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

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Message-ID: <c8795995227b3a83e9285d8e87befe6393d97d21.camel@mediatek.com>
Date:   Tue, 11 Jul 2023 08:57:18 +0000
From:   Chunfeng Yun (云春峰) 
        <Chunfeng.Yun@...iatek.com>
To:     "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        "frank.li@...o.com" <frank.li@...o.com>,
        "vkoul@...nel.org" <vkoul@...nel.org>,
        "angelogioacchino.delregno@...labora.com" 
        <angelogioacchino.delregno@...labora.com>,
        "kishon@...nel.org" <kishon@...nel.org>
CC:     "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-phy@...ts.infradead.org" <linux-phy@...ts.infradead.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/4] phy: mediatek: tphy: Convert to
 devm_platform_ioremap_resource()

On Wed, 2023-07-05 at 12:00 +0200, AngeloGioacchino Del Regno wrote:
>  	 
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
>  Il 05/07/23 11:30, Yangtao Li ha scritto:
> > 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?
> > 
> 
> As I said, MTK_PHY_V1 *needs* sif; devm_platform_ioremap_resource()
> returns a
> handle to that iospace, or error.
> 
> tphy->sif_base = devm_platform_ioremap_resource(pdev, 0);
> if (IS_ERR(tphy->sif_base))
> return PTR_ERR(tphy->sif_base);

Yes, it's right, thanks

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