linux-kernel - Re: [PATCH v2 1/3] memory: mtk-smi: add larbid handle routine

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Message-ID: <18e1c24a-529d-85ef-0027-90c491927d6b@gmail.com>
Date:   Mon, 31 Jul 2017 11:32:01 +0200
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     honghui.zhang@...iatek.com, joro@...tes.org, robh@...nel.org,
        robin.murphy@....com
Cc:     devicetree@...r.kernel.org, kendrick.hsu@...iatek.com,
        srv_heupstream@...iatek.com, will.deacon@....com,
        linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
        robh+dt@...nel.org, linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, youlin.pei@...iatek.com,
        erin.lo@...iatek.com, yong.wu@...iatek.com,
        xinping.qian@...iatek.com
Subject: Re: [PATCH v2 1/3] memory: mtk-smi: add larbid handle routine



On 07/28/2017 12:55 PM, honghui.zhang@...iatek.com wrote:
> From: Honghui Zhang <honghui.zhang@...iatek.com>
> 
> In the commit 3c8f4ad85c4b ("memory/mediatek: add support for mt2701"),
> the larb->larbid was added but not initialized.
> Mediatek's gen1 smi need this hardware larbid information to get the
> register offset which controls whether enable iommu for this larb.
> This patch add the initialize routine for larbid.
> 
> Signed-off-by: Honghui Zhang <honghui.zhang@...iatek.com>

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

> ---
>   drivers/memory/mtk-smi.c | 12 ++++++++++++
>   1 file changed, 12 insertions(+)
> 
> diff --git a/drivers/memory/mtk-smi.c b/drivers/memory/mtk-smi.c
> index 2b798bb4..8f75aaa 100644
> --- a/drivers/memory/mtk-smi.c
> +++ b/drivers/memory/mtk-smi.c
> @@ -42,6 +42,7 @@
>   #define SMI_SECUR_CON_VAL_DOMAIN(id)	(0x3 << ((((id) & 0x7) << 2) + 1))
>   
>   struct mtk_smi_larb_gen {
> +	bool need_larbid;
>   	int port_in_larb[MTK_LARB_NR_MAX + 1];
>   	void (*config_port)(struct device *);
>   };
> @@ -214,6 +215,7 @@ static const struct mtk_smi_larb_gen mtk_smi_larb_mt8173 = {
>   };
>   
>   static const struct mtk_smi_larb_gen mtk_smi_larb_mt2701 = {
> +	.need_larbid = true,
>   	.port_in_larb = {
>   		LARB0_PORT_OFFSET, LARB1_PORT_OFFSET,
>   		LARB2_PORT_OFFSET, LARB3_PORT_OFFSET
> @@ -240,6 +242,7 @@ 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;
> +	int err;
>   
>   	if (!dev->pm_domain)
>   		return -EPROBE_DEFER;
> @@ -263,6 +266,15 @@ static int mtk_smi_larb_probe(struct platform_device *pdev)
>   		return PTR_ERR(larb->smi.clk_smi);
>   	larb->smi.dev = dev;
>   
> +	if (larb->larb_gen->need_larbid) {
> +		err = of_property_read_u32(dev->of_node, "mediatek,larbid",
> +					   &larb->larbid);
> +		if (err) {
> +			dev_err(dev, "missing larbid property\n");
> +			return err;
> +		}
> +	}
> +
>   	smi_node = of_parse_phandle(dev->of_node, "mediatek,smi", 0);
>   	if (!smi_node)
>   		return -EINVAL;
>