This is a really nice way to handle the component setup. The
subsystem driver knows that it's got a bunch of component drivers, and
for any devices that matched its component drivers, it wants all of
those to bind to it as master.
Signed-off-by: Eric Anholt <eric@xxxxxxxxxx>
---
v2: Extend the kerneldoc.
drivers/gpu/drm/drm_platform_helper.c | 40 +++++++++++++++++++++++++++++++++
drivers/gpu/drm/exynos/exynos_drm_drv.c | 37 ++++++------------------------
include/drm/drmP.h | 5 +++++
3 files changed, 52 insertions(+), 30 deletions(-)
diff --git a/drivers/gpu/drm/drm_platform_helper.c b/drivers/gpu/drm/drm_platform_helper.c
index 450846f..c4f03541 100644
--- a/drivers/gpu/drm/drm_platform_helper.c
+++ b/drivers/gpu/drm/drm_platform_helper.c
@@ -7,6 +7,7 @@
* option) any later version.
*/
+#include <linux/component.h>
#include <drm/drmP.h>
/**
@@ -51,3 +52,42 @@ void drm_platform_unregister_drivers(struct platform_driver *const *drv,
platform_driver_unregister(drv[count]);
}
EXPORT_SYMBOL_GPL(drm_platform_unregister_drivers);
+
+static int compare_dev(struct device *dev, void *data)
+{
+ return dev == (struct device *)data;
+}
+
+/**
+ * drm_platform_component_match_add_drivers - For each driver passed
+ * in, finds each device that probed with it and adds it as a component
+ * driver to the match list.
+ * @dev: master device for the components
+ * @match: pointer to the match structure pointer. For the first
+ * component_match_add(), this should be a pointer to a NULL
+ * pointer, which will get filled in by the call.
+ * @drivers: array of platform drivers whose devices should all be
+ * added to the match
+ * @count: number of platform drivers to match
+ */
+void drm_platform_component_match_add_drivers(struct device *dev,
+ struct component_match **match,
+ struct platform_driver *const *drivers,
+ int count)
+{
+ int i;
+
+ for (i = 0; i < count; i++) {
+ struct device_driver *drv = &drivers[i]->driver;
+ struct device *p = NULL, *d;
+
+ while ((d = bus_find_device(&platform_bus_type, p, drv,
+ (void *)platform_bus_type.match))) {
+ put_device(p);
+ component_match_add(dev, match, compare_dev, d);
+ p = d;
+ }
+ put_device(p);
+ }
+}
+EXPORT_SYMBOL_GPL(drm_platform_component_match_add_drivers);
diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.c b/drivers/gpu/drm/exynos/exynos_drm_drv.c
index 83f829b..9151304 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_drv.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_drv.c
@@ -412,32 +412,6 @@ static struct platform_driver *const exynos_drm_drv_with_simple_dev[] = {
};
#define PDEV_COUNT ARRAY_SIZE(exynos_drm_drv_with_simple_dev)
-static int compare_dev(struct device *dev, void *data)
-{
- return dev == (struct device *)data;
-}
-
-static struct component_match *exynos_drm_match_add(struct device *dev)
-{
- struct component_match *match = NULL;
- int i;
-
- for (i = 0; i < ARRAY_SIZE(exynos_drm_kms_drivers); ++i) {
- struct device_driver *drv = &exynos_drm_kms_drivers[i]->driver;
- struct device *p = NULL, *d;
-
- while ((d = bus_find_device(&platform_bus_type, p, drv,
- (void *)platform_bus_type.match))) {
- put_device(p);
- component_match_add(dev, &match, compare_dev, d);
- p = d;
- }
- put_device(p);
- }
-
- return match ?: ERR_PTR(-ENODEV);
-}
-
static int exynos_drm_bind(struct device *dev)
{
return drm_platform_init(&exynos_drm_driver, to_platform_device(dev));
@@ -455,14 +429,17 @@ static const struct component_master_ops exynos_drm_ops = {
static int exynos_drm_platform_probe(struct platform_device *pdev)
{
- struct component_match *match;
+ struct component_match *match = NULL;
pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
exynos_drm_driver.num_ioctls = ARRAY_SIZE(exynos_ioctls);
- match = exynos_drm_match_add(&pdev->dev);
- if (IS_ERR(match))
- return PTR_ERR(match);
+ drm_platform_component_match_add_drivers(&pdev->dev, &match,
+ exynos_drm_kms_drivers,
+ ARRAY_SIZE(exynos_drm_kms_drivers));
+
+ if (!match)
+ return -ENODEV;
return component_master_add_with_match(&pdev->dev, &exynos_drm_ops,
match);
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index a774574..b65d886 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -88,6 +88,7 @@ struct device_node;
struct videomode;
struct reservation_object;
struct dma_buf_attachment;
+struct component_match;
/*
* 4 debug categories are defined:
@@ -1091,6 +1092,10 @@ int drm_platform_register_drivers(struct platform_driver *const *drv,
int count);
void drm_platform_unregister_drivers(struct platform_driver *const *drv,
int count);
+void drm_platform_component_match_add_drivers(struct device *dev,
+ struct component_match **match,
+ struct platform_driver **drivers,
+ int count);
/* returns true if currently okay to sleep */
static __inline__ bool drm_can_sleep(void)
--
2.1.4
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