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

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Message-ID: <CAMpxmJUQjyCeNvczx_UKNL6PMnNWAPsY5ptCdz24YLXH_63nRg@mail.gmail.com>
Date:   Sun, 29 Dec 2019 13:13:56 +0100
From:   Bartosz Golaszewski <bgolaszewski@...libre.com>
To:     Frank Lee <tiny.windzz@...il.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Srini Kandagatla <srinivas.kandagatla@...aro.org>,
        Vladimir Zapolskiy <vz@...ia.com>,
        Kevin Hilman <khilman@...libre.com>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        mans@...sr.com, treding@...dia.com, suzuki.poulose@....com,
        Thomas Gleixner <tglx@...utronix.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-amlogic@...ts.infradead.org
Subject: Re: [PATCH] drivers: add devm_platform_ioremap_resource_byname() helper

sob., 28 gru 2019 o 18:39 Frank Lee <tiny.windzz@...il.com> napisał(a):
>
> ping...
>
> On Wed, Dec 11, 2019 at 4:31 AM Yangtao Li <tiny.windzz@...il.com> wrote:
> >
> > There are currently 300+ instances of using platform_get_resource_byname()
> > and devm_ioremap_resource() together in the kernel tree.
> >
> > This patch wraps these two calls in a single helper.
> >
> > Signed-off-by: Yangtao Li <tiny.windzz@...il.com>
> > ---
> >  drivers/base/platform.c         | 22 +++++++++++++++++++++-
> >  include/linux/platform_device.h |  3 +++
> >  2 files changed, 24 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/base/platform.c b/drivers/base/platform.c
> > index b6c6c7d97d5b..9c4f5e229600 100644
> > --- a/drivers/base/platform.c
> > +++ b/drivers/base/platform.c
> > @@ -60,6 +60,7 @@ struct resource *platform_get_resource(struct platform_device *dev,
> >  }
> >  EXPORT_SYMBOL_GPL(platform_get_resource);
> >
> > +#ifdef CONFIG_HAS_IOMEM
> >  /**
> >   * devm_platform_ioremap_resource - call devm_ioremap_resource() for a platform
> >   *                                 device
> > @@ -68,7 +69,7 @@ EXPORT_SYMBOL_GPL(platform_get_resource);
> >   *        resource management
> >   * @index: resource index
> >   */
> > -#ifdef CONFIG_HAS_IOMEM
> > +
> >  void __iomem *devm_platform_ioremap_resource(struct platform_device *pdev,
> >                                              unsigned int index)
> >  {
> > @@ -78,6 +79,25 @@ 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 managemend
> > + * @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 */
> >
> >  static int __platform_get_irq(struct platform_device *dev, unsigned int num)
> > diff --git a/include/linux/platform_device.h b/include/linux/platform_device.h
> > index 1b5cec067533..24ff5da9c532 100644
> > --- a/include/linux/platform_device.h
> > +++ b/include/linux/platform_device.h
> > @@ -63,6 +63,9 @@ extern int platform_irq_count(struct platform_device *);
> >  extern struct resource *platform_get_resource_byname(struct platform_device *,
> >                                                      unsigned int,
> >                                                      const char *);
> > +extern void __iomem *
> > +devm_platform_ioremap_resource_byname(struct platform_device *pdev,
> > +                                     const char *name);
> >  extern int platform_get_irq_byname(struct platform_device *, const char *);
> >  extern int platform_add_devices(struct platform_device **, int);
> >
> > --
> > 2.17.1
> >

This exact routine has existed upstream since commit c9c8641d3ebd
("drivers: provide devm_platform_ioremap_resource_byname()"). What
version are you working on?

Bart