linux-kernel - Re: [PATCH v10 3/8] i2c: thunderx: Add i2c driver for ThunderX SOC

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Date:   Tue, 23 Aug 2016 22:36:29 +0200
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Jan Glauber <jglauber@...ium.com>
Cc:     linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org,
        David Daney <ddaney@...iumnetworks.com>,
        Steven.Hill@...iumnetworks.com
Subject: Re: [PATCH v10 3/8] i2c: thunderx: Add i2c driver for ThunderX SOC


>  i2c-octeon-objs := i2c-cavium.o i2c-octeon-core.o
>  obj-$(CONFIG_I2C_OCTEON)	+= i2c-octeon.o
> +i2c-thunderx-objs := i2c-cavium.o i2c-thunderx-core.o
> +obj-$(CONFIG_I2C_THUNDERX)	+= i2c-thunderx.o

Shouldn't that rather be "i2c-cavium-core.o", "i2c-octeon-platdrv.o",
and "i2c-thunderx-pcidrv.o" for the -objs? I mean, the cavium part is
the core-part...

> +skip:
> +	if (!i2c->sys_freq)
> +		i2c->sys_freq = SYS_FREQ_DEFAULT;
> +
> +	dev_info(dev, "Set system clock to %u\n", i2c->sys_freq);

Too many dev_info IMO, see later.

> +	i2c->adap.class = I2C_CLASS_HWMON | I2C_CLASS_SPD;

Do you really need that?

> +	ret = i2c_add_adapter(&i2c->adap);
> +	if (ret < 0) {
> +		dev_err(dev, "Failed to add i2c adapter\n");

I2C core does error reporting for you meanwhile.

> +		goto out_irq;
> +	}
> +
> +	dev_info(i2c->dev, "probed\n");

I'd think all nice to know dev_info should go here in condensed form.

> +out_irq:
> +	devm_free_irq(dev, i2c->i2c_msix.vector, i2c);

If you need to free irq manually here anyhow, then you don't need the
devm variant.

> +out_msix:
> +	pci_disable_msix(pdev);
> +out_unmap:
> +	iounmap(i2c->twsi_base);
> +	thunder_i2c_clock_disable(dev, i2c->clk);
> +out_release_regions:
> +	pci_release_regions(pdev);
> +out_disable_device:
> +	pci_disable_device(pdev);
> +out_free_i2c:
> +	pci_set_drvdata(pdev, NULL);

Similar to devm_*, there is also pcim_* for PCI devices. You might want
to have a look for those.

> +	devm_kfree(dev, i2c);

Not needed.

> +	return ret;
> +}
> +
> +static void thunder_i2c_remove_pci(struct pci_dev *pdev)
> +{
> +	struct octeon_i2c *i2c = pci_get_drvdata(pdev);
> +	struct device *dev;
> +
> +	if (!i2c)
> +		return;

How should that happen?

> +
> +module_pci_driver(thunder_i2c_pci_driver);
> +
> +MODULE_LICENSE("GPL");

Please add a minimal GPL header at the top of the file, so it is clear
if you mean "v2" or "v2 or later".

> +MODULE_AUTHOR("Fred Martin <fmartin@...iumnetworks.com>");
> +MODULE_DESCRIPTION("I2C-Bus adapter for Cavium ThunderX SOC");
> -- 
> 1.9.1
> 

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