linux-kernel - Re: [PATCH] rtc: jz4740: Add support for the JZ4725B, JZ4760, JZ4770

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Date:   Sat, 14 Jul 2018 18:24:19 +0200
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     Alessandro Zummo <a.zummo@...ertech.it>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>, linux-rtc@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rtc: jz4740: Add support for the JZ4725B, JZ4760, JZ4770

On 14/07/2018 15:50:08+0200, Paul Cercueil wrote:
> > >  > This would avoid that change (and the test would preferably be
> > >  > (rtc->type == ID_JZ4780))
> > > 
> > >  That branch should be taken if the SoC is JZ4760, JZ4770 or JZ4780.
> > >  It should not be taken if the SoC is JZ4740 or JZ4725B.
> > 
> > Sure but you can achieve that with only 2 ids...
> > 
> > > 
> > >  > >   		ret = jz4780_rtc_enable_write(rtc);
> > >  > >   	if (ret == 0)
> > >  > >   		ret = jz4740_rtc_wait_write_ready(rtc);
> > >  > >  @@ -300,6 +303,9 @@ static void jz4740_rtc_power_off(void)
> > >  > >
> > >  > >   static const struct of_device_id jz4740_rtc_of_match[] = {
> > >  > >   	{ .compatible = "ingenic,jz4740-rtc", .data = (void
> > > *)ID_JZ4740 },
> > >  > >  +	{ .compatible = "ingenic,jz4725b-rtc", .data = (void
> > > *)ID_JZ4725B
> > >  > > },
> > >  > >  +	{ .compatible = "ingenic,jz4760-rtc", .data = (void
> > > *)ID_JZ4760 },
> > >  > >  +	{ .compatible = "ingenic,jz4770-rtc", .data = (void
> > > *)ID_JZ4770 },
> > 
> > By doing the correct mapping here e.g:
> > 
> > { .compatible = "ingenic,jz4725b-rtc", .data = (void *)ID_JZ4740 },
> 
> Not very pretty and future-proof if you ask me...
> But you're the boss...
> 

I think it makes the code simpler to follow . Regarding future
proofness, you will have to add code and probably use a switch case at
the time you need to handle an RTC differently. At that time, the >=
test trick will not work anymore anyway.


-- 
Alexandre Belloni, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com