linux-kernel - Re: [PATCH 3/4] mfd: mt6360: Fix flow which is used to check ic exist

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Message-ID: <3205bb9b-c7b4-c99a-2673-f3a56cc0addf@gmail.com>
Date:   Fri, 10 Jul 2020 16:25:23 +0200
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Gene Chen <gene.chen.richtek@...il.com>, lee.jones@...aro.org
Cc:     linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        gene_chen@...htek.com, shufan_lee@...htek.com,
        cy_huang@...htek.com, benjamin.chao@...iatek.com
Subject: Re: [PATCH 3/4] mfd: mt6360: Fix flow which is used to check ic exist



On 07/07/2020 12:30, Gene Chen wrote:
> From: Gene Chen <gene_chen@...htek.com>
> 
> Fix flow which is used to check ic exist
> 
> Signed-off-by: Gene Chen <gene_chen@...htek.com>
> ---
>   drivers/mfd/mt6360-core.c  | 28 +++++++++++++++++++---------
>   include/linux/mfd/mt6360.h |  8 ++++----
>   2 files changed, 23 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/mfd/mt6360-core.c b/drivers/mfd/mt6360-core.c
> index 2dd5918..4bb2949 100644
> --- a/drivers/mfd/mt6360-core.c
> +++ b/drivers/mfd/mt6360-core.c
> @@ -293,6 +293,23 @@ static const struct mfd_cell mt6360_devs[] = {
>   		    NULL, 0, 0, "mediatek,mt6360-tcpc"),
>   };
>   
> +static int mt6360_check_vendor_info(struct mt6360_data *data)
> +{
> +	u32 info;
> +	int ret;
> +
> +	ret = regmap_read(data->regmap, MT6360_REG_PMU_DEVINFO, &info);
> +	if (ret < 0)
> +		return ret;
> +
> +	if ((info & MT6360_CHIPVEN_MASK) != MT6360_CHIPVEN_VAL)
> +		return -ENODEV;
> +
> +	data->chip_rev = info & MT6360_CHIPREV_MASK;
> +
> +	return 0;
> +}
> +
>   static const unsigned short mt6360_slave_addr[MT6360_SLAVE_MAX] = {
>   	MT6360_PMU_SLAVEID,
>   	MT6360_PMIC_SLAVEID,
> @@ -303,7 +320,6 @@ static const unsigned short mt6360_slave_addr[MT6360_SLAVE_MAX] = {
>   static int mt6360_probe(struct i2c_client *client)
>   {
>   	struct mt6360_data *data;
> -	unsigned int reg_data;
>   	int i, ret;
>   
>   	data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
> @@ -319,16 +335,10 @@ static int mt6360_probe(struct i2c_client *client)
>   		return PTR_ERR(data->regmap);
>   	}
>   
> -	ret = regmap_read(data->regmap, MT6360_PMU_DEV_INFO, &reg_data);
> +	ret = mt6360_check_vendor_info(data);
>   	if (ret) {
> -		dev_err(&client->dev, "Device not found\n");
> -		return ret;
> -	}
> -
> -	data->chip_rev = reg_data & CHIP_REV_MASK;
> -	if (data->chip_rev != CHIP_VEN_MT6360) {

Why not only applying the MASK here instead of put this all in a new function?

>   		dev_err(&client->dev, "Device not supported\n");
> -		return -ENODEV;
> +		return ret;
>   	}
>   
>   	ret = devm_regmap_add_irq_chip(&client->dev, data->regmap, client->irq,
> diff --git a/include/linux/mfd/mt6360.h b/include/linux/mfd/mt6360.h
> index 9fc6718..5ec0f5d 100644
> --- a/include/linux/mfd/mt6360.h
> +++ b/include/linux/mfd/mt6360.h
> @@ -30,7 +30,7 @@ struct mt6360_data {
>   };
>   
>   /* PMU register defininition */
> -#define MT6360_PMU_DEV_INFO			(0x00)
> +#define MT6360_REG_PMU_DEVINFO			(0x00)
>   #define MT6360_PMU_CORE_CTRL1			(0x01)
>   #define MT6360_PMU_RST1				(0x02)
>   #define MT6360_PMU_CRCEN			(0x03)
> @@ -233,8 +233,8 @@ struct mt6360_data {
>   #define MT6360_IRQ_REGNUM	16
>   #define MT6360_IRQ_RETRIG	BIT(2)
>   
> -#define CHIP_VEN_MASK				(0xF0)
> -#define CHIP_VEN_MT6360				(0x50)
> -#define CHIP_REV_MASK				(0x0F)
> +#define MT6360_CHIPVEN_MASK			(0xF0)
> +#define MT6360_CHIPVEN_VAL			(0x50)
> +#define MT6360_CHIPREV_MASK			(0x0F)

Same here as in the other patches. Don't just rename defines if there is no good 
reason.

Regards,
Matthias

>   
>   #endif /* __MT6360_H__ */
>