linux-kernel - Re: [RFC PATCH v2 1/3] regmap: Add flat_cache_default_is

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Message-ID: <4ec3c16c-f1a3-4272-a639-747a5c1ec265@sirena.org.uk>
Date: Mon, 12 Jan 2026 21:45:03 +0000
From: Mark Brown <broonie@...nel.org>
To: Sander Vanheule <sander@...nheule.net>
Cc: "Sheetal ." <sheetal@...dia.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J . Wysocki" <rafael@...nel.org>,
	Danilo Krummrich <dakr@...nel.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
	Thierry Reding <thierry.reding@...il.com>,
	Jonathan Hunter <jonathanh@...dia.com>,
	Mohan kumar <mkumard@...dia.com>, linux-kernel@...r.kernel.org,
	linux-sound@...r.kernel.org, linux-tegra@...r.kernel.org
Subject: Re: [RFC PATCH v2 1/3] regmap: Add flat_cache_default_is_zero flag
 for flat cache

On Mon, Jan 12, 2026 at 08:09:33PM +0100, Sander Vanheule wrote:
> On Mon, 2026-01-12 at 09:58 +0530, Sheetal . wrote:

> > 1. Maintenance burden: Drivers must list every readable register
> >    regardless of its reset value.

> If you would extend regmap_config to accept a callback for defaults, this burden
> could be reduced to near-zero if it was a simple wrapper for the writeable_regs
> and/or readable_regs callbacks. I.e. "return 0x0 if readable or writable".

That does seem like a good idea.

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