linux-kernel - Re: [PATCH v2 2/2] rtc: add rtc-abx80x, a driver for the Abracon AB x80x i2c rtc

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Date:	Thu, 9 Apr 2015 15:31:22 +0200
From:	Philippe De Muyter <phdm@...qel.be>
To:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	rtc-linux@...glegroups.com, linux-kernel@...r.kernel.org,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v2 2/2] rtc: add rtc-abx80x, a driver for the Abracon
	AB x80x i2c rtc

Hi Alexandre,

On Wed, Apr 01, 2015 at 04:52:23AM +0200, Alexandre Belloni wrote:
> From: Philippe De Muyter <phdm@...qel.be>
> 
> This is a basic driver for the ultra-low-power Abracon AB x80x series of RTC
> chips. It supports in particular, the supersets AB0805 and AB1805.
> It allows reading and writing the time, and enables the supercapacitor/
> battery charger.
> 
> [arnd@...db.de: abx805 depends on i2c]
> Signed-off-by: Philippe De Muyter <phdm@...qel.be>
> Cc: Alessandro Zummo <a.zummo@...ertech.it>
> Signed-off-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
> ---
...
> +static int abx80x_rtc_read_time(struct device *dev, struct rtc_time *tm)
> +{
> +	struct i2c_client *client = to_i2c_client(dev);
> +	unsigned char date[8];
> +	int err;
> +
> +	err = i2c_smbus_read_i2c_block_data(client, ABX8XX_REG_HTH,
> +					    sizeof(date), date);
> +	if (err < 0) {
> +		dev_err(&client->dev, "Unable to read date\n");
> +		return -EIO;
> +	}
> +
> +	tm->tm_sec = bcd2bin(date[ABX8XX_REG_SC] & 0x7F);
> +	tm->tm_min = bcd2bin(date[ABX8XX_REG_MN] & 0x7F);
> +	tm->tm_hour = bcd2bin(date[ABX8XX_REG_HR] & 0x3F);
> +	tm->tm_wday = date[ABX8XX_REG_WD] & 0x7;
> +	tm->tm_mday = bcd2bin(date[ABX8XX_REG_DA] & 0x3F);
> +	tm->tm_mon = bcd2bin(date[ABX8XX_REG_MO] & 0x1F) - 1;
> +	tm->tm_year = bcd2bin(date[ABX8XX_REG_YR]) + 100;

Just a minor nit: I would rather not name the buffer 'date', but 'buf' like
in abx80x_rtc_set_time.

> +
> +	err = rtc_valid_tm(tm);
> +	if (err < 0)
> +		dev_err(&client->dev, "retrieved date/time is not valid.\n");
> +
> +	return err;
> +}
> +
> +static int abx80x_rtc_set_time(struct device *dev, struct rtc_time *tm)
> +{
> +	struct i2c_client *client = to_i2c_client(dev);
> +	unsigned char buf[8];
> +	int err;
> +
...
> +static const struct i2c_device_id abx80x_id[] = {
> +	{ "abx80x", ABX80X },

should become
	{ "abx80x-rtc", ABX80X },
> +	{ "ab0801", AB0801 },
> +	{ "ab0803", AB0803 },
> +	{ "ab0804", AB0804 },
> +	{ "ab0805", AB0805 },
> +	{ "ab1801", AB1801 },
> +	{ "ab1803", AB1803 },
> +	{ "ab1804", AB1804 },
> +	{ "ab1805", AB1805 },
> +	{ }
and likewise

Best regards

Philippe

-- 
Philippe De Muyter +32 2 6101532 Macq SA rue de l'Aeronef 2 B-1140 Bruxelles
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