linux-kernel - Re: [PATCH 2/2] regmap: sdw: Remove 8-bit value size restriction

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Message-ID: <Y8GQs6svuei0SnX6@sirena.org.uk>
Date:   Fri, 13 Jan 2023 17:11:15 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Cc:     Charles Keepax <ckeepax@...nsource.cirrus.com>, vkoul@...nel.org,
        yung-chuan.liao@...ux.intel.com, sanyog.r.kale@...el.com,
        linux-kernel@...r.kernel.org, patches@...nsource.cirrus.com
Subject: Re: [PATCH 2/2] regmap: sdw: Remove 8-bit value size restriction

On Fri, Jan 13, 2023 at 10:57:39AM -0600, Pierre-Louis Bossart wrote:

> The change from reg_write/read_reg to write/read seems ok, what I was
> asking about was the gather_write.

> +	.write = regmap_sdw_write,
> +	.gather_write = regmap_sdw_gather_write,
> +	.read = regmap_sdw_read,

> what happens if you only have .write and .read? What does the
> .gather_write help with if you only use only address?

Like I said before it means that the core doesn't have to put the
register in a linear buffer with the values, meaning it can avoid
copying already formatted data around or allocating memory.

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