Re: [PATCH 04/11] media: iris: Add helper to create a context bank device on iris vpu bus

[Dmitry Baryshkov]

On Tue, Apr 14, 2026 at 10:30:00AM +0530, Vishnu Reddy wrote:
> From: Vikash Garodia <vikash.garodia@xxxxxxxxxxxxxxxx>
> 
> Add a helper function to allocate and register context bank (CB) device
> on the iris vpu bus. The function ID associated with the CB is specified
> from the platform data, allowing the bus dma_configure callback to apply
> correct stream ID mapping when device is registered.
> 
> Signed-off-by: Vikash Garodia <vikash.garodia@xxxxxxxxxxxxxxxx>
> Signed-off-by: Vishnu Reddy <busanna.reddy@xxxxxxxxxxxxxxxx>
> ---
>  drivers/media/platform/qcom/iris/iris_resources.c | 33 +++++++++++++++++++++++
>  drivers/media/platform/qcom/iris/iris_resources.h |  1 +
>  2 files changed, 34 insertions(+)
> 
> diff --git a/drivers/media/platform/qcom/iris/iris_resources.c b/drivers/media/platform/qcom/iris/iris_resources.c
> index 773f6548370a..a25e0f2e9d26 100644
> --- a/drivers/media/platform/qcom/iris/iris_resources.c
> +++ b/drivers/media/platform/qcom/iris/iris_resources.c
> @@ -6,6 +6,7 @@
>  #include <linux/clk.h>
>  #include <linux/devfreq.h>
>  #include <linux/interconnect.h>
> +#include <linux/iris_vpu_bus.h>
>  #include <linux/pm_domain.h>
>  #include <linux/pm_opp.h>
>  #include <linux/pm_runtime.h>
> @@ -141,3 +142,35 @@ int iris_disable_unprepare_clock(struct iris_core *core, enum platform_clk_type
>  
>  	return 0;
>  }
> +
> +static void iris_release_cb_dev(struct device *dev)
> +{
> +	kfree(dev);
> +}
> +
> +struct device *iris_create_cb_dev(struct iris_core *core, const char *name, const u32 *f_id)

Please move into the bus code and make it generic enough.

> +{
> +	struct device *dev;
> +	int ret;
> +
> +	dev = kzalloc_obj(*dev);
> +	if (!dev)
> +		return ERR_PTR(-ENOMEM);
> +
> +	dev->release = iris_release_cb_dev;
> +	dev->bus = &iris_vpu_bus_type;
> +	dev->parent = core->dev;
> +	dev->coherent_dma_mask = core->iris_platform_data->dma_mask;
> +	dev->dma_mask = &dev->coherent_dma_mask;

Would you also need to set the of_node? See
device_set_of_node_from_dev()

> +
> +	dev_set_name(dev, "%s", name);
> +	dev_set_drvdata(dev, (void *)f_id);
> +
> +	ret = device_register(dev);
> +	if (ret) {
> +		put_device(dev);
> +		return ERR_PTR(ret);
> +	}
> +
> +	return dev;
> +}
> diff --git a/drivers/media/platform/qcom/iris/iris_resources.h b/drivers/media/platform/qcom/iris/iris_resources.h
> index 6bfbd2dc6db0..4a494627ff23 100644
> --- a/drivers/media/platform/qcom/iris/iris_resources.h
> +++ b/drivers/media/platform/qcom/iris/iris_resources.h
> @@ -15,5 +15,6 @@ int iris_unset_icc_bw(struct iris_core *core);
>  int iris_set_icc_bw(struct iris_core *core, unsigned long icc_bw);
>  int iris_disable_unprepare_clock(struct iris_core *core, enum platform_clk_type clk_type);
>  int iris_prepare_enable_clock(struct iris_core *core, enum platform_clk_type clk_type);
> +struct device *iris_create_cb_dev(struct iris_core *core, const char *name, const u32 *f_id);
>  
>  #endif
> 
> -- 
> 2.34.1
> 

-- 
With best wishes
Dmitry