linux-kernel - [PATCH 1/2] lib: devres: provide devm_ioremap_resource

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Date:   Sun, 29 Dec 2019 10:43:23 +0000
From:   Yangtao Li <tiny.windzz@...il.com>
To:     corbet@....net, gregkh@...uxfoundation.org,
        bgolaszewski@...libre.com, arnd@...db.de, sboyd@...nel.org,
        mchehab+samsung@...nel.org, matti.vaittinen@...rohmeurope.com,
        phil.edworthy@...esas.com, suzuki.poulose@....com,
        saravanak@...gle.com, heikki.krogerus@...ux.intel.com,
        dan.j.williams@...el.com, joe@...ches.com,
        jeffrey.t.kirsher@...el.com, mans@...sr.com, tglx@...utronix.de,
        hdegoede@...hat.com, akpm@...ux-foundation.org,
        ulf.hansson@...aro.org, ztuowen@...il.com,
        sergei.shtylyov@...entembedded.com, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Yangtao Li <tiny.windzz@...il.com>
Subject: [PATCH 1/2] lib: devres: provide devm_ioremap_resource_nocache()

Provide a variant of devm_ioremap_resource() for nocache ioremap.

Signed-off-by: Yangtao Li <tiny.windzz@...il.com>
---
 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 13046fcf0a5d..af1b1b9e3a17 100644
--- a/Documentation/driver-api/driver-model/devres.rst
+++ b/Documentation/driver-api/driver-model/devres.rst
@@ -317,6 +317,7 @@ IOMAP
   devm_ioremap_uc()
   devm_ioremap_wc()
   devm_ioremap_resource() : checks resource, requests memory region, ioremaps
+  devm_ioremap_resource_nocache()
   devm_ioremap_resource_wc()
   devm_platform_ioremap_resource() : calls devm_ioremap_resource() for platform device
   devm_platform_ioremap_resource_wc()
diff --git a/include/linux/device.h b/include/linux/device.h
index 96ff76731e93..3aa353aa52e2 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -962,6 +962,8 @@ 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_nocache(struct device *dev,
+					    const struct resource *res);
 void __iomem *devm_ioremap_resource_wc(struct device *dev,
 				       const struct resource *res);
 
diff --git a/lib/devres.c b/lib/devres.c
index f56070cf970b..a182f8479fbf 100644
--- a/lib/devres.c
+++ b/lib/devres.c
@@ -188,6 +188,21 @@ void __iomem *devm_ioremap_resource(struct device *dev,
 }
 EXPORT_SYMBOL(devm_ioremap_resource);
 
+/**
+ * devm_ioremap_resource_nocache() - nocache 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.
+ */
+void __iomem *devm_ioremap_resource_nocache(struct device *dev,
+					    const struct resource *res)
+{
+	return __devm_ioremap_resource(dev, res, DEVM_IOREMAP_NC);
+}
+
 /**
  * devm_ioremap_resource_wc() - write-combined variant of
  *				devm_ioremap_resource()
-- 
2.17.1