linux-kernel - Re: [PATCH v3 2/4] usb: typec: Add support for Parade PS8830 Type-C Retimer

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Message-ID: <ZxeyoRYPZP3Feg6T@kuha.fi.intel.com>
Date: Tue, 22 Oct 2024 17:11:45 +0300
From: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To: Abel Vesa <abel.vesa@...aro.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>, linux-arm-msm@...r.kernel.org,
	Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konradybcio@...nel.org>,
	Rajendra Nayak <quic_rjendra@...cinc.com>,
	Sibi Sankar <quic_sibis@...cinc.com>,
	Johan Hovold <johan@...nel.org>,
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
	Trilok Soni <quic_tsoni@...cinc.com>, linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v3 2/4] usb: typec: Add support for Parade PS8830 Type-C
 Retimer

Hi,

Couple of nitpicks.

On Tue, Oct 22, 2024 at 01:26:55PM +0300, Abel Vesa wrote:
> +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;
> +	bool skip_reset = false;
> +	int ret;
> +
> +	retimer = devm_kzalloc(dev, sizeof(*retimer), GFP_KERNEL);
> +	if (!retimer)
> +		return -ENOMEM;
> +
> +	retimer->client = client;
> +
> +	mutex_init(&retimer->lock);
> +
> +	if (of_property_read_bool(dev->of_node, "ps8830,boot-on"))
> +		skip_reset = true;

        skip_reset = device_property_present(dev, "ps8830,boot-on");

> +	retimer->regmap = devm_regmap_init_i2c(client, &ps8830_retimer_regmap);
> +	if (IS_ERR(retimer->regmap)) {
> +		ret = PTR_ERR(retimer->regmap);
> +		dev_err(dev, "failed to allocate register map: %d\n", ret);
> +		return ret;
> +	}
> +
> +	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",
> +					     skip_reset ? GPIOD_OUT_LOW : 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);

	retimer->typec_switch = typec_switch_get(dev);

> +	if (IS_ERR(retimer->typec_switch))
> +		return dev_err_probe(dev, PTR_ERR(retimer->typec_switch),
> +				     "failed to acquire orientation-switch\n");
> +
> +	retimer->typec_mux = fwnode_typec_mux_get(dev->fwnode);

	retimer->typec_mux = typec_mux_get(dev);

> +	if (IS_ERR(retimer->typec_mux)) {
> +		ret = dev_err_probe(dev, PTR_ERR(retimer->typec_mux),
> +				    "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)) {
> +		ret = PTR_ERR(retimer->sw);
> +		dev_err(dev, "failed to register typec switch: %d\n", ret);
> +		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)) {
> +		ret = PTR_ERR(retimer->retimer);
> +		dev_err(dev, "failed to register typec retimer: %d\n", ret);
> +		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);
> +
> +	if (!skip_reset)
> +		gpiod_set_value(retimer->reset_gpio, 0);
> +
> +	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:
> +	if (!skip_reset)
> +		gpiod_set_value(retimer->reset_gpio, 1);
> +
> +	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;
> +}

thanks,

-- 
heikki