linux-kernel - Re: [PATCH v7 2/3] gpio: mmio: add DT support for memory-mapped GPIOs

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Date:	Fri, 6 May 2016 12:50:10 +0100
From:	Mark Rutland <mark.rutland@....com>
To:	Christian Lamparter <chunkeey@...glemail.com>
Cc:	linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Álvaro Fernández Rojas <noltari@...il.com>,
	Kumar Gala <galak@...eaurora.org>,
	Alexander Shiyan <shc_work@...l.ru>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Pawel Moll <pawel.moll@....com>,
	Rob Herring <robh+dt@...nel.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Andy Shevchenko <andy.shevchenko@...il.com>
Subject: Re: [PATCH v7 2/3] gpio: mmio: add DT support for memory-mapped GPIOs

Hi,

On Fri, May 06, 2016 at 01:10:20PM +0200, Christian Lamparter wrote:
> +static int bgpio_basic_mmio_parse_dt(struct platform_device *pdev,
> +				     struct bgpio_pdata *pdata,
> +				     unsigned long *flags)
> +{
> +	struct device *dev = &pdev->dev;
> +	int err;
> +
> +	pdata->base = -1;
> +	/* If ngpio property is not specified, of_property_read_u32
> +	 * will return -EINVAL. In this case the number of GPIOs is
> +	 * automatically determined by the register width. Any
> +	 * other error of of_property_read_u32 is due bad data and
> +	 * needs to be dealt with.
> +	 */
> +	err = of_property_read_u32(dev->of_node, "ngpio", &pdata->ngpio);
> +	if (err && err != -EINVAL)
> +		return err;
> +
> +	if (of_device_is_big_endian(dev->of_node))
> +		*flags |= BGPIOF_BIG_ENDIAN_BYTE_ORDER;
> +
> +	if (of_property_read_bool(dev->of_node, "unreadable-reg-set"))
> +		*flags |= BGPIOF_UNREADABLE_REG_SET;
> +
> +	if (of_property_read_bool(dev->of_node, "unreadable-reg-dir"))
> +		*flags |= BGPIOF_UNREADABLE_REG_DIR;
> +
> +	if (of_property_read_bool(dev->of_node, "big-endian-byte-order"))
> +		*flags |= BGPIOF_BIG_ENDIAN;
> +
> +	if (of_property_read_bool(dev->of_node, "read-output-reg-set"))
> +		*flags |= BGPIOF_READ_OUTPUT_REG_SET;
> +
> +	if (of_property_read_bool(dev->of_node, "no-output"))
> +		*flags |= BGPIOF_NO_OUTPUT;
> +	return 0;
> +}

Other than no-output, none of these are in the wd,mbl-gpio binding.

Please remove them for now. We can add them as/when other users of this
binding appear and begin to need them.

Thanks,
Mark.