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platform: Add platform_find_device_by_driver() helper 

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 <eric@anholt.net>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Heiko Stübner" <heiko@sntech.de>
Cc: Inki Dae <inki.dae@samsung.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Sandy Huang <hjc@rock-chips.com>
Cc: Seung-Woo Kim <sw0312.kim@samsung.com>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20190723221838.12024-8-suzuki.poulose@arm.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Suzuki K Poulose 2019-07-23 23:18:38 +01:00 committed by Greg Kroah-Hartman
parent 6bf85ba9e5
commit 36f3313d6b
6 changed files with 23 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
drivers/base/platform.c
View File

@ -1197,6 +1197,20 @@ struct bus_type platform_bus_type = {
}; };
EXPORT_SYMBOL_GPL(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 __init platform_bus_init(void)
{ {
int error; int error;

9
drivers/gpu/drm/exynos/exynos_drm_drv.c
View File

@ -242,9 +242,7 @@ static struct component_match *exynos_drm_match_add(struct device *dev)
if (!info->driver || !(info->flags & DRM_COMPONENT_DRIVER)) if (!info->driver || !(info->flags & DRM_COMPONENT_DRIVER))
continue; continue;
while ((d = bus_find_device(&platform_bus_type, p, while ((d = platform_find_device_by_driver(p, &info->driver->driver))) {
&info->driver->driver,
(void *)platform_bus_type.match))) {
put_device(p); put_device(p);
if (!(info->flags & DRM_FIMC_DEVICE) || if (!(info->flags & DRM_FIMC_DEVICE) ||
@ -412,9 +410,8 @@ static void exynos_drm_unregister_devices(void)
if (!info->driver || !(info->flags & DRM_VIRTUAL_DEVICE)) if (!info->driver || !(info->flags & DRM_VIRTUAL_DEVICE))
continue; continue;
while ((dev = bus_find_device(&platform_bus_type, NULL, while ((dev = platform_find_device_by_driver(NULL,
&info->driver->driver, &info->driver->driver))) {
(void *)platform_bus_type.match))) {
put_device(dev); put_device(dev);
platform_device_unregister(to_platform_device(dev)); platform_device_unregister(to_platform_device(dev));
} }

3
drivers/gpu/drm/mcde/mcde_drv.c
View File

@ -477,8 +477,7 @@ static int mcde_probe(struct platform_device *pdev)
struct device_driver *drv = &mcde_component_drivers[i]->driver; struct device_driver *drv = &mcde_component_drivers[i]->driver;
struct device *p = NULL, *d; struct device *p = NULL, *d;
while ((d = bus_find_device(&platform_bus_type, p, drv, while ((d = platform_find_device_by_driver(p, drv))) {
(void *)platform_bus_type.match))) {
put_device(p); put_device(p);
component_match_add(dev, &match, mcde_compare_dev, d); component_match_add(dev, &match, mcde_compare_dev, d);
p = d; p = d;

3
drivers/gpu/drm/rockchip/rockchip_drm_drv.c
View File

@ -330,8 +330,7 @@ static struct component_match *rockchip_drm_match_add(struct device *dev)
struct device *p = NULL, *d; struct device *p = NULL, *d;
do { do {
d = bus_find_device(&platform_bus_type, p, &drv->driver, d = platform_find_device_by_driver(p, &drv->driver);
(void *)platform_bus_type.match);
put_device(p); put_device(p);
p = d; p = d;

3
drivers/gpu/drm/vc4/vc4_drv.c
View File

@ -237,8 +237,7 @@ static void vc4_match_add_drivers(struct device *dev,
struct device_driver *drv = &drivers[i]->driver; struct device_driver *drv = &drivers[i]->driver;
struct device *p = NULL, *d; struct device *p = NULL, *d;
while ((d = bus_find_device(&platform_bus_type, p, drv, while ((d = platform_find_device_by_driver(p, drv))) {
(void *)platform_bus_type.match))) {
put_device(p); put_device(p);
component_match_add(dev, match, compare_dev, d); component_match_add(dev, match, compare_dev, d);
p = d; p = d;

3
include/linux/platform_device.h
View File

@ -51,6 +51,9 @@ extern struct device platform_bus;
extern void arch_setup_pdev_archdata(struct platform_device *); extern void arch_setup_pdev_archdata(struct platform_device *);
extern struct resource *platform_get_resource(struct platform_device *, extern struct resource *platform_get_resource(struct platform_device *,
unsigned int, unsigned int); unsigned int, unsigned int);
extern struct device *
platform_find_device_by_driver(struct device *start,
const struct device_driver *drv);
extern void __iomem * extern void __iomem *
devm_platform_ioremap_resource(struct platform_device *pdev, devm_platform_ioremap_resource(struct platform_device *pdev,
unsigned int index); unsigned int index);