linux-kernel - Re: [PATCH 3/4] rtc: cros-ec: add cros-ec-rtc driver.

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Message-ID: <20170118020021.rnfchgbmtnrbljck@piout.net>
Date:   Wed, 18 Jan 2017 03:00:21 +0100
From:   Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:     Enric Balletbo i Serra <enric.balletbo@...labora.com>
Cc:     linux-kernel@...r.kernel.org, rtc-linux@...glegroups.com,
        Olof Johansson <olof@...om.net>,
        Lee Jones <lee.jones@...aro.org>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Stephen Barber <smbarber@...omium.org>
Subject: Re: [PATCH 3/4] rtc: cros-ec: add cros-ec-rtc driver.


Hi,

This seems mostly good to me.

On 11/01/2017 at 17:52:20 +0100, Enric Balletbo i Serra wrote :
> From: Stephen Barber <smbarber@...omium.org>
> 
> On platforms with a Chrome OS EC, the EC can function as a simple RTC.
> Add a basic driver with this functionality.
> 
> Signed-off-by: Stephen Barber <smbarber@...omium.org>
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
> ---
>  drivers/rtc/Kconfig       |  10 ++
>  drivers/rtc/Makefile      |   1 +
>  drivers/rtc/rtc-cros-ec.c | 416 ++++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 427 insertions(+)
>  create mode 100644 drivers/rtc/rtc-cros-ec.c
> 
> diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
> index c93c5a8..b58ce06 100644
> --- a/drivers/rtc/Kconfig
> +++ b/drivers/rtc/Kconfig
> @@ -207,6 +207,16 @@ config RTC_DRV_AS3722
>  	  This driver can also be built as a module. If so, the module
>  	  will be called rtc-as3722.
>  
> +config RTC_DRV_CROS_EC
> +	tristate "Chrome OS EC RTC driver"
> +	depends on MFD_CROS_EC
> +	help
> +	  If you say yes here you will get support for the
> +	  Chrome OS Embedded Controller's RTC.
> +
> +	  This driver can also be built as a module. If so, the module
> +	  will be called rtc-cros-ec.
> +

This doesn't look like and i2c RTC, you probably want to put that block
somewhere after "Platform RTC drivers"

>  config RTC_DRV_DS1307
>  	tristate "Dallas/Maxim DS1307/37/38/39/40, ST M41T00, EPSON RX-8025, ISL12057"
>  	help


> +	ret = rtc_valid_tm(&tm);
> +	if (ret)
> +		dev_err(&pdev->dev, "invalid date/time\n");
> +
nitpick: I'm not sure this is useful. You'll probably know soon enough
that it is invalid as I'm pretty sure something will read the date at
boot time.


-- 
Alexandre Belloni, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com