linux-kernel - Re: [PATCH 2/4] usb: typec: ucsi: stm32g0: add support for stm32g0 i2c controller

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Date:   Tue, 28 Jun 2022 12:56:30 +0300
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     Fabrice Gasnier <fabrice.gasnier@...s.st.com>
Cc:     robh+dt@...nel.org, gregkh@...uxfoundation.org,
        krzysztof.kozlowski+dt@...aro.org, devicetree@...r.kernel.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        amelie.delaunay@...s.st.com, alexandre.torgue@...s.st.com
Subject: Re: [PATCH 2/4] usb: typec: ucsi: stm32g0: add support for stm32g0
 i2c controller

On Tue, Jun 28, 2022 at 09:21:12AM +0200, Fabrice Gasnier wrote:
> On 6/27/22 15:17, Heikki Krogerus wrote:
> > Hi,
> > 
> > On Fri, Jun 24, 2022 at 05:54:11PM +0200, Fabrice Gasnier wrote:
> >> +static int ucsi_stm32g0_probe(struct i2c_client *client, const struct i2c_device_id *id)
> >> +{
> >> +	struct device *dev = &client->dev;
> >> +	struct ucsi_stm32g0 *g0;
> >> +	int ret;
> >> +
> >> +	g0 = devm_kzalloc(dev, sizeof(*g0), GFP_KERNEL);
> >> +	if (!g0)
> >> +		return -ENOMEM;
> >> +
> >> +	g0->dev = dev;
> >> +	g0->client = client;
> >> +	init_completion(&g0->complete);
> >> +	i2c_set_clientdata(client, g0);
> >> +
> >> +	g0->ucsi = ucsi_create(dev, &ucsi_stm32g0_ops);
> >> +	if (IS_ERR(g0->ucsi))
> >> +		return PTR_ERR(g0->ucsi);
> >> +
> >> +	ucsi_set_drvdata(g0->ucsi, g0);
> >> +
> >> +	/* Request alert interrupt */
> >> +	ret = request_threaded_irq(client->irq, NULL, ucsi_stm32g0_irq_handler, IRQF_ONESHOT,
> >> +				   dev_name(&client->dev), g0);
> >> +	if (ret) {
> >> +		dev_err_probe(dev, ret, "request IRQ failed\n");
> >> +		goto destroy;
> >> +	}
> >> +
> >> +	ret = ucsi_register(g0->ucsi);
> >> +	if (ret) {
> >> +		dev_err_probe(dev, ret, "ucsi_register failed\n");
> >> +		goto freeirq;
> >> +	}
> > 
> > If there isn't UCSI firmware, then ucsi_register() will always safely
> > fail here, right?
> 
> Hi Heikki,
> 
> Yes, in such a case, the first i2c read (UCSI_VERSION) in
> ucsi_register() will return an error and safely fail here.

Okay, thanks.

-- 
heikki