[RESEND PATCH v3 6/8] drivers: provide devm_platform_ioremap_resource_byname()

From: Bartosz Golaszewski <brgl@bgdev.pl>
To: Jonathan Corbet <corbet@lwn.net>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	"Rafael J . Wysocki" <rafael@kernel.org>,
	Arnd Bergmann <arnd@arndb.de>,
	Linus Walleij <linus.walleij@linaro.org>
Cc: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-gpio@vger.kernel.org,
	Bartosz Golaszewski <bgolaszewski@baylibre.com>
Subject: [RESEND PATCH v3 6/8] drivers: provide devm_platform_ioremap_resource_byname()
Date: Tue, 22 Oct 2019 10:43:16 +0200	[thread overview]
Message-ID: <20191022084318.22256-7-brgl@bgdev.pl> (raw)
In-Reply-To: <20191022084318.22256-1-brgl@bgdev.pl>

From: Bartosz Golaszewski <bgolaszewski@baylibre.com>

Provide a variant of devm_platform_ioremap_resource() that allows to
lookup resources from platform devices by name rather than by index.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
---
 .../driver-api/driver-model/devres.rst        |  1 +
 drivers/base/platform.c                       | 20 +++++++++++++++++++
 include/linux/platform_device.h               |  3 +++
 3 files changed, 24 insertions(+)

diff --git a/Documentation/driver-api/driver-model/devres.rst b/Documentation/driver-api/driver-model/devres.rst
index 480b78ca3871..4ab193319d8c 100644
--- a/Documentation/driver-api/driver-model/devres.rst
+++ b/Documentation/driver-api/driver-model/devres.rst
@@ -319,6 +319,7 @@ IOMAP
   devm_ioremap_resource_wc()
   devm_platform_ioremap_resource() : calls devm_ioremap_resource() for platform device
   devm_platform_ioremap_resource_wc()
+  devm_platform_ioremap_resource_byname()
   devm_iounmap()
   pcim_iomap()
   pcim_iomap_regions()	: do request_region() and iomap() on multiple BARs
diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 177010c27516..5cdd72a9e186 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -95,6 +95,26 @@ void __iomem *devm_platform_ioremap_resource_wc(struct platform_device *pdev,
 	res = platform_get_resource(pdev, IORESOURCE_MEM, index);
 	return devm_ioremap_resource_wc(&pdev->dev, res);
 }
+
+/**
+ * devm_platform_ioremap_resource_byname - call devm_ioremap_resource for
+ *					   a platform device, retrieve the
+ *					   resource by name
+ *
+ * @pdev: platform device to use both for memory resource lookup as well as
+ *	  resource management
+ * @name: name of the resource
+ */
+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 74cecb919e5c..43fe441a98ea 100644
--- a/include/linux/platform_device.h
+++ b/include/linux/platform_device.h
@@ -60,6 +60,9 @@ devm_platform_ioremap_resource(struct platform_device *pdev,
 extern void __iomem *
 devm_platform_ioremap_resource_wc(struct platform_device *pdev,
 				  unsigned int index);
+extern void __iomem *
+devm_platform_ioremap_resource_byname(struct platform_device *pdev,
+				      const char *name);
 extern int platform_get_irq(struct platform_device *, unsigned int);
 extern int platform_get_irq_optional(struct platform_device *, unsigned int);
 extern int platform_irq_count(struct platform_device *);
-- 
2.23.0

