Provide a helper to lookup platform devices by matching device
driver in order to avoid drivers trying to use platform bus
internals.
Cc: Eric Anholt <e...@anholt.net>
Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org>
Cc: "Heiko Stübner" <he...@sntech.de>
Cc: Inki Dae <inki....@samsung.com>
Cc: "Rafael J. Wysocki" <raf...@kernel.org>
Cc: Sandy Huang <h...@rock-chips.com>
Cc: Seung-Woo Kim <sw0312....@samsung.com>
Signed-off-by: Suzuki K Poulose <suzuki.poul...@arm.com>
---
drivers/base/platform.c | 14 ++++++++++++++
include/linux/platform_device.h | 3 +++
2 files changed, 17 insertions(+)
diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 4d17298..158ac24 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -1197,6 +1197,20 @@ struct bus_type platform_bus_type = {
};
EXPORT_SYMBOL_GPL(platform_bus_type);
+/**
+ * platform_find_device_by_driver - Find a platform device with a given
+ * driver.
+ * @start: The device to start the search from.
+ * @drv: The device driver to look for.
+ */
+struct device *platform_find_device_by_driver(struct device *start,
+ const struct device_driver *drv)
+{
+ return bus_find_device(&platform_bus_type, start, drv,
+ (void *)platform_match);
+}
+EXPORT_SYMBOL_GPL(platform_find_device_by_driver);
+
int __init platform_bus_init(void)
{
int error;
diff --git a/include/linux/platform_device.h b/include/linux/platform_device.h
index cc46485..36aa775 100644
--- a/include/linux/platform_device.h
+++ b/include/linux/platform_device.h
@@ -52,6 +52,9 @@ extern struct device platform_bus;
extern void arch_setup_pdev_archdata(struct platform_device *);
extern struct resource *platform_get_resource(struct platform_device *,
unsigned int, unsigned int);
+extern struct device *
+platform_find_device_by_driver(struct device * dev,
+ const struct device_driver *drv);
extern void __iomem *
devm_platform_ioremap_resource(struct platform_device *pdev,
unsigned int index);
--
2.7.4
