linux-kernel - Re: [PATCH 2/2] gpio: davinci: Remove gpio2regs function to accommodate multi instances

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Date:   Wed, 11 Jan 2017 12:04:51 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Keerthy <j-keerthy@...com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        Alexandre Courbot <gnurou@...il.com>,
        Tero Kristo <t-kristo@...com>
Subject: Re: [PATCH 2/2] gpio: davinci: Remove gpio2regs function to
 accommodate multi instances

On Wed, Jan 4, 2017 at 9:26 AM, Keerthy <j-keerthy@...com> wrote:

> gpio2regs is written making an assumption that driver supports only
> one instance of gpio controller. Removing this and adding a generic
> array so as to support multiple instances of gpio controllers.
>
> Signed-off-by: Keerthy <j-keerthy@...com>

> -               regs = gpio2regs(base);
> +               regs = gpio_base + offset_array[i];

I understand this.

> -       struct davinci_gpio_regs __iomem *g = gpio2regs(hw);
> +       struct davinci_gpio_controller *chips =
> +                               (struct davinci_gpio_controller *)d->host_data;
> +       struct davinci_gpio_regs __iomem *g = chips[hw / 32].regs;

And this, if each instans has 32 GPIOs.

> -               g = gpio2regs(0);
> +               g = chips[0].regs;

Also makes sense.

> -               g = gpio2regs(gpio);
> +               g = chips[bank / 2].regs;

But what is this? I don't understand that /2 at all. Please insert a
comment explaining it so I can figure it out. Are there two banks
per instance?

Yours,
Linus Walleij