On 24-10-22 09:41:42, Christophe JAILLET wrote:
> Le 04/10/2024 à 15:57, Abel Vesa a écrit :
> > The Parade PS8830 is a Type-C muti-protocol retimer controlled over I2C.
> > It provides both altmode and orientation handling.
> >
> > Add a driver with support for the following modes:
> > - DP 4lanes
> > - DP 2lanes + USB3
> > - USB3
> >
> > Signed-off-by: Abel Vesa <abel.vesa@xxxxxxxxxx>
> > ---
>
> Hi,
>
> > +static int ps8830_retimer_probe(struct i2c_client *client)
> > +{
> > + struct device *dev = &client->dev;
> > + struct typec_switch_desc sw_desc = { };
> > + struct typec_retimer_desc rtmr_desc = { };
> > + struct ps8830_retimer *retimer;
> > + int ret;
> > +
> > + retimer = devm_kzalloc(dev, sizeof(*retimer), GFP_KERNEL);
> > + if (!retimer)
> > + return -ENOMEM;
> > +
> > + retimer->client = client;
> > +
> > + mutex_init(&retimer->lock);
> > +
> > + retimer->regmap = devm_regmap_init_i2c(client, &ps8830_retimer_regmap);
> > + if (IS_ERR(retimer->regmap)) {
> > + dev_err(dev, "failed to allocate register map\n");
> > + return PTR_ERR(retimer->regmap);
> > + }
> > +
> > + ret = ps8830_get_vregs(retimer);
> > + if (ret)
> > + return ret;
> > +
> > + retimer->xo_clk = devm_clk_get(dev, "xo");
> > + if (IS_ERR(retimer->xo_clk))
> > + return dev_err_probe(dev, PTR_ERR(retimer->xo_clk),
> > + "failed to get xo clock\n");
> > +
> > + retimer->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
> > + if (IS_ERR(retimer->reset_gpio))
> > + return dev_err_probe(dev, PTR_ERR(retimer->reset_gpio),
> > + "failed to get reset gpio\n");
> > +
> > + retimer->typec_switch = fwnode_typec_switch_get(dev->fwnode);
> > + if (IS_ERR(retimer->typec_switch)) {
> > + dev_err(dev, "failed to acquire orientation-switch\n");
> > + return PTR_ERR(retimer->typec_switch);
> > + }
> > +
> > + retimer->typec_mux = fwnode_typec_mux_get(dev->fwnode);
> > + if (IS_ERR(retimer->typec_mux)) {
> > + dev_err(dev, "failed to acquire mode-mux\n");
> > + goto err_switch_put;
> > + }
> > +
> > + sw_desc.drvdata = retimer;
> > + sw_desc.fwnode = dev_fwnode(dev);
> > + sw_desc.set = ps8830_sw_set;
> > +
> > + ret = drm_aux_bridge_register(dev);
> > + if (ret)
> > + goto err_mux_put;
> > +
> > + retimer->sw = typec_switch_register(dev, &sw_desc);
> > + if (IS_ERR(retimer->sw)) {
> > + dev_err(dev, "failed to register typec switch\n");
> > + goto err_aux_bridge_unregister;
> > + }
> > +
> > + rtmr_desc.drvdata = retimer;
> > + rtmr_desc.fwnode = dev_fwnode(dev);
> > + rtmr_desc.set = ps8830_retimer_set;
> > +
> > + retimer->retimer = typec_retimer_register(dev, &rtmr_desc);
> > + if (IS_ERR(retimer->retimer)) {
> > + dev_err(dev, "failed to register typec retimer\n");
> > + goto err_switch_unregister;
> > + }
> > +
> > + ret = clk_prepare_enable(retimer->xo_clk);
> > + if (ret) {
> > + dev_err(dev, "failed to enable XO: %d\n", ret);
> > + goto err_retimer_unregister;
> > + }
> > +
> > + ret = ps8830_enable_vregs(retimer);
> > + if (ret)
> > + goto err_clk_disable;
> > +
> > + /* delay needed as per datasheet */
> > + usleep_range(4000, 14000);
> > +
> > + gpiod_set_value(retimer->reset_gpio, 1);
> > +
> > + return 0;
> > +
> > +err_clk_disable:
> > + clk_disable_unprepare(retimer->xo_clk);
> > +
> > +err_retimer_unregister:
> > + typec_retimer_unregister(retimer->retimer);
> > +
> > +err_switch_unregister:
> > + typec_switch_unregister(retimer->sw);
> > +
> > +err_aux_bridge_unregister:
> > + gpiod_set_value(retimer->reset_gpio, 0);
>
> Is this called useful here?
> gpiod_set_value(, 1) has not been called yet.
>
> It made sense to have something like that in v1, but it looks strange in v2.
>
The devm_gpiod_get() flag sets it to HIGH.
Anyway, this will be reworked in v3 as the reset gpio is active low.
> CJ
>
> > + clk_disable_unprepare(retimer->xo_clk);
> > +
> > +err_mux_put:
> > + typec_mux_put(retimer->typec_mux);
> > +
> > +err_switch_put:
> > + typec_switch_put(retimer->typec_switch);
> > +
> > + return ret;
> > +}
>
> ...
