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

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Message-ID: <202303080844360ced8b82@mail.local>
Date:   Wed, 8 Mar 2023 09:44:36 +0100
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Svyatoslav Ryhel <clamor95@...il.com>
Cc:     Chanwoo Choi <cw00.choi@...sung.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        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

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

> +	if (ret)
> +		rtc_i2c_addr = info->drv_data->rtc_i2c_addr;
> +
>  	info->rtc = devm_i2c_new_dummy_device(info->dev, parent_i2c->adapter,
> -					      info->drv_data->rtc_i2c_addr);
> +					      rtc_i2c_addr);
>  	if (IS_ERR(info->rtc)) {
>  		dev_err(info->dev, "Failed to allocate I2C device for RTC\n");
>  		return PTR_ERR(info->rtc);
> -- 
> 2.37.2
> 

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