linux-kernel - Re: [PATCH 5/5] rtc: at91sam9: add microchip,sam9x60-rtt

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Date:   Mon, 13 Apr 2020 12:41:32 +0200
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Claudiu.Beznea@...rochip.com
Cc:     mark.rutland@....com, a.zummo@...ertech.it, jason@...edaemon.net,
        devicetree@...r.kernel.org, maz@...nel.org,
        linux-kernel@...r.kernel.org, Ludovic.Desroches@...rochip.com,
        robh+dt@...nel.org, tglx@...utronix.de,
        linux-arm-kernel@...ts.infradead.org, linux-rtc@...r.kernel.org
Subject: Re: [PATCH 5/5] rtc: at91sam9: add microchip,sam9x60-rtt

On 13/04/2020 08:50:02+0000, Claudiu.Beznea@...rochip.com wrote:
> part of 1/5 is still necessary.
> 

indeed.

> Regarding the fallback to "atmel,at91sam9260-rtt" I am aware of that. I
> chose this approach because this IP is a bit different than the one with
> "atmel,at91sam9260-rtt" compatible, meaning it has a features that the old
> one has not. I'm talking about [1] which I cannot see on a SAM9G45 [2]
> where RTT IP uses "atmel,at91sam9260-rtt" as compatible.
> 
> Is true it may be necessary in the future when new features may be
> implemented. Taking this into account, would you like to get rid of the new
> compatible in code and keep it only in device tree?
> 

What I said is not that the new compatible is not necessary at all but
that it can be avoided in the aic code.

> [1]
> http://ww1.microchip.com/downloads/en/DeviceDoc/SAM9X60-Data-Sheet-DS60001579B.pdf#_OPENTOPIC_TOC_PROCESSING_d137e64502
> [2]
> http://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-6438-32-bit-ARM926-Embedded-Microprocessor-SAM9G45_Datasheet.pdf
> 
> > 
> > I think 2/5 may be useful in the future but as far as the aic fixup
> > is concerned, both IPs are identical.
> > 
> >>  - reg: should encode the memory region of the RTT controller
> >>  - interrupts: rtt alarm/event interrupt
> >>  - clocks: should contain the 32 KHz slow clk that will drive the RTT block.
> >> --
> >> 2.7.4
> >>
> > 
> > --
> > Alexandre Belloni, Bootlin
> > Embedded Linux and Kernel engineering
> > https://bootlin.com
> > 
> > _______________________________________________
> > linux-arm-kernel mailing list
> > linux-arm-kernel@...ts.infradead.org
> > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
> > 

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

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