]> git.ipfire.org Git - thirdparty/kernel/stable.git/commit
pinctrl: meson: define the pull up/down resistor value as 60 kOhm
authorMartin Blumenstingl <martin.blumenstingl@googlemail.com>
Sat, 29 Mar 2025 19:01:32 +0000 (20:01 +0100)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 4 Jun 2025 12:38:04 +0000 (14:38 +0200)
commit2568cf939a6401afa44ea5827973de98737f035d
treef6284f0f52fa4e416b7cb4ee452bbc7e051cf7a6
parent64ca70dee2cccf2f9c7382b366fd05bc818856f0
pinctrl: meson: define the pull up/down resistor value as 60 kOhm

[ Upstream commit e56088a13708757da68ad035269d69b93ac8c389 ]

The public datasheets of the following Amlogic SoCs describe a typical
resistor value for the built-in pull up/down resistor:
- Meson8/8b/8m2: not documented
- GXBB (S905): 60 kOhm
- GXL (S905X): 60 kOhm
- GXM (S912): 60 kOhm
- G12B (S922X): 60 kOhm
- SM1 (S905D3): 60 kOhm

The public G12B and SM1 datasheets additionally state min and max
values:
- min value: 50 kOhm for both, pull-up and pull-down
- max value for the pull-up: 70 kOhm
- max value for the pull-down: 130 kOhm

Use 60 kOhm in the pinctrl-meson driver as well so it's shown in the
debugfs output. It may not be accurate for Meson8/8b/8m2 but in reality
60 kOhm is closer to the actual value than 1 Ohm.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/20250329190132.855196-1-martin.blumenstingl@googlemail.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
drivers/pinctrl/meson/pinctrl-meson.c