[PATCH v2 03/12] drm: bridge: samsung-dsim: Handle platform init via driver_data

[Jagan Teki <jagan@xxxxxxxxxxxxxxxxxxxx>]

In order to make a common Samsung DSIM bridge driver some platform
specific glue code needs to maintain separately as it is hard to
maintain platform specific glue and conventional component_ops on
the drm bridge drivers side.

This patch is trying to support that glue code initialization in
the form of platform_init flag in driver_data.

So, the platforms which enable platform_init flags will handle all
platform specific initialization via samsung_dsim_plat_probe.

The Platform probe is responsible to
- initialize samsung_dsim_plat_data and install hooks
- initialize component_ops
- preserve samsung_dsim structure pointer

v2:
* fix samsung_dsim_plat_probe return pointer

v1:
* use platform_init instead of exynos_specific
* handle component_ops in glue code

Signed-off-by: Jagan Teki <jagan@xxxxxxxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/bridge/samsung-dsim.c | 22 +++++++++++++++++-----
 include/drm/bridge/samsung-dsim.h     |  1 +
 2 files changed, 18 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/bridge/samsung-dsim.c b/drivers/gpu/drm/bridge/samsung-dsim.c
index f23f06d55158..99f80e9c1600 100644
--- a/drivers/gpu/drm/bridge/samsung-dsim.c
+++ b/drivers/gpu/drm/bridge/samsung-dsim.c
@@ -370,6 +370,7 @@ static const struct samsung_dsim_driver_data exynos3_dsi_driver_data = {
 	.wait_for_reset = 1,
 	.num_bits_resol = 11,
 	.reg_values = reg_values,
+	.platform_init = true,
 };
 
 static const struct samsung_dsim_driver_data exynos4_dsi_driver_data = {
@@ -382,6 +383,7 @@ static const struct samsung_dsim_driver_data exynos4_dsi_driver_data = {
 	.wait_for_reset = 1,
 	.num_bits_resol = 11,
 	.reg_values = reg_values,
+	.platform_init = true,
 };
 
 static const struct samsung_dsim_driver_data exynos5_dsi_driver_data = {
@@ -392,6 +394,7 @@ static const struct samsung_dsim_driver_data exynos5_dsi_driver_data = {
 	.wait_for_reset = 1,
 	.num_bits_resol = 11,
 	.reg_values = reg_values,
+	.platform_init = true,
 };
 
 static const struct samsung_dsim_driver_data exynos5433_dsi_driver_data = {
@@ -403,6 +406,7 @@ static const struct samsung_dsim_driver_data exynos5433_dsi_driver_data = {
 	.wait_for_reset = 0,
 	.num_bits_resol = 12,
 	.reg_values = exynos5433_reg_values,
+	.platform_init = true,
 };
 
 static const struct samsung_dsim_driver_data exynos5422_dsi_driver_data = {
@@ -414,6 +418,7 @@ static const struct samsung_dsim_driver_data exynos5422_dsi_driver_data = {
 	.wait_for_reset = 1,
 	.num_bits_resol = 12,
 	.reg_values = exynos5422_reg_values,
+	.platform_init = true,
 };
 
 static const struct of_device_id samsung_dsim_of_match[] = {
@@ -1610,12 +1615,16 @@ static int samsung_dsim_probe(struct platform_device *pdev)
 	dsi->bridge.of_node = dev->of_node;
 	dsi->bridge.type = DRM_MODE_CONNECTOR_DSI;
 
-	dsi->plat_data = samsung_dsim_plat_probe(dsi);
-	if (IS_ERR(dsi->plat_data)) {
-		ret = PTR_ERR(dsi->plat_data);
-		goto err_disable_runtime;
+	if (dsi->driver_data->platform_init) {
+		dsi->plat_data = samsung_dsim_plat_probe(dsi);
+		ret = IS_ERR(dsi->plat_data) ? PTR_ERR(dsi->plat_data) : 0;
+	} else {
+		ret = mipi_dsi_host_register(&dsi->dsi_host);
 	}
 
+	if (ret)
+		goto err_disable_runtime;
+
 	return 0;
 
 err_disable_runtime:
@@ -1630,7 +1639,10 @@ static int samsung_dsim_remove(struct platform_device *pdev)
 
 	pm_runtime_disable(&pdev->dev);
 
-	samsung_dsim_plat_remove(dsi);
+	if (dsi->driver_data->platform_init)
+		samsung_dsim_plat_remove(dsi);
+	else
+		mipi_dsi_host_unregister(&dsi->dsi_host);
 
 	return 0;
 }
diff --git a/include/drm/bridge/samsung-dsim.h b/include/drm/bridge/samsung-dsim.h
index 5cf8570ac978..70224d20414b 100644
--- a/include/drm/bridge/samsung-dsim.h
+++ b/include/drm/bridge/samsung-dsim.h
@@ -41,6 +41,7 @@ struct samsung_dsim_driver_data {
 	unsigned int wait_for_reset;
 	unsigned int num_bits_resol;
 	const unsigned int *reg_values;
+	bool platform_init;
 };
 
 struct samsung_dsim_host_ops {
-- 
2.25.1