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SubjectRe: [PATCH] memory: mtk-smi: Use of_device_get_match_data helper
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On 26/07/17 10:59, honghui.zhang@mediatek.com wrote:
> From: Honghui Zhang <honghui.zhang@mediatek.com>
>
> Replace custom code with generic helper to retrieve driver data.
>
> Signed-off-by: Honghui Zhang <honghui.zhang@mediatek.com>
> ---
> drivers/memory/mtk-smi.c | 18 ++++--------------
> 1 file changed, 4 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/memory/mtk-smi.c b/drivers/memory/mtk-smi.c
> index 4afbc41..fe8b81a 100644
> --- a/drivers/memory/mtk-smi.c
> +++ b/drivers/memory/mtk-smi.c
> @@ -240,20 +240,15 @@ static int mtk_smi_larb_probe(struct platform_device *pdev)
> struct device *dev = &pdev->dev;
> struct device_node *smi_node;
> struct platform_device *smi_pdev;
> - const struct of_device_id *of_id;
>
> if (!dev->pm_domain)
> return -EPROBE_DEFER;
>
> - of_id = of_match_node(mtk_smi_larb_of_ids, pdev->dev.of_node);
> - if (!of_id)
> - return -EINVAL;
> -
> larb = devm_kzalloc(dev, sizeof(*larb), GFP_KERNEL);
> if (!larb)
> return -ENOMEM;
>
> - larb->larb_gen = of_id->data;
> + larb->larb_gen = of_device_get_match_data(dev);
> res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> larb->base = devm_ioremap_resource(dev, res);
> if (IS_ERR(larb->base))
> @@ -319,8 +314,7 @@ static int mtk_smi_common_probe(struct platform_device *pdev)
> struct device *dev = &pdev->dev;
> struct mtk_smi *common;
> struct resource *res;
> - const struct of_device_id *of_id;
> - enum mtk_smi_gen smi_gen;
> + const enum mtk_smi_gen *smi_gen;
>
> if (!dev->pm_domain)
> return -EPROBE_DEFER;
> @@ -338,18 +332,14 @@ static int mtk_smi_common_probe(struct platform_device *pdev)
> if (IS_ERR(common->clk_smi))
> return PTR_ERR(common->clk_smi);
>
> - of_id = of_match_node(mtk_smi_common_of_ids, pdev->dev.of_node);
> - if (!of_id)
> - return -EINVAL;
> -
> /*
> * for mtk smi gen 1, we need to get the ao(always on) base to config
> * m4u port, and we need to enable the aync clock for transform the smi
> * clock into emi clock domain, but for mtk smi gen2, there's no smi ao
> * base.
> */
> - smi_gen = (enum mtk_smi_gen)of_id->data;
> - if (smi_gen == MTK_SMI_GEN1) {
> + smi_gen = of_device_get_match_data(dev);

The data you're retrieving is the exact same thing as of_id->data was,
i.e. an enum mtk_smi_gen cast to void*, so dereferencing it is not a
good idea. The first patch was almost right; you just need to keep the
cast in the assignment to smi_gen.

Robin.

> + if (*smi_gen == MTK_SMI_GEN1) {
> res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> common->smi_ao_base = devm_ioremap_resource(dev, res);
> if (IS_ERR(common->smi_ao_base))
>

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