linux-kernel - [RESEND PATCH v3 3/8] lib: devres: provide devm_ioremap_resource

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Date:   Tue, 22 Oct 2019 10:43:13 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Jonathan Corbet <corbet@....net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Linus Walleij <linus.walleij@...aro.org>
Cc:     linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-gpio@...r.kernel.org,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: [RESEND PATCH v3 3/8] lib: devres: provide devm_ioremap_resource_wc()

From: Bartosz Golaszewski <bgolaszewski@...libre.com>

Provide a variant of devm_ioremap_resource() for write-combined ioremap.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
Reviewed-by: Arnd Bergmann <arnd@...db.de>
---
 Documentation/driver-api/driver-model/devres.rst |  1 +
 include/linux/device.h                           |  2 ++
 lib/devres.c                                     | 15 +++++++++++++++
 3 files changed, 18 insertions(+)

diff --git a/Documentation/driver-api/driver-model/devres.rst b/Documentation/driver-api/driver-model/devres.rst
index 8e3087662daf..e605bb9df6e1 100644
--- a/Documentation/driver-api/driver-model/devres.rst
+++ b/Documentation/driver-api/driver-model/devres.rst
@@ -316,6 +316,7 @@ IOMAP
   devm_ioremap_nocache()
   devm_ioremap_wc()
   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_iounmap()
   pcim_iomap()
diff --git a/include/linux/device.h b/include/linux/device.h
index 297239a08bb7..1f4aaf2d4b2a 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -946,6 +946,8 @@ extern void devm_free_pages(struct device *dev, unsigned long addr);
 
 void __iomem *devm_ioremap_resource(struct device *dev,
 				    const struct resource *res);
+void __iomem *devm_ioremap_resource_wc(struct device *dev,
+				       const struct resource *res);
 
 void __iomem *devm_of_iomap(struct device *dev,
 			    struct device_node *node, int index,
diff --git a/lib/devres.c b/lib/devres.c
index a14c727128c1..97fb44e5b4d6 100644
--- a/lib/devres.c
+++ b/lib/devres.c
@@ -169,6 +169,21 @@ void __iomem *devm_ioremap_resource(struct device *dev,
 }
 EXPORT_SYMBOL(devm_ioremap_resource);
 
+/**
+ * devm_ioremap_resource_wc() - write-combined variant of
+ *				devm_ioremap_resource()
+ * @dev: generic device to handle the resource for
+ * @res: resource to be handled
+ *
+ * Returns a pointer to the remapped memory or an ERR_PTR() encoded error code
+ * on failure. Usage example:
+ */
+void __iomem *devm_ioremap_resource_wc(struct device *dev,
+				       const struct resource *res)
+{
+	return __devm_ioremap_resource(dev, res, DEVM_IOREMAP_WC);
+}
+
 /*
  * devm_of_iomap - Requests a resource and maps the memory mapped IO
  *		   for a given device_node managed by a given device
-- 
2.23.0