linux-kernel - Re: [PATCH v3 2/3] extcon: sm5502: Refactor driver to use chip-specific struct

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Date:   Thu, 3 Jun 2021 00:13:18 +0900
From:   Chanwoo Choi <cwchoi00@...il.com>
To:     Stephan Gerhold <stephan@...hold.net>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>
Cc:     Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Nikita Travkin <nikita@...n.ru>,
        ~postmarketos/upstreaming@...ts.sr.ht
Subject: Re: [PATCH v3 2/3] extcon: sm5502: Refactor driver to use
 chip-specific struct

On 21. 6. 2. 오전 5:00, Stephan Gerhold wrote:
> Prepare for supporting SM5504 in the extcon-sm5502 driver by replacing
> enum sm5504_types with a struct sm5504_type that stores the chip-specific
> definitions. This struct can then be defined separately for SM5504
> without having to add if (type == TYPE_SM5504) everywhere in the code.
> 
> Signed-off-by: Stephan Gerhold <stephan@...hold.net>
> ---
> Changes in v3: New patch to simplify diff on next patch
> ---
>   drivers/extcon/extcon-sm5502.c | 64 +++++++++++++++++++++-------------
>   drivers/extcon/extcon-sm5502.h |  4 ---
>   2 files changed, 40 insertions(+), 28 deletions(-)
> 
> diff --git a/drivers/extcon/extcon-sm5502.c b/drivers/extcon/extcon-sm5502.c
> index 9f40bb9f1f81..951f6ca4c479 100644
> --- a/drivers/extcon/extcon-sm5502.c
> +++ b/drivers/extcon/extcon-sm5502.c
> @@ -40,17 +40,13 @@ struct sm5502_muic_info {
>   	struct i2c_client *i2c;
>   	struct regmap *regmap;
>   
> +	const struct sm5502_type *type;
>   	struct regmap_irq_chip_data *irq_data;
> -	struct muic_irq *muic_irqs;
> -	unsigned int num_muic_irqs;
>   	int irq;
>   	bool irq_attach;
>   	bool irq_detach;
>   	struct work_struct irq_work;
>   
> -	struct reg_data *reg_data;
> -	unsigned int num_reg_data;
> -
>   	struct mutex mutex;
>   
>   	/*
> @@ -62,6 +58,17 @@ struct sm5502_muic_info {
>   	struct delayed_work wq_detcable;
>   };
>   
> +struct sm5502_type {
> +	struct muic_irq *muic_irqs;
> +	unsigned int num_muic_irqs;
> +	const struct regmap_irq_chip *irq_chip;
> +
> +	struct reg_data *reg_data;
> +	unsigned int num_reg_data;
> +
> +	int (*parse_irq)(struct sm5502_muic_info *info, int irq_type);
> +};
> +
>   /* Default value of SM5502 register to bring up MUIC device. */
>   static struct reg_data sm5502_reg_data[] = {
>   	{
> @@ -502,11 +509,11 @@ static irqreturn_t sm5502_muic_irq_handler(int irq, void *data)
>   	struct sm5502_muic_info *info = data;
>   	int i, irq_type = -1, ret;
>   
> -	for (i = 0; i < info->num_muic_irqs; i++)
> -		if (irq == info->muic_irqs[i].virq)
> -			irq_type = info->muic_irqs[i].irq;
> +	for (i = 0; i < info->type->num_muic_irqs; i++)
> +		if (irq == info->type->muic_irqs[i].virq)
> +			irq_type = info->type->muic_irqs[i].irq;
>   
> -	ret = sm5502_parse_irq(info, irq_type);
> +	ret = info->type->parse_irq(info, irq_type);

Looks good to me. But there is only one comment.
Need to check the 'parse_irq' as following:

If you agree this suggestion, I'll apply with following changes by myself:

	if (!info->type->parse_irq) {
		dev_err(info->dev, "failed to handle irq due to parse_irq\n",
		return IRQ_NONE;
	}


(snip)

-- 
Best Regards,
Samsung Electronics
Chanwoo Choi