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Subject[PATCH v2 4/5] drivers: platform: provide devm_platform_ioremap_resource_wc()
Date
From: Bartosz Golaszewski <bgolaszewski@baylibre.com>

Provide a write-combined variant of devm_platform_ioremap_resource().

While at it: in order not to duplicate code - pass the resource
retrieved by platform_get_resource() directly to the appropriate
devm_ioremap_resource() variant.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
---
.../driver-api/driver-model/devres.rst | 1 +
drivers/base/platform.c | 27 +++++++++++++++----
include/linux/platform_device.h | 3 +++
3 files changed, 26 insertions(+), 5 deletions(-)

diff --git a/Documentation/driver-api/driver-model/devres.rst b/Documentation/driver-api/driver-model/devres.rst
index e605bb9df6e1..480b78ca3871 100644
--- a/Documentation/driver-api/driver-model/devres.rst
+++ b/Documentation/driver-api/driver-model/devres.rst
@@ -318,6 +318,7 @@ IOMAP
devm_ioremap_resource() : checks resource, requests memory region, ioremaps
devm_ioremap_resource_wc()
devm_platform_ioremap_resource() : calls devm_ioremap_resource() for platform device
+ devm_platform_ioremap_resource_wc()
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 b6c6c7d97d5b..8fdf3eb23bda 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
@@ -68,16 +69,32 @@ 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)
{
- struct resource *res;
-
- res = platform_get_resource(pdev, IORESOURCE_MEM, index);
- return devm_ioremap_resource(&pdev->dev, res);
+ return devm_ioremap_resource(&pdev->dev,
+ platform_get_resource(pdev,
+ IORESOURCE_MEM,
+ index));
}
EXPORT_SYMBOL_GPL(devm_platform_ioremap_resource);
+
+/**
+ * devm_platform_ioremap_resource_wc - write-combined variant of
+ * devm_platform_ioremap_resource()
+ *
+ * @pdev: platform device to use both for memory resource lookup as well as
+ * resource management
+ * @index: resource index
+ */
+void __iomem *devm_platform_ioremap_resource_wc(struct platform_device *pdev,
+ unsigned int index)
+{
+ return devm_ioremap_resource_wc(&pdev->dev,
+ platform_get_resource(pdev,
+ IORESOURCE_MEM,
+ index));
+}
#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..83930790c701 100644
--- a/include/linux/platform_device.h
+++ b/include/linux/platform_device.h
@@ -57,6 +57,9 @@ platform_find_device_by_driver(struct device *start,
extern void __iomem *
devm_platform_ioremap_resource(struct platform_device *pdev,
unsigned int index);
+extern void __iomem *
+devm_platform_ioremap_resource_wc(struct platform_device *pdev,
+ unsigned int index);
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
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