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gpu: host1x: Support sub-devices recursively 

The display architecture in Tegra186 changes slightly compared to
earlier Tegra generations, which requires that we recursively scan
host1x sub-devices from device tree.

Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Thierry Reding 2017-08-15 15:46:22 +02:00
parent 7b2c63de20
commit 25ae30d2a8
1 changed files with 17 additions and 1 deletions
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18
drivers/gpu/host1x/bus.c
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@ -45,9 +45,12 @@ struct host1x_subdev {
* @np: device node
*/
static int host1x_subdev_add(struct host1x_device *device,
struct host1x_driver *driver,
struct device_node *np)
{
struct host1x_subdev *subdev;
struct device_node *child;
int err;
subdev = kzalloc(sizeof(*subdev), GFP_KERNEL);
if (!subdev)
@ -60,6 +63,19 @@ static int host1x_subdev_add(struct host1x_device *device,
list_add_tail(&subdev->list, &device->subdevs);
mutex_unlock(&device->subdevs_lock);
/* recursively add children */
for_each_child_of_node(np, child) {
if (of_match_node(driver->subdevs, child) &&
of_device_is_available(child)) {
err = host1x_subdev_add(device, driver, child);
if (err < 0) {
/* XXX cleanup? */
of_node_put(child);
return err;
}
}
}
return 0;
}
@ -88,7 +104,7 @@ static int host1x_device_parse_dt(struct host1x_device *device,
for_each_child_of_node(device->dev.parent->of_node, np) {
if (of_match_node(driver->subdevs, np) &&
of_device_is_available(np)) {
err = host1x_subdev_add(device, np);
err = host1x_subdev_add(device, driver, np);
if (err < 0) {
of_node_put(np);
return err;