linux-kernel - Re: [PATCH v2 1/5] spi: spi-mem: Add driver for NXP FlexSPI controller

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Message-ID: <20180917133751.453ea6ed@bbrezillon>
Date:   Mon, 17 Sep 2018 13:37:51 +0200
From:   Boris Brezillon <boris.brezillon@...tlin.com>
To:     Yogesh Gaur <yogeshnarayan.gaur@....com>
Cc:     linux-mtd@...ts.infradead.org, marek.vasut@...il.com,
        linux-spi@...r.kernel.org, devicetree@...r.kernel.org,
        robh@...nel.org, mark.rutland@....com, shawnguo@...nel.org,
        linux-arm-kernel@...ts.infradead.org, computersforpeace@...il.com,
        frieder.schrempf@...eet.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/5] spi: spi-mem: Add driver for NXP FlexSPI
 controller

Hi Yogesh,

On Mon, 17 Sep 2018 15:18:26 +0530
Yogesh Gaur <yogeshnarayan.gaur@....com> wrote:

> +
> +	/*
> +	 * R/W functions for big- or little-endian registers:
> +	 * The FSPI controller's endianness is independent of
> +	 * the CPU core's endianness. So far, although the CPU
> +	 * core is little-endian the FSPI controller can use
> +	 * big-endian or little-endian.
> +	 */
> +	if (of_property_read_bool(np, "big-endian")) {
> +		f->write = fspi_writel_be;
> +		f->read = fspi_readl_be;
> +	} else {
> +		f->write = fspi_writel;
> +		f->read = fspi_readl;
> +	}

Hm, isn't it something you can extract from the compatible string? I'd
rather not allow users to set that in their DT if it's not something
you can change.

Regards,

Boris