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

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Message-ID: <ZKzjpebqy+J2b1hH@matsya>
Date:   Tue, 11 Jul 2023 10:37:49 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     Yangtao Li <frank.li@...o.com>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        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()

On 05-07-23, 12:00, AngeloGioacchino Del Regno wrote:
> 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);

That does sound right to me

-- 
~Vinod