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Message-ID: <aUF9wPzPaGD1nmM2@lizhi-Precision-Tower-5810>
Date: Tue, 16 Dec 2025 10:41:52 -0500
From: Frank Li <Frank.li@....com>
To: Alexander Stein <alexander.stein@...tq-group.com>
Cc: Philipp Zabel <p.zabel@...gutronix.de>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Shawn Guo <shawnguo@...nel.org>,
Sascha Hauer <s.hauer@...gutronix.de>,
Pengutronix Kernel Team <kernel@...gutronix.de>,
Fabio Estevam <festevam@...il.com>,
Rui Miguel Silva <rmfrfs@...il.com>,
Laurent Pinchart <laurent.pinchart@...asonboard.com>,
Martin Kepplinger-Novakovic <martink@...teo.de>,
Purism Kernel Team <kernel@...i.sm>,
linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org,
imx@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/5] media: nxp: use dev_err_probe() to simplify code
On Tue, Dec 16, 2025 at 03:50:17PM +0100, Alexander Stein wrote:
> Hi Frank,
>
> Am Dienstag, 16. Dezember 2025, 15:46:00 CET schrieb Frank Li:
> > On Tue, Dec 16, 2025 at 08:34:18AM +0100, Alexander Stein wrote:
> > > Hi,
> > >
> > > Am Montag, 15. Dezember 2025, 23:49:53 CET schrieb Frank Li:
> > > > Use dev_err_probe() to simplify the code. Drop the explicit error message
> > > > after returning from imx8mq_mipi_csi_parse_dt(), as the error is already
> > > > reported by this helper.
> > > >
> > > > No functional change.
> > > >
> > > > Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> > > > Signed-off-by: Frank Li <Frank.Li@....com>
> > > > ---
> > > > change in v2:
> > > > - add Laurent Pinchart review tags
> > > > - wrap error message to new line
> > > > - remove error code print in dev_err_probe();
> > > > - drop error messaage at imx8mq_mipi_csi_parse_dt()
> > > > ---
> > > > drivers/media/platform/nxp/imx-mipi-csis.c | 6 ++---
> > > > drivers/media/platform/nxp/imx7-media-csi.c | 14 ++++--------
> > > > drivers/media/platform/nxp/imx8mq-mipi-csi2.c | 33 ++++++++++++---------------
> > > > 3 files changed, 21 insertions(+), 32 deletions(-)
> > > >
> > > > diff --git a/drivers/media/platform/nxp/imx-mipi-csis.c b/drivers/media/platform/nxp/imx-mipi-csis.c
> > > > index 088b2945aee33731c565f049dd17721356300b84..ce93d868746f002c22e2f86b1e0aa84ec1a76061 100644
> > > > --- a/drivers/media/platform/nxp/imx-mipi-csis.c
> > > > +++ b/drivers/media/platform/nxp/imx-mipi-csis.c
> > > > @@ -1547,10 +1547,8 @@ static int mipi_csis_probe(struct platform_device *pdev)
> > > > /* Now that the hardware is initialized, request the interrupt. */
> > > > ret = devm_request_irq(dev, irq, mipi_csis_irq_handler, 0,
> > > > dev_name(dev), csis);
> > > > - if (ret) {
> > > > - dev_err(dev, "Interrupt request failed\n");
> > > > - return ret;
> > > > - }
> > > > + if (ret)
> > > > + return dev_err_probe(dev, ret, "Interrupt request failed\n");
> > > >
> > > > /* Initialize and register the subdev. */
> > > > ret = mipi_csis_subdev_init(csis);
> > > > diff --git a/drivers/media/platform/nxp/imx7-media-csi.c b/drivers/media/platform/nxp/imx7-media-csi.c
> > > > index 933a5f39f9f4c9b43ca8d2a1819d0145981266e6..7ddc7ba06e3d4e007013821f67d783898a15461f 100644
> > > > --- a/drivers/media/platform/nxp/imx7-media-csi.c
> > > > +++ b/drivers/media/platform/nxp/imx7-media-csi.c
> > > > @@ -2218,11 +2218,9 @@ static int imx7_csi_probe(struct platform_device *pdev)
> > > >
> > > > /* Acquire resources and install interrupt handler. */
> > > > csi->mclk = devm_clk_get(&pdev->dev, "mclk");
> > > > - if (IS_ERR(csi->mclk)) {
> > > > - ret = PTR_ERR(csi->mclk);
> > > > - dev_err(dev, "Failed to get mclk: %d", ret);
> > > > - return ret;
> > > > - }
> > > > + if (IS_ERR(csi->mclk))
> > > > + return dev_err_probe(dev, PTR_ERR(csi->mclk),
> > > > + "Failed to get mclk\n");
> > > >
> > > > csi->irq = platform_get_irq(pdev, 0);
> > > > if (csi->irq < 0)
> > > > @@ -2236,10 +2234,8 @@ static int imx7_csi_probe(struct platform_device *pdev)
> > > >
> > > > ret = devm_request_irq(dev, csi->irq, imx7_csi_irq_handler, 0, "csi",
> > > > (void *)csi);
> > > > - if (ret < 0) {
> > > > - dev_err(dev, "Request CSI IRQ failed.\n");
> > > > - return ret;
> > > > - }
> > > > + if (ret < 0)
> > > > + return dev_err_probe(dev, ret, "Request CSI IRQ failed.\n");
