Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Date:   Fri, 11 Feb 2022 22:02:58 +0100
From:   Alexandre Belloni <alexandre.belloni@bootlin.com>
To:     Hugo Villeneuve <hvilleneuve@dimonoff.com>
Cc:     "hugo@hugovil.com" <hugo@hugovil.com>,
        "robh@kernel.org" <robh@kernel.org>,
        "a.zummo@towertech.it" <a.zummo@towertech.it>,
        "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
        "linux-rtc@vger.kernel.org" <linux-rtc@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 10/10] dt-bindings: rtc: pcf2127: add PCF2131 INT_A and
 INT_B support
Message-ID: <YgbPAtIO5kZ/WLhM@piout.net>
References: <20220125200009.900660-1-hugo@hugovil.com>
 <20220125200009.900660-11-hugo@hugovil.com>
 <YgMy/CYL8lmf6Y+J@robh.at.kernel.org>
 <20220210171234.4e317c8a5d5f91f358382b07@hugovil.com>
 <YgWSgGTKR63g+S9e@piout.net>
 <20220210175510.c99eb77c6367d4df5d8bb9a2@hugovil.com>
 <7be3f9541eaed7e17e334267e49665f442b1b458.camel@dimonoff.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <7be3f9541eaed7e17e334267e49665f442b1b458.camel@dimonoff.com>
Precedence: bulk

On 11/02/2022 20:16:27+0000, Hugo Villeneuve wrote:
> > > Actually, this property has to be made more generic and thought
> > > out.
> > > There are multiple RTCs that have multiple interrupt pins where one
> > > of
> > > the pin can be used for different interrupt or clock output.
> 
> Hi,
> the only example I could find of such a device is in rtc-pcf85363.c.
> This device also has two interrupt pins, INT A/B, like the PCF2131.
> However, in the pcf85363 driver, pin INT B is simply ignored, and all
> interrupts are configured to go on INT A.
> 

Yes, this was the RTC for which we had that discussion last time but
there is also pcf8523 and other non NXP RTCs.

> For the moment, I will simply modify my PCF2131 patches serie to mimic
> the same behavior in V2. This simplifies things a lot, and support for
> INT B pin could be added at a later stage (and also to pcf85363) if
> anyone needs it (I don't).
> 
> Hugo.
> 
> > > With your binding, there is no way to separate which interrupt is
> > > going
> > > to which pin and so there is no way to get the alarm and BLF or the
> > > watchdog on different pins and we certainly don't want to have a
> > > property per interrupt type.
> > 
> > Hi,
> > can you please suggest how you would prefer it to be done?
> > 
> > > Also, the documentation is missing the fact that the driver makes
> > > having
> > > one of the property mandatory.
> > 
> > I will add it.
> > 
> > Thank you, Hugo.
> > 
> 

-- 
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com