Re: [resend PATCH v6 12/12] drm/mediatek: Add support for mmsys through a pdev

Enric Balletbo i Serra
2019-12-09T10:15:44Z

Hi Matthias,

Just one nit below and LGTM

On 7/12/19 23:47, matthias.bgg@kernel.org wrote:
> From: Matthias Brugger <mbrugger@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 <mbrugger@suse.com>

Reviewed-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>

> ---
> drivers/gpu/drm/mediatek/mtk_drm_drv.c | 24 ++++++++++++++++++++++++
> drivers/gpu/drm/mediatek/mtk_drm_drv.h | 2 ++
> 2 files changed, 26 insertions(+)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> index 210455e9f46c..5ada74d8d0c9 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> @@ -186,6 +186,7 @@ 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 mt2712_mmsys_driver_data = {
> @@ -195,6 +196,7 @@ static const struct mtk_mmsys_driver_data mt2712_mmsys_driver_data = {
> .ext_len = ARRAY_SIZE(mt2712_mtk_ddp_ext),
> .third_path = mt2712_mtk_ddp_third,
> .third_len = ARRAY_SIZE(mt2712_mtk_ddp_third),
> + .clk_drv_name = "clk-mt2712-mm",
> };
>
> static const struct mtk_mmsys_driver_data mt8173_mmsys_driver_data = {
> @@ -202,6 +204,7 @@ 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)
> @@ -499,6 +502,24 @@ static int mtk_drm_probe(struct platform_device *pdev)
> INIT_WORK(&private->commit.work, mtk_atomic_work);
> private->data = of_device_get_match_data(dev);
>
> + /*
> + * MMSYS includes apart from components management a block providing
> + * clocks for the subsystem. We probe this clock driver via a platform
> + * device.
> + */
> + if (private->data->clk_drv_name) {
> + private->clk_dev = platform_device_register_data(dev,
> + private->data->clk_drv_name, -1,
> + NULL, 0);

Replace -1 for PLATFORM_DEVID_NONE

> +
> + if (IS_ERR(private->clk_dev)) {
> + dev_err(dev, "failed to register %s platform device\n",
> + private->data->clk_drv_name);
> +
> + return PTR_ERR(private->clk_dev);
> + }
> + }
> +
> private->config_regs = syscon_node_to_regmap(dev->of_node);
> if (IS_ERR(private->config_regs))
> return PTR_ERR(private->config_regs);
> @@ -605,6 +626,9 @@ 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 63a121577dcb..8fe9136adc38 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.h
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
> @@ -29,11 +29,13 @@ struct mtk_mmsys_driver_data {
> unsigned int third_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;
>
>