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net: dsa: realtek: rtl83xx: add support for enabling supplies

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The power supplies powering the IC may not necessarily be enabled by the
time the driver probes.  The binding describes the power rails, so enable
them at probe with devm_regulator_bulk_get_enable(), before the reset line
is requested and driven, so the chip is powered before its pins are driven.

Boards that do not describe these supplies fall back to dummy regulators
(with a "supply not found" warning) and keep working as before.

A board that describes supplies but no reset line still needs to wait for
the chip to boot before the first register access, so apply the existing
start delay in that case too.

Signed-off-by: Alvin Šipraga <alsi@bang-olufsen.dk>
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Co-developed-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: Linus Walleij <linusw@kernel.org>
Reviewed-by: Luiz Angelo Daros de Luca <luizluca@gmail.com>
Link: https://patch.msgid.link/20260831123637.666457-3-o.rempel@pengutronix.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Ahmad Fatoum 2026-08-31 14:36:36 +02:00 • committed by Jakub Kicinski
commit f823644996
3 changed files with 25 additions and 1 deletions
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