Re: [PATCH v2 2/2] drivers: remoteproc: Add C906L controller for Sophgo CV1800B SoC

[Krzysztof Kozlowski]

On 28/07/2025 13:03, Junhui Liu wrote:
> +
> +static int cv1800b_c906l_mem_alloc(struct rproc *rproc,
> +				   struct rproc_mem_entry *mem)
> +{
> +	void __iomem *va;
> +
> +	va = ioremap_wc(mem->dma, mem->len);
> +	if (!va)
> +		return -ENOMEM;
> +
> +	/* Update memory entry va */
> +	mem->va = (void *)va;
> +
> +	return 0;
> +}
> +
> +static int cv1800b_c906l_mem_release(struct rproc *rproc,
> +				     struct rproc_mem_entry *mem)
> +{
> +	iounmap((void __iomem *)mem->va);
> +	return 0;
> +}
> +
> +static int cv1800b_c906l_add_carveout(struct rproc *rproc)
> +{
> +	struct device *dev = rproc->dev.parent;
> +	struct device_node *np = dev->of_node;
> +	struct of_phandle_iterator it;
> +	struct rproc_mem_entry *mem;
> +	struct reserved_mem *rmem;
> +	int i = 0;
> +
> +	/* Register associated reserved memory regions */
> +	of_phandle_iterator_init(&it, np, "memory-region", NULL, 0);
> +	while (of_phandle_iterator_next(&it) == 0) {
> +		rmem = of_reserved_mem_lookup(it.node);
> +		if (!rmem) {
> +			of_node_put(it.node);
> +			return -EINVAL;
> +		}
> +
> +		if (!strcmp(it.node->name, "vdev0buffer")) {

Why are you adding undocumented ABI? And so hidden, not even using
standard OF API!

How does this behaves when I change your DTS to call it
"whateverbuffer"? Does it work? Obviously not.

No, stop doing that.

Best regards,
Krzysztof