linux-kernel - Re: [PATCH v2 03/15] media: stm32: csi: addition of the STM32 CSI driver

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Message-ID: <8841158ed61b2b92a92ac6d2afcbd7cff12a6680.camel@pengutronix.de>
Date: Tue, 05 Nov 2024 11:14:47 +0100
From: Philipp Zabel <p.zabel@...gutronix.de>
To: Alain Volmat <alain.volmat@...s.st.com>, Hugues Fruchet
 <hugues.fruchet@...s.st.com>, Mauro Carvalho Chehab <mchehab@...nel.org>, 
 Maxime Coquelin <mcoquelin.stm32@...il.com>, Alexandre Torgue
 <alexandre.torgue@...s.st.com>, Hans Verkuil <hverkuil-cisco@...all.nl>,
 Sakari Ailus <sakari.ailus@...ux.intel.com>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>
Cc: linux-media@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	devicetree@...r.kernel.org
Subject: Re: [PATCH v2 03/15] media: stm32: csi: addition of the STM32 CSI
 driver

On Di, 2024-11-05 at 08:49 +0100, Alain Volmat wrote:
> The STM32 CSI controller is tightly coupled with the DCMIPP and act as an
> input stage to receive data coming from the sensor and transferring
> them into the DCMIPP.
> 
> Signed-off-by: Alain Volmat <alain.volmat@...s.st.com>
> 
> ---
> v2: correct data-lanes handling, using values 1 & 2
>     update yaml filename in MAINTAINERS
> ---
>  MAINTAINERS                                 |    8 +
>  drivers/media/platform/st/stm32/Kconfig     |   14 +
>  drivers/media/platform/st/stm32/Makefile    |    1 +
>  drivers/media/platform/st/stm32/stm32-csi.c | 1144 +++++++++++++++++++++++++++
>  4 files changed, 1167 insertions(+)
> 
[...]
> diff --git a/drivers/media/platform/st/stm32/stm32-csi.c b/drivers/media/platform/st/stm32/stm32-csi.c
> new file mode 100644
> index 0000000000000000000000000000000000000000..c7f47472c6b3699e94113ce0f38b280a2e45ce15
> --- /dev/null
> +++ b/drivers/media/platform/st/stm32/stm32-csi.c
> @@ -0,0 +1,1144 @@
[...]
> +static int stm32_csi_get_resources(struct stm32_csi_dev *csidev,
> +				   struct platform_device *pdev)
> +{
> +	int irq, ret;
> +
> +	csidev->base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
> +	if (IS_ERR(csidev->base))
> +		return dev_err_probe(&pdev->dev, PTR_ERR(csidev->base),
> +				     "Failed to ioremap resource\n");
> +
> +	csidev->pclk = devm_clk_get(&pdev->dev, "pclk");
> +	if (IS_ERR(csidev->pclk))
> +		return dev_err_probe(&pdev->dev, PTR_ERR(csidev->pclk),
> +				     "Couldn't get pclk\n");
> +
> +	csidev->txesc = devm_clk_get(&pdev->dev, "txesc");
> +	if (IS_ERR(csidev->txesc))
> +		return dev_err_probe(&pdev->dev, PTR_ERR(csidev->txesc),
> +				     "Couldn't get txesc\n");
> +
> +	csidev->csi2phy = devm_clk_get(&pdev->dev, "csi2phy");
> +	if (IS_ERR(csidev->csi2phy))
> +		return dev_err_probe(&pdev->dev, PTR_ERR(csidev->csi2phy),
> +				     "Couldn't get csi2phy\n");

Consider using devm_clk_bulk_get().

> +	csidev->rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);
> +	if (IS_ERR(csidev->rstc))
> +		return dev_err_probe(&pdev->dev, PTR_ERR(csidev->rstc),
> +				     "Couldn't get reset control\n");

If this wasn't in a separate function, rstc wouldn't have to be stored
on csidev as it's only ever used in stm32_csi_probe().

> +
> +	csidev->supplies[0].supply = "vdd";
> +	csidev->supplies[1].supply = "vdda18";
> +	ret = devm_regulator_bulk_get(&pdev->dev, ARRAY_SIZE(csidev->supplies),
> +				      csidev->supplies);
> +	if (ret)
> +		return dev_err_probe(&pdev->dev, ret,
> +				     "Failed to request regulator vdd\n");
> +
> +	irq = platform_get_irq(pdev, 0);
> +	if (irq < 0)
> +		return irq;
> +
> +	ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
> +					stm32_csi_irq_thread, IRQF_ONESHOT,
> +					dev_name(&pdev->dev), csidev);
> +	if (ret)
> +		return dev_err_probe(&pdev->dev, ret,
> +				     "Unable to request irq");
> +
> +	return 0;
> +}

regards
Philipp