[PATCH 03/12] driver: implement dev_platform_get_and_ioremap_resource

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

To simplify porting of Linux drivers that make use of this function, add
an implementation to barebox. This was so far not done, because AT91 has
I/O memory regions that conflict with the error pointers.

Therefore, we emit a warning if we run into such a conflict.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
 drivers/base/driver.c | 19 +++++++++++++++++++
 include/driver.h      |  4 ++++
 2 files changed, 23 insertions(+)

diff --git a/drivers/base/driver.c b/drivers/base/driver.c
index b2d428b70550..fbc5cbebe0ab 100644
--- a/drivers/base/driver.c
+++ b/drivers/base/driver.c
@@ -538,6 +538,25 @@ void __iomem *dev_request_mem_region_by_name(struct device *dev,
 }
 EXPORT_SYMBOL(dev_request_mem_region_by_name);
 
+void __iomem *dev_platform_get_and_ioremap_resource(struct device *dev,
+						    int num,
+						    struct resource **out_res)
+{
+	struct resource *res;
+
+	res = dev_request_mem_resource(dev, num);
+	if (IS_ERR(res))
+		return IOMEM_ERR_PTR(PTR_ERR(res));
+	else if (WARN_ON(IS_ERR_VALUE(res->start)))
+		return IOMEM_ERR_PTR(-EINVAL);
+
+	if (out_res)
+		*out_res = res;
+
+	return IOMEM(res->start);
+}
+EXPORT_SYMBOL(dev_platform_get_and_ioremap_resource);
+
 struct resource *dev_request_mem_resource(struct device *dev, int num)
 {
 	struct resource *res;
diff --git a/include/driver.h b/include/driver.h
index 7ff65d63946d..a61b9dca2285 100644
--- a/include/driver.h
+++ b/include/driver.h
@@ -289,6 +289,10 @@ struct resource *dev_request_mem_resource(struct device *dev, int num);
 struct resource *dev_request_mem_resource_by_name(struct device *dev,
 						  const char *name);
 
+void __iomem *dev_platform_get_and_ioremap_resource(struct device *dev,
+						    int num,
+						    struct resource **out_res);
+
 /*
  * exlusively request register base 'num' for a device
  * will return NULL on error
-- 
2.39.2