Re: [PATCH v9 7/7] i3c: hub: p3h2x4x: Add support for NXP P3H2x4x I3C hub functionality

[Frank Li <Frank.li@nxp.com>]

On Mon, Apr 20, 2026 at 04:22:22PM +0530, Lakshay Piplani wrote:
> From: Aman Kumar Pandey <aman.kumarpandey@nxp.com>
>
> Add I3C hub functionality for the NXP P3H2x4x family of multiport hubs.
> These devices support downstream target ports that can be configured
> as I3C, I2C, or SMBus.
>
> This driver enables:
> - I3C/I2C communication between host and hub
> - Transparent communication with downstream devices
> - Target port configuration (I3C/I2C/SMBus)
> - MCTP device support
> - In-band interrupt handling
>
> P3H2440/P3H2441 support 4 target ports.
> P3H2840/P3H2841 support 8 target ports.
>
> Signed-off-by: Aman Kumar Pandey <aman.kumarpandey@nxp.com>
> Signed-off-by: Vikash Bansal <vikash.bansal@nxp.com>
> Signed-off-by: Lakshay Piplani <lakshay.piplani@nxp.com>
>
...
> +static int p3h2x4x_configure_ldo(struct device *dev)
> +{
> +	static const char * const supplies[] = {
> +		"vcc1",
> +		"vcc2",
> +		"vcc3",
> +		"vcc4"
> +	};
> +	int ret, i;
> +
> +	for (i = 0; i < ARRAY_SIZE(supplies); i++) {
> +		ret = devm_regulator_get_enable_optional(dev->parent, supplies[i]);
> +		if (ret == -EPROBE_DEFER)
> +			return -EPROBE_DEFER;
> +
> +		if (ret && ret != -ENODEV)
> +			dev_warn(dev, "Failed to enable %s (%d)\n",
> +				 supplies[i], ret);
> +	}
> +
> +	/* This delay is required for the regulator to stabilize its output voltage */
> +	mdelay(5);

Now perfer use fsleep()

...
> +int p3h2x4x_tp_i3c_algo(struct p3h2x4x_i3c_hub_dev *p3h2x4x_hub)
> +{
> +	struct i3c_master_controller *parent = i3c_dev_get_master(p3h2x4x_hub->i3cdev->desc);
> +	u8 tp, ntwk_mask = 0;
> +	int ret;
> +
> +	p3h2x4x_hub->hub = i3c_hub_init(parent,
> +					&p3h2x4x_hub_ops,
> +					p3h2x4x_hub->i3cdev);
> +
> +	if (IS_ERR(p3h2x4x_hub->hub))
> +		return PTR_ERR(p3h2x4x_hub->hub);
> +
> +	for (tp = 0; tp < P3H2X4X_TP_MAX_COUNT; tp++) {
> +		if (!p3h2x4x_hub->tp_bus[tp].of_node ||
> +		    p3h2x4x_hub->hub_config.tp_config[tp].mode != P3H2X4X_TP_MODE_I3C)
> +			continue;
> +
> +		/* Assign DT node for this TP */
> +		p3h2x4x_hub->dev->of_node = p3h2x4x_hub->tp_bus[tp].of_node;

device_set_of_node_from_dev()


...
> + * I2C algorithm Structure
> + */
> +static struct i2c_algorithm p3h2x4x_tp_i2c_algorithm = {
> +	.master_xfer    = p3h2x4x_tp_i2c_xfer,
> +#if IS_ENABLED(CONFIG_I2C_SLAVE)

If slave mode is not essesical, suggest add later, this patch is already
big.

Frank