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

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Message-Id: <1531574734.2831.0@smtp.crapouillou.net>
Date:   Sat, 14 Jul 2018 15:25:33 +0200
From:   Paul Cercueil <paul@...pouillou.net>
To:     Alexandre Belloni <alexandre.belloni@...tlin.com>
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

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.

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