linux-kernel - Re: [PATCH v2 2/2] gpio: Add GPIO driver for Spreadtrum SC9860 platform

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Date:   Thu, 1 Feb 2018 17:31:54 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Baolin Wang <baolin.wang@...aro.org>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Mark Brown <broonie@...nel.org>
Subject: Re: [PATCH v2 2/2] gpio: Add GPIO driver for Spreadtrum SC9860 platform

On Thu, Feb 1, 2018 at 5:04 AM, Baolin Wang <baolin.wang@...aro.org> wrote:
> The Spreadtrum SC9860 platform GPIO controller contains 16 groups and
> each group contains 16 GPIOs. Each GPIO can set input/output and has
> the interrupt capability.

Just noticed couple of more improvements you can do.

> +       case IRQ_TYPE_EDGE_RISING:
> +               sprd_gpio_update(chip, offset, SPRD_GPIO_IS, 0);
> +               sprd_gpio_update(chip, offset, SPRD_GPIO_IBE, 0);
> +               sprd_gpio_update(chip, offset, SPRD_GPIO_IEV, 1);
> +               irq_set_handler_locked(data, handle_edge_irq);
> +               break;
> +       case IRQ_TYPE_EDGE_FALLING:
> +               sprd_gpio_update(chip, offset, SPRD_GPIO_IS, 0);
> +               sprd_gpio_update(chip, offset, SPRD_GPIO_IBE, 0);
> +               sprd_gpio_update(chip, offset, SPRD_GPIO_IEV, 0);
> +               irq_set_handler_locked(data, handle_edge_irq);
> +               break;
> +       case IRQ_TYPE_EDGE_BOTH:
> +               sprd_gpio_update(chip, offset, SPRD_GPIO_IS, 0);
> +               sprd_gpio_update(chip, offset, SPRD_GPIO_IBE, 1);
> +               irq_set_handler_locked(data, handle_edge_irq);
> +               break;
> +       case IRQ_TYPE_LEVEL_HIGH:
> +               sprd_gpio_update(chip, offset, SPRD_GPIO_IS, 1);
> +               sprd_gpio_update(chip, offset, SPRD_GPIO_IBE, 0);
> +               sprd_gpio_update(chip, offset, SPRD_GPIO_IEV, 1);
> +               irq_set_handler_locked(data, handle_level_irq);
> +               break;
> +       case IRQ_TYPE_LEVEL_LOW:
> +               sprd_gpio_update(chip, offset, SPRD_GPIO_IS, 1);
> +               sprd_gpio_update(chip, offset, SPRD_GPIO_IBE, 0);
> +               sprd_gpio_update(chip, offset, SPRD_GPIO_IEV, 0);
> +               irq_set_handler_locked(data, handle_level_irq);
> +               break;
> +       default:
> +               return -EINVAL;

I guess you can use fallthrough and reduce some lines, but I have no
strong opinion which will look better.

> +       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +       sprd_gpio->base = devm_ioremap_nocache(&pdev->dev, res->start,
> +                                              resource_size(res));

Didn't notice before, why not to simple call devm_ioremap_resource() ?

-- 
With Best Regards,
Andy Shevchenko