linux-kernel - Re: [PATCH v3 2/5] media: iris: register and configure non-pixel node as platform device

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Message-ID: <0bcabd65-e9d1-40dc-ad84-87ed53b44755@linaro.org>
Date: Fri, 27 Jun 2025 18:01:19 +0100
From: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To: Vikash Garodia <quic_vgarodia@...cinc.com>,
 Dikshita Agarwal <quic_dikshita@...cinc.com>,
 Abhinav Kumar <abhinav.kumar@...ux.dev>,
 Mauro Carvalho Chehab <mchehab@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>
Cc: linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/5] media: iris: register and configure non-pixel node
 as platform device

On 27/06/2025 16:48, Vikash Garodia wrote:
> Register "non_pixel" child node as a platform device, and configure its
> DMA via of_dma_configure(). This ensures proper IOMMU attachment and DMA
> setup for the "non_pixel" device.
> All non pixel memory, i.e bitstream buffers, HFI queues and internal
> buffers related to bitstream processing, would be managed by non_pixel
> device.
> 
> Signed-off-by: Vikash Garodia <quic_vgarodia@...cinc.com>
> ---
>   drivers/media/platform/qcom/iris/iris_core.h  |  2 ++
>   drivers/media/platform/qcom/iris/iris_probe.c | 50 ++++++++++++++++++++++++++-
>   2 files changed, 51 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/platform/qcom/iris/iris_core.h b/drivers/media/platform/qcom/iris/iris_core.h
> index aeeac32a1f6d9a9fa7027e8e3db4d95f021c552e..757efd16870876bd2b1d5b1e4103b2d2326b5f49 100644
> --- a/drivers/media/platform/qcom/iris/iris_core.h
> +++ b/drivers/media/platform/qcom/iris/iris_core.h
> @@ -65,6 +65,7 @@ struct icc_info {
>    * @sys_error_handler: a delayed work for handling system fatal error
>    * @instances: a list_head of all instances
>    * @inst_fw_caps: an array of supported instance capabilities
> + * @np_dev: device to represent non pixel node
>    */
>   
>   struct iris_core {
> @@ -105,6 +106,7 @@ struct iris_core {
>   	struct delayed_work			sys_error_handler;
>   	struct list_head			instances;
>   	struct platform_inst_fw_cap		inst_fw_caps[INST_FW_CAP_MAX];
> +	struct device				*np_dev;
>   };
>   
>   int iris_core_init(struct iris_core *core);
> diff --git a/drivers/media/platform/qcom/iris/iris_probe.c b/drivers/media/platform/qcom/iris/iris_probe.c
> index 9a7ce142f7007ffcda0bd422c1983f2374bb0d92..8fe87e30bd40f3c67ec41305c7d73520fbc9db7b 100644
> --- a/drivers/media/platform/qcom/iris/iris_probe.c
> +++ b/drivers/media/platform/qcom/iris/iris_probe.c
> @@ -6,6 +6,8 @@
>   #include <linux/clk.h>
>   #include <linux/interconnect.h>
>   #include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
>   #include <linux/pm_domain.h>
>   #include <linux/pm_opp.h>
>   #include <linux/pm_runtime.h>
> @@ -127,6 +129,46 @@ static int iris_init_resets(struct iris_core *core)
>   				     core->iris_platform_data->controller_rst_tbl_size);
>   }
>   
> +static int iris_init_non_pixel_node(struct iris_core *core)
> +{
> +	struct platform_device_info info;
> +	struct platform_device *pdev;
> +	struct device_node *np_node;
> +	int ret;
> +
> +	np_node = of_get_child_by_name(core->dev->of_node, "non_pixel");
> +	if (!np_node)
> +		return 0;
> +
> +	memset(&info, 0, sizeof(info));
> +	info.fwnode = &np_node->fwnode;
> +	info.parent = core->dev;
> +	info.name = np_node->name;
> +	info.dma_mask = DMA_BIT_MASK(32);
> +
> +	pdev = platform_device_register_full(&info);
> +	if (IS_ERR(pdev)) {
> +		of_node_put(np_node);
> +		return PTR_ERR(pdev);
> +	}
> +	pdev->dev.of_node = np_node;
> +
> +	ret = of_dma_configure(&pdev->dev, np_node, true);
> +	if (ret)
> +		goto err_unregister;
> +
> +	core->np_dev = &pdev->dev;
> +
> +	of_node_put(np_node);
> +
> +	return 0;
> +
> +err_unregister:
> +	platform_device_unregister(pdev);
> +	of_node_put(np_node);
> +	return ret;
> +}
> +
>   static int iris_init_resources(struct iris_core *core)
>   {
>   	int ret;
> @@ -143,7 +185,11 @@ static int iris_init_resources(struct iris_core *core)
>   	if (ret)
>   		return ret;
>   
> -	return iris_init_resets(core);
> +	ret = iris_init_resets(core);
> +	if (ret)
> +		return ret;
> +
> +	return iris_init_non_pixel_node(core);
>   }
>   
>   static int iris_register_video_device(struct iris_core *core)
> @@ -188,6 +234,8 @@ static void iris_remove(struct platform_device *pdev)
>   
>   	iris_core_deinit(core);
>   
> +	platform_device_unregister(to_platform_device(core->np_dev));
> +
>   	video_unregister_device(core->vdev_dec);
>   
>   	v4l2_device_unregister(&core->v4l2_dev);
> 
Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>