> > > >
> > > > /* Initialize all the media device infrastructure. */
> > > > ret = imx7_csi_media_init(csi);
> > > > diff --git a/drivers/media/platform/nxp/imx8mq-mipi-csi2.c b/drivers/media/platform/nxp/imx8mq-mipi-csi2.c
> > > > index 0851f4a9ae52d3096f454da643cfdc5017e000b1..a007c582b4d91660a97910a6a0d53c9b6fcd73e9 100644
> > > > --- a/drivers/media/platform/nxp/imx8mq-mipi-csi2.c
> > > > +++ b/drivers/media/platform/nxp/imx8mq-mipi-csi2.c
> > > > @@ -951,10 +951,9 @@ static int imx8mq_mipi_csi_parse_dt(struct csi_state *state)
> > > > int ret = 0;
> > > >
> > > > state->rst = devm_reset_control_array_get_exclusive(dev);
> > > > - if (IS_ERR(state->rst)) {
> > > > - dev_err(dev, "Failed to get reset: %pe\n", state->rst);
> > > > - return PTR_ERR(state->rst);
> > > > - }
> > > > + if (IS_ERR(state->rst))
> > > > + return dev_err_probe(dev, PTR_ERR(state->rst),
> > > > + "Failed to get reset\n");
> > > >
> > > > if (state->pdata->use_reg_csr) {
> > > > const struct regmap_config regmap_config = {
> > > > @@ -977,24 +976,22 @@ static int imx8mq_mipi_csi_parse_dt(struct csi_state *state)
> > > >
> > > > ret = of_property_read_u32_array(np, "fsl,mipi-phy-gpr", out_val,
> > > > ARRAY_SIZE(out_val));
> > > > - if (ret) {
> > > > - dev_err(dev, "no fsl,mipi-phy-gpr property found: %d\n", ret);
> > > > - return ret;
> > > > - }
> > > > + if (ret)
> > > > + return dev_err_probe(dev, ret, "no %s property found\n",
> > > > + "fsl,mipi-phy-gpr");
> > >
> > > Do you really need to pass the (fixed) property name as an argument? Why
> > > not move into the const string directly? I would also rephrase it a bit:
> > > "property fsl,mipi-phy-gpr not found"
> >
> > Laurent Pinchart provide comments at previous version. The same
> > "fsl,mipi-phy-gpr" share one entry at RO region. slice save RO region
> > space.
> >
> > https://lore.kernel.org/imx/20251119043307.GH17526@pendragon.ideasonboard.com/
>
> "assuming it's worth it". Do you have any numbers? I doubt there is a
> significant benefit, but I don't have strong opinion here.
Yes, only few byte. But no worth to argue this. Laurent Pinchart, who pick
patches.
> But the grammar should still be improved.
Okay, will update it.
Frank
>
> Best regards
> Alexander
>
> > Frank
> >
> > >
> > > With that fixed:
> > > Reviewed-by: Alexander Stein <alexander.stein@...tq-group.com>
> > >
> > > >
> > > > ph = *out_val;
> > > >
> > > > node = of_find_node_by_phandle(ph);
> > > > - if (!node) {
> > > > - dev_err(dev, "Error finding node by phandle\n");
> > > > - return -ENODEV;
> > > > - }
> > > > + if (!node)
> > > > + return dev_err_probe(dev, -ENODEV,
> > > > + "Error finding node by phandle\n");
> > > > +
> > > > state->phy_gpr = syscon_node_to_regmap(node);
> > > > of_node_put(node);
> > > > - if (IS_ERR(state->phy_gpr)) {
> > > > - dev_err(dev, "failed to get gpr regmap: %pe\n", state->phy_gpr);
> > > > - return PTR_ERR(state->phy_gpr);
> > > > - }
> > > > + if (IS_ERR(state->phy_gpr))
> > > > + return dev_err_probe(dev, PTR_ERR(state->phy_gpr),
> > > > + "failed to get gpr regmap\n");
> > > >
> > > > state->phy_gpr_reg = out_val[1];
> > > > dev_dbg(dev, "phy gpr register set to 0x%x\n", state->phy_gpr_reg);
> > > > @@ -1017,10 +1014,8 @@ static int imx8mq_mipi_csi_probe(struct platform_device *pdev)
> > > > state->pdata = of_device_get_match_data(dev);
> > > >
> > > > ret = imx8mq_mipi_csi_parse_dt(state);
> > > > - if (ret < 0) {
> > > > - dev_err(dev, "Failed to parse device tree: %d\n", ret);
> > > > + if (ret < 0)
> > > > return ret;
> > > > - }
> > > >
> > > > /* Acquire resources. */
> > > > state->regs = devm_platform_ioremap_resource(pdev, 0);
> > > >
> > > >
> > >
> > >
> > > --
> > > TQ-Systems GmbH | Mühlstraße 2, Gut Delling | 82229 Seefeld, Germany
> > > Amtsgericht München, HRB 105018
> > > Geschäftsführer: Detlef Schneider, Rüdiger Stahl, Stefan Schneider
> > > http://www.tq-group.com/
> >
> >
> >
>
>
> --
> TQ-Systems GmbH | Mühlstraße 2, Gut Delling | 82229 Seefeld, Germany
> Amtsgericht München, HRB 105018
> Geschäftsführer: Detlef Schneider, Rüdiger Stahl, Stefan Schneider
> http://www.tq-group.com/
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