linux-kernel - Re: [PATCH v1] max77663-rtc: pass rtc address from device tree node if exists

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Date:   Wed, 8 Mar 2023 09:49:53 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Svyatoslav Ryhel <clamor95@...il.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>
Cc:     Chanwoo Choi <cw00.choi@...sung.com>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        linux-kernel@...r.kernel.org, linux-rtc@...r.kernel.org
Subject: Re: [PATCH v1] max77663-rtc: pass rtc address from device tree node
 if exists

On 08/03/2023 09:46, Svyatoslav Ryhel wrote:
> ср, 8 бер. 2023 р. о 10:44 Alexandre Belloni
> <alexandre.belloni@...tlin.com> пише:
>>
>> Hello,
>>
>> the subject is not correct, please use the subsystem style
>>
>> On 08/03/2023 10:37:59+0200, Svyatoslav Ryhel wrote:
>>> MAX77663 PMIC can have RTC on both 0x63 i2c address (like grouper)
>>> which is main address but on some devices RTC is located on 0x48
>>> i2c address (like p880 and p895 from LG). Lets add property to be
>>> able to use alternative address if needed without breaking existing
>>> bindings.
>>>
>>> Signed-off-by: Svyatoslav Ryhel <clamor95@...il.com>
>>> ---
>>>  drivers/rtc/rtc-max77686.c | 8 +++++++-
>>>  1 file changed, 7 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/rtc/rtc-max77686.c b/drivers/rtc/rtc-max77686.c
>>> index b0250d91fb00..218177375531 100644
>>> --- a/drivers/rtc/rtc-max77686.c
>>> +++ b/drivers/rtc/rtc-max77686.c
>>> @@ -691,6 +691,7 @@ static int max77686_init_rtc_regmap(struct max77686_rtc_info *info)
>>>  {
>>>       struct device *parent = info->dev->parent;
>>>       struct i2c_client *parent_i2c = to_i2c_client(parent);
>>> +     int rtc_i2c_addr;
>>>       int ret;
>>>
>>>       if (info->drv_data->rtc_irq_from_platform) {
>>> @@ -714,8 +715,13 @@ static int max77686_init_rtc_regmap(struct max77686_rtc_info *info)
>>>               goto add_rtc_irq;
>>>       }
>>>
>>> +     ret = device_property_read_u32(parent, "maxim,rtc-i2c-address",
>>> +                                    &rtc_i2c_addr);
>>
>> This property needs to be documented
>>
> 
> max776xx pmic has no yaml to document

Of course it has, otherwise on what did I work?

git grep max77686


Best regards,
Krzysztof