linux-kernel - Re: [PATCH v2 12/18] gpio: madera: Support Cirrus Logic Madera class codecs

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Date:   Tue, 25 Apr 2017 16:13:57 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Richard Fitzgerald <rf@...nsource.wolfsonmicro.com>
Cc:     Lee Jones <lee.jones@...aro.org>, Mark Brown <broonie@...nel.org>,
        Alexandre Courbot <gnurou@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        "open list:WOLFSON MICROELECTRONICS DRIVERS" 
        <patches@...nsource.wolfsonmicro.com>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 12/18] gpio: madera: Support Cirrus Logic Madera class codecs

On Mon, Apr 24, 2017 at 6:08 PM, Richard Fitzgerald
<rf@...nsource.wolfsonmicro.com> wrote:

> This adds support for the GPIOs on Cirrus Logic Madera class codecs.
> Any pins not used for special functions (see the pinctrl driver) can be
> used as general single-bit input or output lines. The number of available
> GPIOs varies between codecs.
>
> Signed-off-by: Nariman Poushin <nariman@...nsource.wolfsonmicro.com>
> Signed-off-by: Richard Fitzgerald <rf@...nsource.wolfsonmicro.com>
> Signed-off-by: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
> ---
> Changes from V1:
> - dt bindings moved to a separate patch
> - dependent on pinctrl driver instead of parent MFD
> - added get_direction function
> - added .request / .free / .set_config to work with pinctrl driver
> - register range with pinctrl driver

Nice, but...

> +       ret = gpiochip_add_pin_range(&madera_gpio->gpio_chip, "madera-pinctrl",
> +                                    0, 0, madera_gpio->gpio_chip.ngpio);
> +       if (ret) {
> +               dev_warn(&pdev->dev, "Failed to add pin range (%d)\n", ret);
> +               return ret;
> +       }

This is all fine, but we have generic code for adding ranges from
the device tree, see
Documentation/devicetree/bindings/gpio/gpio.txt

With that this range should not even be needed.
Apart from that it looks pretty solid.

Yours,
Linus Walleij