From: Bartosz Golaszewski <bgolaszew...@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 <bgolaszew...@baylibre.com>
Reviewed-by: Arnd Bergmann <a...@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
