linux-kernel - Re: [PATCH v4 04/18] memory: mtk-smi: Use a struct for the platform data for smi-common

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Message-ID: <7a216644-bc10-c31d-209a-abbcf20a14b6@gmail.com>
Date:   Fri, 21 Dec 2018 18:49:09 +0100
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Yong Wu <yong.wu@...iatek.com>, Joerg Roedel <joro@...tes.org>,
        Robin Murphy <robin.murphy@....com>,
        Rob Herring <robh+dt@...nel.org>
Cc:     Tomasz Figa <tfiga@...gle.com>, Will Deacon <will.deacon@....com>,
        linux-mediatek@...ts.infradead.org, srv_heupstream@...iatek.com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org, arnd@...db.de,
        yingjoe.chen@...iatek.com, youlin.pei@...iatek.com,
        Nicolas Boichat <drinkcat@...omium.org>,
        Arvind Yadav <arvind.yadav.cs@...il.com>
Subject: Re: [PATCH v4 04/18] memory: mtk-smi: Use a struct for the platform
 data for smi-common



On 08/12/2018 09:39, Yong Wu wrote:
> Use a struct as the platform special data instead of the enumeration.
> 
> Also there is a minor change that moving the position of
> "enum mtk_smi_gen" definition, this is because we expect define
> "struct mtk_smi_common_plat" before it is referred.
> 
> This is a preparing patch for mt8183.
> 
> Signed-off-by: Yong Wu <yong.wu@...iatek.com>

Reviewed-by: Matthias Brugger <matthias.bgg@...il.com>

> ---
>  drivers/memory/mtk-smi.c | 35 ++++++++++++++++++++++++-----------
>  1 file changed, 24 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/memory/mtk-smi.c b/drivers/memory/mtk-smi.c
> index 3b9ad0e..a5ddd42 100644
> --- a/drivers/memory/mtk-smi.c
> +++ b/drivers/memory/mtk-smi.c
> @@ -49,6 +49,15 @@
>  #define SMI_LARB_NONSEC_CON(id)	(0x380 + ((id) * 4))
>  #define F_MMU_EN		BIT(0)
>  
> +enum mtk_smi_gen {
> +	MTK_SMI_GEN1,
> +	MTK_SMI_GEN2
> +};
> +
> +struct mtk_smi_common_plat {
> +	enum mtk_smi_gen gen;
> +};
> +
>  struct mtk_smi_larb_gen {
>  	bool need_larbid;
>  	int port_in_larb[MTK_LARB_NR_MAX + 1];
> @@ -61,6 +70,8 @@ struct mtk_smi {
>  	struct clk			*clk_apb, *clk_smi;
>  	struct clk			*clk_async; /*only needed by mt2701*/
>  	void __iomem			*smi_ao_base;
> +
> +	const struct mtk_smi_common_plat *plat;
>  };
>  
>  struct mtk_smi_larb { /* larb: local arbiter */
> @@ -72,11 +83,6 @@ struct mtk_smi_larb { /* larb: local arbiter */
>  	u32				*mmu;
>  };
>  
> -enum mtk_smi_gen {
> -	MTK_SMI_GEN1,
> -	MTK_SMI_GEN2
> -};
> -
>  static int mtk_smi_enable(const struct mtk_smi *smi)
>  {
>  	int ret;
> @@ -351,18 +357,26 @@ static int mtk_smi_larb_remove(struct platform_device *pdev)
>  	}
>  };
>  
> +static const struct mtk_smi_common_plat mtk_smi_common_gen1 = {
> +	.gen = MTK_SMI_GEN1,
> +};
> +
> +static const struct mtk_smi_common_plat mtk_smi_common_gen2 = {
> +	.gen = MTK_SMI_GEN2,
> +};
> +
>  static const struct of_device_id mtk_smi_common_of_ids[] = {
>  	{
>  		.compatible = "mediatek,mt8173-smi-common",
> -		.data = (void *)MTK_SMI_GEN2
> +		.data = &mtk_smi_common_gen2,
>  	},
>  	{
>  		.compatible = "mediatek,mt2701-smi-common",
> -		.data = (void *)MTK_SMI_GEN1
> +		.data = &mtk_smi_common_gen1,
>  	},
>  	{
>  		.compatible = "mediatek,mt2712-smi-common",
> -		.data = (void *)MTK_SMI_GEN2
> +		.data = &mtk_smi_common_gen2,
>  	},
>  	{}
>  };
> @@ -372,13 +386,13 @@ static int mtk_smi_common_probe(struct platform_device *pdev)
>  	struct device *dev = &pdev->dev;
>  	struct mtk_smi *common;
>  	struct resource *res;
> -	enum mtk_smi_gen smi_gen;
>  	int ret;
>  
>  	common = devm_kzalloc(dev, sizeof(*common), GFP_KERNEL);
>  	if (!common)
>  		return -ENOMEM;
>  	common->dev = dev;
> +	common->plat = of_device_get_match_data(dev);
>  
>  	common->clk_apb = devm_clk_get(dev, "apb");
>  	if (IS_ERR(common->clk_apb))
> @@ -394,8 +408,7 @@ static int mtk_smi_common_probe(struct platform_device *pdev)
>  	 * clock into emi clock domain, but for mtk smi gen2, there's no smi ao
>  	 * base.
>  	 */
> -	smi_gen = (enum mtk_smi_gen)of_device_get_match_data(dev);
> -	if (smi_gen == MTK_SMI_GEN1) {
> +	if (common->plat->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))
>