linux-kernel - [RFC PATCH 0/2] regmap: Add cache_default_is

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Message-ID: <20260106140827.3771375-1-sheetal@nvidia.com>
Date: Tue, 6 Jan 2026 19:38:25 +0530
From: "Sheetal ." <sheetal@...dia.com>
To: Mark Brown <broonie@...nel.org>
CC: Sander Vanheule <sander@...nheule.net>, 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>,
	<linux-kernel@...r.kernel.org>, <linux-sound@...r.kernel.org>,
	<linux-tegra@...r.kernel.org>, Sheetal <sheetal@...dia.com>
Subject: [RFC PATCH 0/2] regmap: Add cache_default_is_zero flag for flat cache

From: Sheetal <sheetal@...dia.com>

This patch series adds a cache_default_is_zero flag for REGCACHE_FLAT that
marks cache entries as valid on first read.

For hardware with zero power-on-reset registers, this avoids the need
to add all such registers to reg_defaults (maintenance burden, code
bloat, no functional benefit) just to set the validity bits.

Sheetal (2):
  regmap: Add cache_default_is_zero flag for flat cache
  ASoC: tegra: Enable cache_default_is_zero for audio drivers

 drivers/base/regmap/internal.h      |  2 ++
 drivers/base/regmap/regcache-flat.c | 11 +++++++----
 drivers/base/regmap/regcache.c      |  1 +
 include/linux/regmap.h              |  3 +++
 sound/soc/tegra/tegra186_asrc.c     |  1 +
 sound/soc/tegra/tegra186_dspk.c     |  1 +
 sound/soc/tegra/tegra210_admaif.c   |  3 +++
 sound/soc/tegra/tegra210_adx.c      |  2 ++
 sound/soc/tegra/tegra210_ahub.c     |  3 +++
 sound/soc/tegra/tegra210_amx.c      |  3 +++
 sound/soc/tegra/tegra210_dmic.c     |  1 +
 sound/soc/tegra/tegra210_i2s.c      |  2 ++
 sound/soc/tegra/tegra210_mbdrc.c    |  1 +
 sound/soc/tegra/tegra210_mixer.c    |  1 +
 sound/soc/tegra/tegra210_mvc.c      |  1 +
 sound/soc/tegra/tegra210_ope.c      |  1 +
 sound/soc/tegra/tegra210_peq.c      |  1 +
 sound/soc/tegra/tegra210_sfc.c      |  1 +
 18 files changed, 35 insertions(+), 4 deletions(-)

-- 
2.17.1