linux-kernel - [RFC PATCH v3 0/4] regmap: reg_default

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Message-ID: <20260123095346.1258556-1-sheetal@nvidia.com>
Date: Fri, 23 Jan 2026 15:23:42 +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>,
	Mohan kumar <mkumard@...dia.com>, <linux-kernel@...r.kernel.org>,
	<linux-sound@...r.kernel.org>, <linux-tegra@...r.kernel.org>, sheetal
	<sheetal@...dia.com>
Subject: [RFC PATCH v3 0/4] regmap: reg_default_cb for flat cache defaults

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

This series adds a reg_default_cb callback for REGCACHE_FLAT to provide
defaults for registers not listed in reg_defaults. Defaults are loaded
eagerly during regcache init and the callback can use writeable_reg to
filter valid addresses and avoid holes.

Tegra ASoC drivers set reg_default_cb and add writeable_reg filtering for
AHUB RX holes to prevent invalid addresses from being marked valid.

Changes in v3:
- Add AHUB writeable_reg filtering for RX holes.
- Replace flat_cache_default_is_zero flag with reg_default_cb callback
- Load defaults at regcache init using reg_default_cb
- Set reg_default_cb in Tegra ASoC drivers
- Add KUnit coverage for reg_default_cb callback

Note:
 "ASoC: tegra: set reg_default_cb callback" patch depends on
 "ASoC: tegra: Add AHUB writeable_reg for RX holes" patch,
 hence included in this series.

Sheetal (4):
  ASoC: tegra: Add AHUB writeable_reg for RX holes
  regmap: Add reg_default_cb callback for flat cache defaults
  ASoC: tegra: set reg_default_cb callback
  regmap: add KUnit coverage for reg_default_cb callback

 drivers/base/regmap/internal.h      |  3 +
 drivers/base/regmap/regcache-flat.c | 19 ++++++
 drivers/base/regmap/regcache.c      |  3 +-
 drivers/base/regmap/regmap-kunit.c  | 91 +++++++++++++++++++++++++++++
 drivers/base/regmap/regmap.c        |  2 +
 include/linux/regmap.h              | 14 +++++
 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     | 60 +++++++++++++++++++
 sound/soc/tegra/tegra210_ahub.h     | 30 ++++++++++
 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 +
 21 files changed, 240 insertions(+), 1 deletion(-)

-- 
2.34.1