[resend PATCH v4 4/5] drm/mediatek: Add support for mmsys through a pdev

[matthias . bgg]

From: Matthias Brugger <mbrug...@suse.com>

The MMSYS subsystem includes clocks and drm components.
This patch adds an initailization path through a platform device
for the clock part, so that both drivers get probed from the same
device tree compatible.

Signed-off-by: Matthias Brugger <mbrug...@suse.com>
---
 drivers/gpu/drm/mediatek/mtk_drm_drv.c | 18 ++++++++++++++++++
 drivers/gpu/drm/mediatek/mtk_drm_drv.h |  2 ++
 2 files changed, 20 insertions(+)

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c 
b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
index dd249cf5121e..c946aea722e5 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
@@ -173,6 +173,7 @@ static const struct mtk_mmsys_driver_data 
mt2701_mmsys_driver_data = {
        .ext_path = mt2701_mtk_ddp_ext,
        .ext_len = ARRAY_SIZE(mt2701_mtk_ddp_ext),
        .shadow_register = true,
+       .clk_drv_name = "clk-mt2701-mm",
 };
 
 static const struct mtk_mmsys_driver_data mt8173_mmsys_driver_data = {
@@ -180,6 +181,7 @@ static const struct mtk_mmsys_driver_data 
mt8173_mmsys_driver_data = {
        .main_len = ARRAY_SIZE(mt8173_mtk_ddp_main),
        .ext_path = mt8173_mtk_ddp_ext,
        .ext_len = ARRAY_SIZE(mt8173_mtk_ddp_ext),
+       .clk_drv_name = "clk-mt8173-mm",
 };
 
 static int mtk_drm_kms_init(struct drm_device *drm)
@@ -411,6 +413,19 @@ static int mtk_drm_probe(struct platform_device *pdev)
        if (IS_ERR(private->config_regs))
                return PTR_ERR(private->config_regs);
 
+       if (private->data->clk_drv_name) {
+               private->clk_dev = platform_device_register_data(dev,
+                                               private->data->clk_drv_name, -1,
+                                               NULL, 0);
+
+               if (IS_ERR(private->clk_dev)) {
+                       pr_err("failed to register %s platform device\n",
+                                               private->data->clk_drv_name);
+
+                       return PTR_ERR(private->clk_dev);
+               }
+       }
+
        /* Iterate over sibling DISP function blocks */
        for_each_child_of_node(dev->of_node->parent, node) {
                const struct of_device_id *of_id;
@@ -515,6 +530,9 @@ static int mtk_drm_remove(struct platform_device *pdev)
        for (i = 0; i < DDP_COMPONENT_ID_MAX; i++)
                of_node_put(private->comp_node[i]);
 
+       if (private->clk_dev)
+               platform_device_unregister(private->clk_dev);
+
        return 0;
 }
 
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.h 
b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
index 86cec19193c4..200eee5de419 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_drv.h
+++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
@@ -34,11 +34,13 @@ struct mtk_mmsys_driver_data {
        const enum mtk_ddp_comp_id *ext_path;
        unsigned int ext_len;
        bool shadow_register;
+       const char *clk_drv_name;
 };
 
 struct mtk_drm_private {
        struct drm_device *drm;
        struct device *dma_dev;
+       struct platform_device *clk_dev;
 
        unsigned int num_pipes;
 
-- 
2.17.1

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