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

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Date:   Sat, 14 Jul 2018 15:32:50 +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 15:25:33+0200, Paul Cercueil wrote:
> Hi Alexandre,
> 
> Le sam. 14 juil. 2018 à 15:19, Alexandre Belloni
> <alexandre.belloni@...tlin.com> a écrit :
> > Hello,
> > 
> > On 13/07/2018 17:14:24+0200, Paul Cercueil wrote:
> > >  The RTC in the JZ4725B works just like the one in the JZ4740.
> > > 
> > >  The RTC in the JZ4760 and JZ4770 work just like the one in the
> > > JZ4780.
> > > 
> > >  Signed-off-by: Paul Cercueil <paul@...pouillou.net>
> > >  ---
> > >   Documentation/devicetree/bindings/rtc/ingenic,jz4740-rtc.txt |  3
> > > +++
> > >   drivers/rtc/rtc-jz4740.c                                     | 11
> > > ++++++++++-
> > >   2 files changed, 13 insertions(+), 1 deletion(-)
> > > 
> > >  diff --git
> > > a/Documentation/devicetree/bindings/rtc/ingenic,jz4740-rtc.txt
> > > b/Documentation/devicetree/bindings/rtc/ingenic,jz4740-rtc.txt
> > >  index 41c7ae18fd7b..a9e821de84f2 100644
> > >  --- a/Documentation/devicetree/bindings/rtc/ingenic,jz4740-rtc.txt
> > >  +++ b/Documentation/devicetree/bindings/rtc/ingenic,jz4740-rtc.txt
> > >  @@ -4,6 +4,9 @@ Required properties:
> > > 
> > >   - compatible: One of:
> > >     - "ingenic,jz4740-rtc" - for use with the JZ4740 SoC
> > >  +  - "ingenic,jz4725b-rtc" - for use with the JZ4725B SoC
> > >  +  - "ingenic,jz4760-rtc" - for use with the JZ4760 SoC
> > >  +  - "ingenic,jz4770-rtc" - for use with the JZ4770 SoC
> > >     - "ingenic,jz4780-rtc" - for use with the JZ4780 SoC
> > >   - reg: Address range of rtc register set
> > >   - interrupts: IRQ number for the alarm interrupt
> > >  diff --git a/drivers/rtc/rtc-jz4740.c b/drivers/rtc/rtc-jz4740.c
> > >  index d0a891777f44..1c867e3a0ea5 100644
> > >  --- a/drivers/rtc/rtc-jz4740.c
> > >  +++ b/drivers/rtc/rtc-jz4740.c
> > >  @@ -54,6 +54,9 @@
> > > 
> > >   enum jz4740_rtc_type {
> > >   	ID_JZ4740,
> > >  +	ID_JZ4725B,
> > >  +	ID_JZ4760,
> > >  +	ID_JZ4770,
> > 
> > I wouldn't introduce those ids unless there are handling differences at
> > some point.
> 
> Well there are handling differences, see below.
> 
> > >   	ID_JZ4780,
> > >   };
> > > 
> > >  @@ -114,7 +117,7 @@ static inline int jz4740_rtc_reg_write(struct
> > > jz4740_rtc *rtc, size_t reg,
> > >   {
> > >   	int ret = 0;
> > > 
> > >  -	if (rtc->type >= ID_JZ4780)
> > >  +	if (rtc->type >= ID_JZ4760)
> > 
> > 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 },

> > >   	{ .compatible = "ingenic,jz4780-rtc", .data = (void *)ID_JZ4780 },
> > >   	{},
> > >   };
> > >  @@ -428,6 +434,9 @@ static const struct dev_pm_ops jz4740_pm_ops = {
> > > 
> > >   static const struct platform_device_id jz4740_rtc_ids[] = {
> > >   	{ "jz4740-rtc", ID_JZ4740 },
> > >  +	{ "jz4725b-rtc", ID_JZ4725B },
> > >  +	{ "jz4760-rtc", ID_JZ4760 },
> > >  +	{ "jz4770-rtc", ID_JZ4770 },

And here

> > >   	{ "jz4780-rtc", ID_JZ4780 },
> > >   	{}
> > >   };
> > >  --
> > >  2.11.0
> > > 
> > 
> > --
> > Alexandre Belloni, Bootlin (formerly Free Electrons)
> > Embedded Linux and Kernel engineering
> > https://bootlin.com
> 

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