linux-kernel - Re: [PATCH 4/4] phy: mediatek: tphy: Convert to devm_platform_ioremap

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Date:   Wed, 5 Jul 2023 17:30:01 +0800
From:   Yangtao Li <frank.li@...o.com>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>
Cc:     linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-phy@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] phy: mediatek: tphy: Convert to
 devm_platform_ioremap_resource()

HI AngeloGioacchino,

On 2023/7/5 17:22, AngeloGioacchino Del Regno wrote:
> Il 05/07/23 11:01, Yangtao Li ha scritto:
>> Use devm_platform_ioremap_resource() to simplify code.
>>
>> Signed-off-by: Yangtao Li <frank.li@...o.com>
>> ---
>>   drivers/phy/mediatek/phy-mtk-tphy.c | 10 +++-------
>>   1 file changed, 3 insertions(+), 7 deletions(-)
>>
>> diff --git a/drivers/phy/mediatek/phy-mtk-tphy.c 
>> b/drivers/phy/mediatek/phy-mtk-tphy.c
>> index 0d110e50bbfd..cb7a4e6ea017 100644
>> --- a/drivers/phy/mediatek/phy-mtk-tphy.c
>> +++ b/drivers/phy/mediatek/phy-mtk-tphy.c
>> @@ -1554,7 +1554,6 @@ static int mtk_tphy_probe(struct 
>> platform_device *pdev)
>>       struct device_node *np = dev->of_node;
>>       struct device_node *child_np;
>>       struct phy_provider *provider;
>> -    struct resource *sif_res;
>>       struct mtk_tphy *tphy;
>>       struct resource res;
>>       int port, retval;
>> @@ -1576,15 +1575,12 @@ static int mtk_tphy_probe(struct 
>> platform_device *pdev)
>>       tphy->dev = dev;
>>       platform_set_drvdata(pdev, tphy);
>>   -    sif_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>>       /* SATA phy of V1 needn't it if not shared with PCIe or USB */
>> -    if (sif_res && tphy->pdata->version == MTK_PHY_V1) {
>> +    if (tphy->pdata->version == MTK_PHY_V1) {
>>           /* get banks shared by multiple phys */
>> -        tphy->sif_base = devm_ioremap_resource(dev, sif_res);
>> -        if (IS_ERR(tphy->sif_base)) {
>> -            dev_err(dev, "failed to remap sif regs\n");
>> +        tphy->sif_base = devm_platform_ioremap_resource(pdev, 0);
>> +        if (IS_ERR(tphy->sif_base) && PTR_ERR(tphy->sif_base) != 
>> -EINVAL)
>
> That's wrong. You want to return any error unconditionally, as the V1 
> PHY *needs*
> the sif iospace and there's nothing afterwards retrying this.


When sif_res is not configured, an IOMEM_ERR_PTR(-EINVAL) error will be 
returned in __devm_ioremap_resource.

This kind of error is ignored in the newly added code, and the driving 
probe process will not be interrupted at this time.

What did I miss?

Thx,

Yangtao


>
> Please fix.
>
> Regards,
> Angelo
>
>>               return PTR_ERR(tphy->sif_base);
>> -        }
>>       }
>>         if (tphy->pdata->version < MTK_PHY_V3) {
>
>