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

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Message-ID: <YrmtzDfFm17PFl2r@kuha.fi.intel.com>
Date:   Mon, 27 Jun 2022 16:17:00 +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

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?


> +	return 0;
> +
> +freeirq:
> +	free_irq(client->irq, g0);
> +destroy:
> +	ucsi_destroy(g0->ucsi);
> +
> +	return ret;
> +}


thanks,

-- 
heikki