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Date: Thu, 4 Jan 2024 18:14:37 +0200
From: Roger Quadros <rogerq@...nel.org>
To: Javier Carrasco <javier.carrasco@...fvision.net>,
Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/4] usb: typec: tipd: add init and reset functions to
tipd_data
On 14/12/2023 18:29, Javier Carrasco wrote:
> The current implementation includes a number of special cases for the
> tps25750. Nevertheless, init and reset functions can be generalized by
> adding function pointers to the tipd_data structure in order to offer
> that functionality to other parts without additional conditional
> clauses.
>
> Some functionality like the cold reset request (GAID) is shared by the
> tps25750 and the tps6598x, so they can use the same reset function.
>
> Signed-off-by: Javier Carrasco <javier.carrasco@...fvision.net>
> ---
> drivers/usb/typec/tipd/core.c | 45 +++++++++++++++++++++++++++++++++----------
> 1 file changed, 35 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/usb/typec/tipd/core.c b/drivers/usb/typec/tipd/core.c
> index 806ef68273ca..f0c4cd571a37 100644
> --- a/drivers/usb/typec/tipd/core.c
> +++ b/drivers/usb/typec/tipd/core.c
> @@ -115,6 +115,8 @@ struct tipd_data {
> void (*trace_power_status)(u16 status);
> void (*trace_status)(u32 status);
> int (*apply_patch)(struct tps6598x *tps);
> + int (*init)(struct tps6598x *tps);
> + int (*reset)(struct tps6598x *tps);
> };
>
> struct tps6598x {
> @@ -1106,6 +1108,11 @@ static int tps25750_apply_patch(struct tps6598x *tps)
> return 0;
> };
>
> +static int cd321x_init(struct tps6598x *tps)
> +{
> + return 0;
> +}
> +
> static int tps25750_init(struct tps6598x *tps)
> {
> int ret;
> @@ -1124,6 +1131,21 @@ static int tps25750_init(struct tps6598x *tps)
> return 0;
> }
>
> +static int tps6598x_init(struct tps6598x *tps)
> +{
> + return 0;
> +}
> +
> +static int cd321x_reset(struct tps6598x *tps)
> +{
> + return 0;
> +}
> +
> +static int tps6598x_reset(struct tps6598x *tps)
> +{
> + return tps6598x_exec_cmd_tmo(tps, "GAID", 0, NULL, 0, NULL, 2000, 0);
> +}
> +
> static int
> tps25750_register_port(struct tps6598x *tps, struct fwnode_handle *fwnode)
> {
> @@ -1187,7 +1209,6 @@ static int tps6598x_probe(struct i2c_client *client)
> u32 vid;
> int ret;
> u64 mask1;
> - bool is_tps25750;
>
> tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
> if (!tps)
> @@ -1207,8 +1228,7 @@ static int tps6598x_probe(struct i2c_client *client)
> if (IS_ERR(tps->regmap))
> return PTR_ERR(tps->regmap);
>
> - is_tps25750 = device_is_compatible(tps->dev, "ti,tps25750");
> - if (!is_tps25750) {
> + if (!device_is_compatible(tps->dev, "ti,tps25750")) {
> ret = tps6598x_read32(tps, TPS_REG_VID, &vid);
> if (ret < 0 || !vid)
> return -ENODEV;
> @@ -1251,8 +1271,8 @@ static int tps6598x_probe(struct i2c_client *client)
> if (ret < 0)
> return ret;
>
> - if (is_tps25750 && ret == TPS_MODE_PTCH) {
> - ret = tps25750_init(tps);
> + if (ret == TPS_MODE_PTCH) {
> + ret = tps->data->init(tps);
> if (ret)
> return ret;
> }
> @@ -1340,8 +1360,8 @@ static int tps6598x_probe(struct i2c_client *client)
> tps6598x_write64(tps, TPS_REG_INT_MASK1, 0);
> err_reset_controller:
> /* Reset PD controller to remove any applied patch */
> - if (is_tps25750)
> - tps6598x_exec_cmd_tmo(tps, "GAID", 0, NULL, 0, NULL, 2000, 0);
> + tps->data->reset(tps);
> +
> return ret;
> }
>
> @@ -1358,8 +1378,7 @@ static void tps6598x_remove(struct i2c_client *client)
> usb_role_switch_put(tps->role_sw);
>
> /* Reset PD controller to remove any applied patch */
> - if (device_is_compatible(tps->dev, "ti,tps25750"))
> - tps6598x_exec_cmd_tmo(tps, "GAID", 0, NULL, 0, NULL, 2000, 0);
> + tps->data->reset(tps);
>
> if (tps->reset)
> gpiod_set_value_cansleep(tps->reset, 1);
> @@ -1393,7 +1412,7 @@ static int __maybe_unused tps6598x_resume(struct device *dev)
> if (ret < 0)
> return ret;
>
> - if (device_is_compatible(tps->dev, "ti,tps25750") && ret == TPS_MODE_PTCH) {
> + if (ret == TPS_MODE_PTCH) {
Won't this function will be invoked for all variants?
If so, why are we calling a tsp25750 specific function here?
> ret = tps25750_init(tps);
> if (ret)
> return ret;
> @@ -1423,6 +1442,8 @@ static const struct tipd_data cd321x_data = {
> .register_port = tps6598x_register_port,
> .trace_power_status = trace_tps6598x_power_status,
> .trace_status = trace_tps6598x_status,
> + .init = cd321x_init,
> + .reset = cd321x_reset,
> };
>
> static const struct tipd_data tps6598x_data = {
> @@ -1430,6 +1451,8 @@ static const struct tipd_data tps6598x_data = {
> .register_port = tps6598x_register_port,
> .trace_power_status = trace_tps6598x_power_status,
> .trace_status = trace_tps6598x_status,
> + .init = tps6598x_init,
> + .reset = tps6598x_reset,
> };
>
> static const struct tipd_data tps25750_data = {
> @@ -1438,6 +1461,8 @@ static const struct tipd_data tps25750_data = {
> .trace_power_status = trace_tps25750_power_status,
> .trace_status = trace_tps25750_status,
> .apply_patch = tps25750_apply_patch,
> + .init = tps25750_init,
> + .reset = tps6598x_reset,
> };
>
> static const struct of_device_id tps6598x_of_match[] = {
>
--
cheers,
-roger
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