
> > are called together in 181 source files.
> > This implementation detail can be determined also with the help
> > of the semantic patch language (Coccinelle software).
> > 
> > Wrap these two calls into another helper function.
> > Thus a local variable does not need to be declared for a resource
> > structure pointer before and a redundant argument can be omitted
> > for the resource type.
> 
> This one makes sense.
> Though I'm not sure Greg will see your message.

Nope, didn't see it, don't want to see it, it will only cause more work
in the longrun...

> Rafael, maybe you can apply this one?

Um, don't go around maintainers please, that's rude.  There is a reason
this specific developer is in my blacklist, and perhaps they should be
in yours as well :)

> FWIW,
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> 
> > 
> > Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
> > ---
> >  drivers/base/platform.c | 18 ++++++++++++++++++
> >  1 file changed, 18 insertions(+)
> > 
> > diff --git a/drivers/base/platform.c b/drivers/base/platform.c
> > index 4d1729853d1a..c1f19a479dd7 100644
> > --- a/drivers/base/platform.c
> > +++ b/drivers/base/platform.c
> > @@ -97,6 +97,24 @@ void __iomem *devm_platform_ioremap_resource(struct platform_device *pdev,
> >  	return devm_ioremap_resource(&pdev->dev, res);
> >  }
> >  EXPORT_SYMBOL_GPL(devm_platform_ioremap_resource);
> > +
> > +/**
> > + * devm_platform_ioremap_resource_byname
> > + * Call devm_ioremap_resource() for a platform device
> > + *
> > + * @pdev: platform device to use both for memory resource lookup as well as
> > + *        resource management
> > + * @name: resource name
> > + */
> > +void __iomem *devm_platform_ioremap_resource_byname(struct platform_device *pdev,
> > +						    const char *name)
> > +{
> > +	struct resource *res;
> > +
> > +	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, name);
> > +	return devm_ioremap_resource(&pdev->dev, res);
> > +}
> > +EXPORT_SYMBOL_GPL(devm_platform_ioremap_resource_byname);
> >  #endif /* CONFIG_HAS_IOMEM */

I don't like adding new apis with no user.

thanks,

greg k-h