[PATCH 00/21] treewide: remove unneeded 'fast_io' parameter in regmap_config

[PATCH 00/21] treewide: remove unneeded 'fast_io' parameter in regmap_config

[Wolfram Sang]

While working on a driver using regmap with MMIO, I wondered if I need
to set 'fast_io' in the config. Turned out I don't need to, so I added
documentation for it with commit ffc72771ff6e ("regmap: Annotate that
MMIO implies fast IO").

This series fixes the existing users in the tree which needlessly set
the flag. They have been found using this coccinelle script:

===

@ match @
expression dev, clk, regs;
identifier config;
@@

(
	regmap_init_mmio(dev, regs, &config)
|
	devm_regmap_init_mmio(dev, regs, &config)
|
	regmap_init_mmio_clk(dev, clk, regs, &config)
|
	devm_regmap_init_mmio_clk(dev, clk, regs, &config)
)

@ fix depends on match @
identifier match.config;
@@

	struct regmap_config config = {
-	.fast_io = true,
	};

===

It misses occasions where 'config' is an expression and not an
identifier. These are rare, though, I can fix them manually later. The
advantage of this approach is that it produces no false positives to the
best of my knowledge.

Please apply individually per subsystem. There are no dependencies and
buildbot is happy. Patches are based on 6.17-rc1

Happy hacking,

   Wolfram


Wolfram Sang (21):
  bus: remove unneeded 'fast_io' parameter in regmap_config
  clk: remove unneeded 'fast_io' parameter in regmap_config
  gpio: remove unneeded 'fast_io' parameter in regmap_config
  drm: remove unneeded 'fast_io' parameter in regmap_config
  iio: remove unneeded 'fast_io' parameter in regmap_config
  Input: remove unneeded 'fast_io' parameter in regmap_config
  mailbox: remove unneeded 'fast_io' parameter in regmap_config
  media: remove unneeded 'fast_io' parameter in regmap_config
  mfd: remove unneeded 'fast_io' parameter in regmap_config
  mmc: remove unneeded 'fast_io' parameter in regmap_config
  peci: remove unneeded 'fast_io' parameter in regmap_config
  phy: remove unneeded 'fast_io' parameter in regmap_config
  pinctrl: remove unneeded 'fast_io' parameter in regmap_config
  pmdomain: remove unneeded 'fast_io' parameter in regmap_config
  regulator: remove unneeded 'fast_io' parameter in regmap_config
  reset: remove unneeded 'fast_io' parameter in regmap_config
  rtc: remove unneeded 'fast_io' parameter in regmap_config
  soc: remove unneeded 'fast_io' parameter in regmap_config
  spi: remove unneeded 'fast_io' parameter in regmap_config
  thermal: remove unneeded 'fast_io' parameter in regmap_config
  ASoC: remove unneeded 'fast_io' parameter in regmap_config

