linux-kernel - Re: [PATCH RFC 12/22] usb: typec: tipd: Add cd321x struct with separate size

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Message-ID: <aLrGRGTjyMhKV9hd@kuha.fi.intel.com>
Date: Fri, 5 Sep 2025 14:15:16 +0300
From: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To: Sven Peter <sven@...nel.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Felipe Balbi <balbi@...nel.org>,
	Janne Grunau <j@...nau.net>,
	Alyssa Rosenzweig <alyssa@...enzweig.io>,
	Neal Gompa <neal@...pa.dev>, Vinod Koul <vkoul@...nel.org>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
	Philipp Zabel <p.zabel@...gutronix.de>, linux-usb@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	asahi@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
	linux-phy@...ts.infradead.org
Subject: Re: [PATCH RFC 12/22] usb: typec: tipd: Add cd321x struct with
 separate size

On Thu, Aug 21, 2025 at 03:39:04PM +0000, Sven Peter wrote:
> We're about to add more fields to struct tps6598x which are only relevant
> for Apple's CD321x and to ensure that we don't waste memory everywhere for
> those add a separate struct for cd321x and prepare to allocate more space
> inside probe.
> 
> Signed-off-by: Sven Peter <sven@...nel.org>

Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>

> ---
>  drivers/usb/typec/tipd/core.c | 20 +++++++++++++++-----
>  1 file changed, 15 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/usb/typec/tipd/core.c b/drivers/usb/typec/tipd/core.c
> index 19d713937870304e68325a441b0de63eb5db3b80..51b0f3be8b66a743ddc3ea96c1b25f597a1e8f6c 100644
> --- a/drivers/usb/typec/tipd/core.c
> +++ b/drivers/usb/typec/tipd/core.c
> @@ -113,6 +113,7 @@ struct tps6598x;
>  struct tipd_data {
>  	irq_handler_t irq_handler;
>  	u64 irq_mask1;
> +	size_t tps_struct_size;
>  	int (*register_port)(struct tps6598x *tps, struct fwnode_handle *node);
>  	void (*trace_data_status)(u32 status);
>  	void (*trace_power_status)(u16 status);
> @@ -148,6 +149,10 @@ struct tps6598x {
>  	const struct tipd_data *data;
>  };
>  
> +struct cd321x {
> +	struct tps6598x tps;
> +};
> +
>  static enum power_supply_property tps6598x_psy_props[] = {
>  	POWER_SUPPLY_PROP_USB_TYPE,
>  	POWER_SUPPLY_PROP_ONLINE,
> @@ -1297,18 +1302,24 @@ tps25750_register_port(struct tps6598x *tps, struct fwnode_handle *fwnode)
>  
>  static int tps6598x_probe(struct i2c_client *client)
>  {
> +	const struct tipd_data *data;
>  	struct tps6598x *tps;
>  	struct fwnode_handle *fwnode;
>  	u32 status;
>  	u32 vid;
>  	int ret;
>  
> -	tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
> +	data = i2c_get_match_data(client);
> +	if (!data)
> +		return -EINVAL;
> +
> +	tps = devm_kzalloc(&client->dev, data->tps_struct_size, GFP_KERNEL);
>  	if (!tps)
>  		return -ENOMEM;
>  
>  	mutex_init(&tps->lock);
>  	tps->dev = &client->dev;
> +	tps->data = data;
>  
>  	tps->reset = devm_gpiod_get_optional(tps->dev, "reset", GPIOD_OUT_LOW);
>  	if (IS_ERR(tps->reset))
> @@ -1334,10 +1345,6 @@ static int tps6598x_probe(struct i2c_client *client)
>  	if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
>  		tps->i2c_protocol = true;
>  
> -	tps->data = i2c_get_match_data(client);
> -	if (!tps->data)
> -		return -EINVAL;
> -
>  	if (tps->data->switch_power_state) {
>  		ret = tps->data->switch_power_state(tps, TPS_SYSTEM_POWER_STATE_S0);
>  		if (ret)
> @@ -1521,6 +1528,7 @@ static const struct tipd_data cd321x_data = {
>  	.irq_mask1 = APPLE_CD_REG_INT_POWER_STATUS_UPDATE |
>  		     APPLE_CD_REG_INT_DATA_STATUS_UPDATE |
>  		     APPLE_CD_REG_INT_PLUG_EVENT,
> +	.tps_struct_size = sizeof(struct cd321x),
>  	.register_port = tps6598x_register_port,
>  	.trace_data_status = trace_cd321x_data_status,
>  	.trace_power_status = trace_tps6598x_power_status,
> @@ -1535,6 +1543,7 @@ static const struct tipd_data tps6598x_data = {
>  	.irq_mask1 = TPS_REG_INT_POWER_STATUS_UPDATE |
>  		     TPS_REG_INT_DATA_STATUS_UPDATE |
>  		     TPS_REG_INT_PLUG_EVENT,
> +	.tps_struct_size = sizeof(struct tps6598x),
>  	.register_port = tps6598x_register_port,
>  	.trace_data_status = trace_tps6598x_data_status,
>  	.trace_power_status = trace_tps6598x_power_status,
> @@ -1549,6 +1558,7 @@ static const struct tipd_data tps25750_data = {
>  	.irq_mask1 = TPS_REG_INT_POWER_STATUS_UPDATE |
>  		     TPS_REG_INT_DATA_STATUS_UPDATE |
>  		     TPS_REG_INT_PLUG_EVENT,
> +	.tps_struct_size = sizeof(struct tps6598x),
>  	.register_port = tps25750_register_port,
>  	.trace_data_status = trace_tps6598x_data_status,
>  	.trace_power_status = trace_tps25750_power_status,
> 
> -- 
> 2.34.1
> 

-- 
heikki