Re: [RFC PATCH v2 30/31] kvx: Add power controller driver

[Krzysztof Kozlowski]

On 20/01/2023 15:10, Yann Sionneau wrote:
> From: Jules Maselbas <jmaselbas@xxxxxxxxx>
> 
> The Power Controller (pwr-ctrl) control cores reset and wake-up
> procedure.


> +
> +static struct device_node * __init get_pwr_ctrl_node(void)
> +{
> +	const phandle *ph;
> +	struct device_node *cpu;
> +	struct device_node *node;
> +
> +	cpu = of_get_cpu_node(raw_smp_processor_id(), NULL);
> +	if (!cpu) {
> +		pr_err("Failed to get CPU node\n");
> +		return NULL;
> +	}
> +
> +	ph = of_get_property(cpu, "power-controller", NULL);
> +	if (!ph) {
> +		pr_err("Failed to get power-controller phandle\n");
> +		return NULL;
> +	}
> +
> +	node = of_find_node_by_phandle(be32_to_cpup(ph));
> +	if (!node) {
> +		pr_err("Failed to get power-controller node\n");
> +		return NULL;
> +	}
> +
> +	return node;
> +}
> +
> +int __init kvx_pwr_ctrl_probe(void)
> +{
> +	struct device_node *ctrl;
> +
> +	ctrl = get_pwr_ctrl_node();
> +	if (!ctrl) {
> +		pr_err("Failed to get power controller node\n");
> +		return -EINVAL;
> +	}
> +
> +	if (!of_device_is_compatible(ctrl, "kalray,kvx-pwr-ctrl")) {
> +		pr_err("Failed to get power controller node\n");

No. Drivers go to drivers, not to arch directory. This should be a
proper driver instead of some fake stub doing its own driver matching.
You need to rework this.

Best regards,
Krzysztof