 drivers/bus/bt1-apb.c                             | 1 -
 drivers/clk/actions/owl-common.c                  | 1 -
 drivers/clk/clk-axm5516.c                         | 1 -
 drivers/clk/nxp/clk-lpc32xx.c                     | 1 -
 drivers/clk/qcom/a53-pll.c                        | 1 -
 drivers/clk/qcom/a7-pll.c                         | 1 -
 drivers/clk/qcom/apss-ipq-pll.c                   | 1 -
 drivers/clk/qcom/clk-cbf-8996.c                   | 1 -
 drivers/clk/qcom/clk-cpu-8996.c                   | 1 -
 drivers/clk/qcom/hfpll.c                          | 1 -
 drivers/clk/qcom/ipq-cmn-pll.c                    | 1 -
 drivers/clk/thead/clk-th1520-ap.c                 | 1 -
 drivers/gpio/gpio-mvebu.c                         | 1 -
 drivers/gpio/gpio-sifive.c                        | 1 -
 drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi2.c    | 1 -
 drivers/gpu/drm/imx/dc/dc-cf.c                    | 1 -
 drivers/gpu/drm/imx/dc/dc-de.c                    | 1 -
 drivers/gpu/drm/imx/dc/dc-ed.c                    | 2 --
 drivers/gpu/drm/imx/dc/dc-fg.c                    | 1 -
 drivers/gpu/drm/imx/dc/dc-fl.c                    | 1 -
 drivers/gpu/drm/imx/dc/dc-fw.c                    | 2 --
 drivers/gpu/drm/imx/dc/dc-ic.c                    | 1 -
 drivers/gpu/drm/imx/dc/dc-lb.c                    | 2 --
 drivers/gpu/drm/imx/dc/dc-tc.c                    | 1 -
 drivers/gpu/drm/imx/ipuv3/imx-tve.c               | 2 --
 drivers/gpu/drm/rockchip/dw-mipi-dsi2-rockchip.c  | 1 -
 drivers/iio/adc/sun4i-gpadc-iio.c                 | 1 -
 drivers/input/touchscreen/fsl-imx25-tcq.c         | 1 -
 drivers/mailbox/qcom-apcs-ipc-mailbox.c           | 1 -
 drivers/media/cec/platform/stm32/stm32-cec.c      | 1 -
 drivers/mfd/exynos-lpass.c                        | 1 -
 drivers/mfd/fsl-imx25-tsadc.c                     | 1 -
 drivers/mfd/stm32-lptimer.c                       | 1 -
 drivers/mfd/sun4i-gpadc.c                         | 1 -
 drivers/mmc/host/sdhci_am654.c                    | 1 -
 drivers/peci/controller/peci-npcm.c               | 1 -
 drivers/phy/rockchip/phy-rockchip-samsung-hdptx.c | 1 -
 drivers/phy/rockchip/phy-rockchip-usbdp.c         | 1 -
 drivers/phy/ti/phy-am654-serdes.c                 | 1 -
 drivers/phy/ti/phy-j721e-wiz.c                    | 1 -
 drivers/pinctrl/pinctrl-rp1.c                     | 1 -
 drivers/pmdomain/imx/gpc.c                        | 1 -
 drivers/regulator/qcom-refgen-regulator.c         | 1 -
 drivers/reset/reset-intel-gw.c                    | 1 -
 drivers/reset/reset-qcom-pdc.c                    | 1 -
 drivers/reset/reset-th1520.c                      | 1 -
 drivers/rtc/rtc-meson.c                           | 1 -
 drivers/soc/qcom/llcc-qcom.c                      | 1 -
 drivers/soc/qcom/ramp_controller.c                | 1 -
 drivers/spi/spi-altera-platform.c                 | 1 -
 drivers/thermal/armada_thermal.c                  | 1 -
 drivers/thermal/sun8i_thermal.c                   | 1 -
 sound/soc/fsl/fsl_sai.c                           | 1 -
 53 files changed, 57 deletions(-)

-- 
2.47.2

[PATCH 03/21] gpio: remove unneeded 'fast_io' parameter in regmap_config

[Wolfram Sang]

When using MMIO with regmap, fast_io is implied. No need to set it
again.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
---
No dependencies, can be applied directly to the subsystem tree. Buildbot is
happy, too.

 drivers/gpio/gpio-mvebu.c  | 1 -
 drivers/gpio/gpio-sifive.c | 1 -
 2 files changed, 2 deletions(-)

diff --git a/drivers/gpio/gpio-mvebu.c b/drivers/gpio/gpio-mvebu.c
index 5e3f54cb8bc4..261ffd0c614b 100644
--- a/drivers/gpio/gpio-mvebu.c
+++ b/drivers/gpio/gpio-mvebu.c
@@ -602,7 +602,6 @@ static const struct regmap_config mvebu_gpio_regmap_config = {
 	.reg_bits = 32,
 	.reg_stride = 4,
 	.val_bits = 32,
-	.fast_io = true,
 };
 
 /*
diff --git a/drivers/gpio/gpio-sifive.c b/drivers/gpio/gpio-sifive.c
index 067c8edb62e2..98ef975c44d9 100644
--- a/drivers/gpio/gpio-sifive.c
+++ b/drivers/gpio/gpio-sifive.c
@@ -174,7 +174,6 @@ static const struct regmap_config sifive_gpio_regmap_config = {
 	.reg_bits = 32,
 	.reg_stride = 4,
 	.val_bits = 32,
-	.fast_io = true,
 	.disable_locking = true,
 };
 
-- 
2.47.2

Re: [PATCH 03/21] gpio: remove unneeded 'fast_io' parameter in regmap_config

[Bartosz Golaszewski]

On Wed, Aug 13, 2025 at 6:16 PM Wolfram Sang
<wsa+renesas@sang-engineering.com> wrote:
>
> When using MMIO with regmap, fast_io is implied. No need to set it
> again.
>
> Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
> ---
> No dependencies, can be applied directly to the subsystem tree. Buildbot is
> happy, too.

