linux-kernel - Re: rtc: NXP pcf8563 vs Haoyu hym8563

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Date:	Mon, 27 Oct 2014 16:41:34 +0100
From:	Heiko Stübner <heiko@...ech.de>
To:	Jan Kardell <jan.kardell@...liq.com>
Cc:	Alessandro Zummo <a.zummo@...ertech.it>,
	rtc-linux@...glegroups.com, linux-kernel@...r.kernel.org,
	Vincent Donnefort <vdonnefort@...il.com>,
	Dan Carpenter <dan.carpenter@...cle.com>
Subject: Re: rtc: NXP pcf8563 vs Haoyu hym8563

Hi Jan,

Am Montag, 27. Oktober 2014, 15:42:11 schrieb Jan Kardell:
> Hi,
> 
> Erlier this year the hym8563 driver was added to the kernel. When I compared
> the datasheets of the NXP pcf8563 (that I use) and the Haoyu hym8563 I
> cannot
> find any significantdifferences between the two chips. Now is using
> different
> drivers for the two similar (or identical?) chips:
> a) A mistake
> b) A feature
> c) Me beeing stupid?

option A - a mistake

At the time I didn't check existing drivers for one with a compatible 
interface - wrongly thinking different vendors wouldn't use the same 
interfaces.

I learned from this and am not making this mistake again [0] :-), but haven't 
had the time so far to consolidate the two rtc drivers back into one.


> The difference between the drivers is handling of century and that the
> hym8563
> driver support the clock output that both chips have.

Feel free to consolidate them if you have time to spare - alternativly I 
hopefully also will have time for this some time in the future.


Heiko


[0] https://lkml.org/lkml/2014/9/14/178
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