linux-kernel - Re: [PATCH] gpio: dwapb: Add support for next generation of X-Gene SoC

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Date:   Thu, 2 Feb 2017 17:18:30 -0800
From:   Hoan Tran <hotran@....com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Alexandre Courbot <gnurou@...il.com>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Loc Ho <lho@....com>, Duc Dang <dhdang@....com>
Subject: Re: [PATCH] gpio: dwapb: Add support for next generation of X-Gene SoC

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Hi Andy,

On Thu, Feb 2, 2017 at 11:47 AM, Andy Shevchenko
<andy.shevchenko@...il.com> wrote:
> On Tue, Jan 31, 2017 at 9:43 PM, Hoan Tran <hotran@....com> wrote:
>> Next generation of X-Gene SoC's GPIO hardware register map is very
>> similar to DW GPIO. It only differs by a few register addresses.
>> This patch modifies DW GPIO driver to accommodate the difference
>> in a few register addresses.
>
>> +#define GPIO_REG_OFFSET_V2     1
>> +#define GPIO_INTMASK_V2                0x44
>> +#define GPIO_INTTYPE_LEVEL_V2  0x34
>> +#define GPIO_INT_POLARITY_V2   0x38
>> +#define GPIO_INTSTATUS_V2      0x3c
>> +#define GPIO_PORTA_EOI_V2      0x40
>> +
>
>>  static inline u32 dwapb_read(struct dwapb_gpio *gpio, unsigned int offset)
>>  {
>>         struct gpio_chip *gc    = &gpio->ports[0].gc;
>>         void __iomem *reg_base  = gpio->regs;
>>
>> -       return gc->read_reg(reg_base + offset);
>> +       return gc->read_reg(reg_base + gpio_reg_convert(gpio, offset));
>
> And what prevents us to introduce special read_reg for that registers?

How could we introduce a special read_reg here? If so, we also have to
have another special write_reg.

> Also what about to convert to regmap API?

Could you guide more how to use regmap in this case? The
gpio_reg_convert() is also used to send the GPIO_PORTA_EOI and
GPIO_INTMASK register offsets to irq_chip.

Thanks
Hoan

>
> --
> With Best Regards,
> Andy Shevchenko