linux-kernel - [PATCH v2 1/4] drivers: provide devm_platform_get_and_ioremap_resource

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Message-ID: <20240913082937.444367-2-andrei.stefanescu@oss.nxp.com>
Date: Fri, 13 Sep 2024 11:29:32 +0300
From: Andrei Stefanescu <andrei.stefanescu@....nxp.com>
To: Linus Walleij <linus.walleij@...aro.org>,
	Bartosz Golaszewski <brgl@...ev.pl>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Chester Lin <chester62515@...il.com>,
	Matthias Brugger <mbrugger@...e.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>
Cc: linux-gpio@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	NXP S32 Linux Team <s32@....com>,
	Andrei Stefanescu <andrei.stefanescu@....nxp.com>,
	Krzysztof Kozlowski <krzk@...nel.org>
Subject: [PATCH v2 1/4] drivers: provide devm_platform_get_and_ioremap_resource_byname()

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@...nel.org>
Signed-off-by: Andrei Stefanescu <andrei.stefanescu@....nxp.com>
---
 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
+ *
+ * @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,
-- 
2.45.2