linux-kernel - Re: [PATCH v12 2/3] i2c: npcm7xx: Add Nuvoton NPCM I2C controller driver

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Message-ID: <20200521142340.GM1634618@smile.fi.intel.com>
Date:   Thu, 21 May 2020 17:23:40 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Tali Perry <tali.perry1@...il.com>
Cc:     ofery@...gle.com, brendanhiggins@...gle.com,
        avifishman70@...il.com, tmaimon77@...il.com, kfting@...oton.com,
        venture@...gle.com, yuenn@...gle.com, benjaminfair@...gle.com,
        robh+dt@...nel.org, wsa@...-dreams.de,
        linux-arm-kernel@...ts.infradead.org, linux-i2c@...r.kernel.org,
        openbmc@...ts.ozlabs.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v12 2/3] i2c: npcm7xx: Add Nuvoton NPCM I2C controller
 driver

On Thu, May 21, 2020 at 02:09:09PM +0300, Tali Perry wrote:
> Add Nuvoton NPCM BMC I2C controller driver.

Thanks. My comments below.
After addressing them, FWIW,
Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

...

> +	/* Frequency larger than 1 MHZ is not supported */

1 MHZ -> 1MHz

...

> +#ifdef CONFIG_DEBUG_FS

Again, why is this here?

Have you checked debugfs.h for !CONFIG_DEBUG_FS case?

> +/* i2c debugfs directory: used to keep health monitor of i2c devices */
> +static struct dentry *npcm_i2c_debugfs_dir;
> +
> +static void i2c_init_debugfs(struct platform_device *pdev, struct npcm_i2c *bus)
> +{
> +	struct dentry *d;
> +
> +	if (!npcm_i2c_debugfs_dir)
> +		return;
> +
> +	d = debugfs_create_dir(dev_name(&pdev->dev), npcm_i2c_debugfs_dir);
> +	if (IS_ERR_OR_NULL(d))
> +		return;
> +
> +	debugfs_create_u64("ber_cnt", 0444, d, &bus->ber_cnt);
> +	debugfs_create_u64("nack_cnt", 0444, d, &bus->nack_cnt);
> +	debugfs_create_u64("rec_succ_cnt", 0444, d, &bus->rec_succ_cnt);
> +	debugfs_create_u64("rec_fail_cnt", 0444, d, &bus->rec_fail_cnt);
> +	debugfs_create_u64("timeout_cnt", 0444, d, &bus->timeout_cnt);
> +
> +	bus->debugfs = d;
> +}

> +#else
> +static void i2c_init_debugfs(struct platform_device *pdev, struct npcm_i2c *bus)
> +{
> +}

This is completely redundant.

> +#endif

...

> +#ifdef CONFIG_DEBUG_FS

Ditto.

> +static int __init npcm_i2c_init(void)
> +{
> +	struct dentry *dir;
> +
> +	dir = debugfs_create_dir("i2c", NULL);
> +	if (IS_ERR_OR_NULL(dir))
> +		return 0;
> +
> +	npcm_i2c_debugfs_dir = dir;
> +	return 0;
> +}
> +
> +static void __exit npcm_i2c_exit(void)
> +{
> +	debugfs_remove_recursive(npcm_i2c_debugfs_dir);
> +}
> +
> +module_init(npcm_i2c_init);
> +module_exit(npcm_i2c_exit);
> +#endif

...

> +MODULE_VERSION("0.1.3");

Module version is defined by kernel commit hash. But it's up to you and
subsystem maintainer to decide.

-- 
With Best Regards,
Andy Shevchenko