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Subject[PATCH 2/2] drm/rockchip: Convert the probe function to the generic drm_of_component_probe()
Date
Take two: Initial attempt to convert rockchip to drm_of_component_probe()
missed the difference between ports and encoders when using the
compare_of() function. Now that drm_of_component_probe() has been enhanced,
let's try again the conversion.

Signed-off-by: Liviu Dudau <Liviu.Dudau@arm.com>
---
drivers/gpu/drm/rockchip/rockchip_drm_drv.c | 98 ++++++-----------------------
1 file changed, 18 insertions(+), 80 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
index f22e1e1..581e98c 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
@@ -19,6 +19,7 @@
#include <drm/drmP.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_fb_helper.h>
+#include <drm/drm_of.h>
#include <linux/dma-mapping.h>
#include <linux/pm_runtime.h>
#include <linux/module.h>
@@ -411,36 +412,6 @@ int rockchip_drm_encoder_get_mux_id(struct device_node *node,
}
EXPORT_SYMBOL_GPL(rockchip_drm_encoder_get_mux_id);

-static int compare_of(struct device *dev, void *data)
-{
- struct device_node *np = data;
-
- return dev->of_node == np;
-}
-
-static void rockchip_add_endpoints(struct device *dev,
- struct component_match **match,
- struct device_node *port)
-{
- struct device_node *ep, *remote;
-
- for_each_child_of_node(port, ep) {
- remote = of_graph_get_remote_port_parent(ep);
- if (!remote || !of_device_is_available(remote)) {
- of_node_put(remote);
- continue;
- } else if (!of_device_is_available(remote->parent)) {
- dev_warn(dev, "parent device of %s is not available\n",
- remote->full_name);
- of_node_put(remote);
- continue;
- }
-
- component_match_add(dev, match, compare_of, remote);
- of_node_put(remote);
- }
-}
-
static int rockchip_drm_bind(struct device *dev)
{
struct drm_device *drm;
@@ -481,63 +452,30 @@ static const struct component_master_ops rockchip_drm_ops = {
.unbind = rockchip_drm_unbind,
};

-static int rockchip_drm_platform_probe(struct platform_device *pdev)
+static int compare_port(struct device *dev, void *data)
{
- struct device *dev = &pdev->dev;
- struct component_match *match = NULL;
- struct device_node *np = dev->of_node;
- struct device_node *port;
- int i;
+ struct device_node *np = data;

- if (!np)
- return -ENODEV;
- /*
- * Bind the crtc ports first, so that
- * drm_of_find_possible_crtcs called from encoder .bind callbacks
- * works as expected.
- */
- for (i = 0;; i++) {
- port = of_parse_phandle(np, "ports", i);
- if (!port)
- break;
-
- if (!of_device_is_available(port->parent)) {
- of_node_put(port);
- continue;
- }
+ return dev->parent->of_node == np;
+}

- component_match_add(dev, &match, compare_of, port->parent);
- of_node_put(port);
- }
+static int compare_encoder(struct device *dev, void *data)
+{
+ struct device_node *np = data;

- if (i == 0) {
- dev_err(dev, "missing 'ports' property\n");
- return -ENODEV;
- }
+ return dev->of_node == np;
+}

- if (!match) {
- dev_err(dev, "No available vop found for display-subsystem.\n");
- return -ENODEV;
- }
- /*
- * For each bound crtc, bind the encoders attached to its
- * remote endpoint.
- */
- for (i = 0;; i++) {
- port = of_parse_phandle(np, "ports", i);
- if (!port)
- break;
-
- if (!of_device_is_available(port->parent)) {
- of_node_put(port);
- continue;
- }
+static int rockchip_drm_platform_probe(struct platform_device *pdev)
+{
+ int ret = drm_of_component_probe(&pdev->dev, compare_port,
+ compare_encoder, &rockchip_drm_ops);

- rockchip_add_endpoints(dev, &match, port);
- of_node_put(port);
- }
+ /* keep compatibility with old code that was returning -ENODEV */
+ if (ret == -EINVAL)
+ return -ENODEV;

- return component_master_add_with_match(dev, &rockchip_drm_ops, match);
+ return ret;
}

static int rockchip_drm_platform_remove(struct platform_device *pdev)
--
2.6.0


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