linux-kernel - Re: [PATCH 08/10] gpio: Add gpio driver for Actions OWL S900 SoC

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Date:   Sun, 18 Feb 2018 16:45:09 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Andreas Färber <afaerber@...e.de>,
        刘炜 <liuwei@...ions-semi.com>,
        mp-cs@...ions-semi.com, 96boards@...obotics.com,
        devicetree <devicetree@...r.kernel.org>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        amit.kucheria@...aro.org,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 08/10] gpio: Add gpio driver for Actions OWL S900 SoC

On Sat, Feb 17, 2018 at 10:44 PM, Manivannan Sadhasivam
<manivannan.sadhasivam@...aro.org> wrote:
> Add gpio driver for Actions Semi OWL family S900 SoC. Set of registers
> controlling the gpio shares the same register range with pinctrl block.
>
> GPIO registers are organized as 6 banks and each bank controls the
> maximum of 32 gpios.

> +#include <linux/init.h>

> +#include <linux/module.h>

Choose one of them.

> +       val = readl(gpio_base + GPIO_OUTEN);
> +       val |= BIT(offset);
> +       writel(val, gpio_base + GPIO_OUTEN);

out_en()

> +       val = readl(gpio_base + GPIO_OUTEN);
> +       val &= ~BIT(offset);
> +       writel(val, gpio_base + GPIO_OUTEN);

out_dis()

> +       val = readl(gpio_base + GPIO_INEN);
> +       val &= ~BIT(offset);
> +       writel(val, gpio_base + GPIO_INEN);

in_dis()

> +       val = readl(gpio_base + GPIO_OUTEN);
> +       val &= ~BIT(offset);
> +       writel(val, gpio_base + GPIO_OUTEN);

out_dis()

> +       val = readl(gpio_base + GPIO_INEN);
> +       val |= BIT(offset);
> +       writel(val, gpio_base + GPIO_INEN);

in_en()


> +       val = readl(gpio_base + GPIO_INEN);
> +       val &= ~BIT(pin);
> +       writel(val, gpio_base + GPIO_INEN);

in_dis()

> +       val = readl(gpio_base + GPIO_OUTEN);
> +       val |= BIT(pin);
> +       writel(val, gpio_base + GPIO_OUTEN);

out_en()

Find above code duplication.

> +static int owl_gpio_probe(struct platform_device *pdev)
> +{

> +       gpio->base = of_iomap(pdev->dev.of_node, 0);
> +       if (IS_ERR(gpio->base))
> +               return PTR_ERR(gpio->base);


> +       gpio->gpio.of_node = pdev->dev.of_node;

Isn't this done by GPIO library?

> +static int owl_gpio_remove(struct platform_device *pdev)
> +{
> +       return 0;
> +}

Useless stub.

-- 
With Best Regards,
Andy Shevchenko