Re: [PATCH v2 1/4] drivers: provide devm_platform_get_and_ioremap_resource_byname()

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On 13/09/2024 10:29, Andrei Stefanescu wrote:
Similar to commit 890cc39a879906b63912482dfc41944579df2dc6
("drivers: provide devm_platform_get_and_ioremap_resource()")
add a wrapper for "platform_get_resource_byname" and
"devm_ioremap_resource". This new wrapper also returns the resource, if
any, via a pointer.

Suggested-by: Krzysztof Kozlowski <krzk@xxxxxxxxxx>
Signed-off-by: Andrei Stefanescu <andrei.stefanescu@xxxxxxxxxxx> > ---
  drivers/base/platform.c         | 28 ++++++++++++++++++++++++++++
  include/linux/platform_device.h | 13 +++++++++++++
  2 files changed, 41 insertions(+)

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 4c3ee6521ba5..ab48c02fcb2c 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -108,6 +108,34 @@ devm_platform_get_and_ioremap_resource(struct platform_device *pdev,
  }
  EXPORT_SYMBOL_GPL(devm_platform_get_and_ioremap_resource);
+/**
+ * devm_platform_get_and_ioremap_resource_byname - call devm_ioremap_resource()
+ *					    for a platform device and get
+ *					    a resource by its name instead
+ *					    of the index

I think we don't need to describe what the function does not do.

With that:
Reviewed-by: Matthias Brugger <mbrugger@xxxxxxxx>

+ *
+ * @pdev: platform device to use both for memory resource lookup as well as
+ *        resource management
+ * @name: resource name
+ * @res: optional output parameter to store a pointer to the obtained resource.
+ *
+ * Return: a pointer to the remapped memory or an ERR_PTR() encoded error code
+ * on failure.
+ */
+void __iomem *
+devm_platform_get_and_ioremap_resource_byname(struct platform_device *pdev,
+					      const char *name,
+					      struct resource **res)
+{
+	struct resource *r;
+
+	r = platform_get_resource_byname(pdev, IORESOURCE_MEM, name);
+	if (res)
+		*res = r;
+	return devm_ioremap_resource(&pdev->dev, r);
+}
+EXPORT_SYMBOL_GPL(devm_platform_get_and_ioremap_resource_byname);
+
  /**
   * devm_platform_ioremap_resource - call devm_ioremap_resource() for a platform
   *				    device
diff --git a/include/linux/platform_device.h b/include/linux/platform_device.h
index d422db6eec63..ab7f33f3c426 100644
--- a/include/linux/platform_device.h
+++ b/include/linux/platform_device.h
@@ -68,6 +68,12 @@ platform_find_device_by_driver(struct device *start,
  extern void __iomem *
  devm_platform_get_and_ioremap_resource(struct platform_device *pdev,
  				unsigned int index, struct resource **res);
+
+extern void __iomem *
+devm_platform_get_and_ioremap_resource_byname(struct platform_device *pdev,
+					      const char *name,
+					      struct resource **res);
+
  extern void __iomem *
  devm_platform_ioremap_resource(struct platform_device *pdev,
  			       unsigned int index);
@@ -83,6 +89,13 @@ devm_platform_get_and_ioremap_resource(struct platform_device *pdev,
  	return ERR_PTR(-EINVAL);
  }
+static inline void __iomem *
+devm_platform_get_and_ioremap_resource_byname(struct platform_device *pdev,
+					      const char *name,
+					      struct resource **res)
+{
+	return ERR_PTR(-EINVAL);
+}
static inline void __iomem *
  devm_platform_ioremap_resource(struct platform_device *pdev,




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