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SubjectRe: [PATCH 3/8] drm/mediatek: mt2701: switch to mfd probing.
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On Tue, 2017-11-14 at 22:41 +0100, Matthias Brugger wrote:
> With the mtk-mmsys MFD device in place, we switch the probing for
> mt2701 from device-tree to mfd.
>
> Signed-off-by: Matthias Brugger <mbrugger@suse.com>
> ---
> drivers/gpu/drm/mediatek/mtk_drm_drv.c | 32 +++++++++++++++++++++++++-------
> 1 file changed, 25 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> index dd249cf5121e..5a263aa3ab6e 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> @@ -21,6 +21,7 @@
> #include <drm/drm_of.h>
> #include <linux/component.h>
> #include <linux/iommu.h>
> +#include <linux/mfd/mmsys.h>
> #include <linux/mfd/syscon.h>
> #include <linux/of_address.h>
> #include <linux/of_platform.h>
> @@ -392,9 +393,10 @@ static const struct of_device_id mtk_ddp_comp_dt_ids[] = {
>
> static int mtk_drm_probe(struct platform_device *pdev)
> {
> + struct mmsys_dev *mmsys_private;
> struct device *dev = &pdev->dev;
> struct mtk_drm_private *private;
> - struct device_node *node;
> + struct device_node *node, *parent_node;
> struct component_match *match = NULL;
> int ret;
> int i;
> @@ -407,12 +409,23 @@ 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);
>
> - private->config_regs = syscon_node_to_regmap(dev->of_node);
> - if (IS_ERR(private->config_regs))
> - return PTR_ERR(private->config_regs);
> + /* Check if called from mfd */
> + if (!dev->of_node) {
> + mmsys_private = dev_get_drvdata(pdev->dev.parent);
> + private->data = (struct mtk_mmsys_driver_data *)
> + platform_get_device_id(pdev)->driver_data;
> + private->config_regs =
> + syscon_node_to_regmap(mmsys_private->of_node);
> + parent_node = mmsys_private->of_node->parent;

I think this could be just:

mmsys_node = pdev->dev.parent->of_node;
private->data = (struct mtk_mmsys_driver_data *)> +
platform_get_device_id(pdev)->driver_data;
private->config_regs = syscon_node_to_regmap(mmsys_node);
parent_node = mmsys_node->parent;

regards
Philipp

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