Applied. b4 generates a super long list of recipients even if I only
apply this one patch and I can't send the automatic reply due to
gmail's limits. :(

Bart

Re: (subset) [PATCH 00/21] treewide: remove unneeded 'fast_io' parameter in regmap_config

[Mark Brown]

On Wed, 13 Aug 2025 18:14:46 +0200, Wolfram Sang wrote:
> While working on a driver using regmap with MMIO, I wondered if I need
> to set 'fast_io' in the config. Turned out I don't need to, so I added
> documentation for it with commit ffc72771ff6e ("regmap: Annotate that
> MMIO implies fast IO").
> 
> This series fixes the existing users in the tree which needlessly set
> the flag. They have been found using this coccinelle script:
> 
> [...]

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator.git for-next

Thanks!

[15/21] regulator: remove unneeded 'fast_io' parameter in regmap_config
        commit: 37533933bfe92cd5a99ef4743f31dac62ccc8de0

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

Re: (subset) [PATCH 00/21] treewide: remove unneeded 'fast_io' parameter in regmap_config

[Mark Brown]

On Wed, 13 Aug 2025 18:14:46 +0200, Wolfram Sang wrote:
> While working on a driver using regmap with MMIO, I wondered if I need
> to set 'fast_io' in the config. Turned out I don't need to, so I added
> documentation for it with commit ffc72771ff6e ("regmap: Annotate that
> MMIO implies fast IO").
> 
> This series fixes the existing users in the tree which needlessly set
> the flag. They have been found using this coccinelle script:
> 
> [...]

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git for-next

Thanks!

[19/21] spi: remove unneeded 'fast_io' parameter in regmap_config
        commit: 48124569bbc6bfda1df3e9ee17b19d559f4b1aa3

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

Re: (subset) [PATCH 00/21] treewide: remove unneeded 'fast_io' parameter in regmap_config

[Mark Brown]

On Wed, 13 Aug 2025 18:14:46 +0200, Wolfram Sang wrote:
> While working on a driver using regmap with MMIO, I wondered if I need
> to set 'fast_io' in the config. Turned out I don't need to, so I added
> documentation for it with commit ffc72771ff6e ("regmap: Annotate that
> MMIO implies fast IO").
> 
> This series fixes the existing users in the tree which needlessly set
> the flag. They have been found using this coccinelle script:
> 
> [...]

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next

Thanks!

[21/21] ASoC: remove unneeded 'fast_io' parameter in regmap_config
        commit: d578faf7096affc036fd16333f1bfbe4991a22f7

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

Re: (subset) [PATCH 00/21] treewide: remove unneeded 'fast_io' parameter in regmap_config

[Bjorn Andersson]

On Wed, 13 Aug 2025 18:14:46 +0200, Wolfram Sang wrote:
> While working on a driver using regmap with MMIO, I wondered if I need
> to set 'fast_io' in the config. Turned out I don't need to, so I added
> documentation for it with commit ffc72771ff6e ("regmap: Annotate that
> MMIO implies fast IO").
> 
> This series fixes the existing users in the tree which needlessly set
> the flag. They have been found using this coccinelle script:
> 
> [...]

Applied, thanks!

[18/21] soc: remove unneeded 'fast_io' parameter in regmap_config
        commit: 5d8a9c8401648d338d072a488d455ed4611c5d4b

Best regards,
-- 
Bjorn Andersson <andersson@kernel.org>

Re: (subset) [PATCH 00/21] treewide: remove unneeded 'fast_io' parameter in regmap_config

[Vinod Koul]

On Wed, 13 Aug 2025 18:14:46 +0200, Wolfram Sang wrote:
> While working on a driver using regmap with MMIO, I wondered if I need
> to set 'fast_io' in the config. Turned out I don't need to, so I added
> documentation for it with commit ffc72771ff6e ("regmap: Annotate that
> MMIO implies fast IO").
> 
> This series fixes the existing users in the tree which needlessly set
> the flag. They have been found using this coccinelle script:
> 
> [...]

Applied, thanks!

[12/21] phy: remove unneeded 'fast_io' parameter in regmap_config
        commit: e1e1e77f7df7cbee959ba024e5475907fe561c98

Best regards,
-- 
~Vinod