linux-kernel - Re: [PATCH v2 2/2] arm64: dts: rockchip: Add FriendlyElec CM3588 NAS board

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Date: Sat, 8 Jun 2024 21:01:23 +0200
From: me@...-space.agency
To: Sebastian Kropatsch <seb-dev@...l.de>, Heiko Stuebner <heiko@...ech.de>,
 linux-rockchip@...ts.infradead.org,
 Sebastian Reichel <sebastian.reichel@...labora.com>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Jonas Karlman <jonas@...boo.se>,
 Dragan Simic <dsimic@...jaro.org>, devicetree@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] arm64: dts: rockchip: Add FriendlyElec CM3588 NAS
 board

Hey Sebastian,

On 08.06.2024 19:22, Sebastian Kropatsch wrote:
> But matching the schematics won't be possible either way, since
> e.g. there is only one single 5v regulator acc. to the schematic
> (vcc_5v0_sys), but vcc_5v0_host_20, vcc_5v0_host_30, vbus_5v0_typec
> and so on are needed since each device has a different control pin
> to enable its power. Or is there a better way to solve this while
> having only one 5v regulator node but still being able to set the
> control pins separately for the different USB ports?
> 
> Cheers,
> Sebastian
> 
> [1] 
> https://wiki.friendlyelec.com/wiki/images/1/15/CM3588_NAS_SDK_2309_SCH.PDF


There are these SY6280AAC power switches, which have enable pins and 
unique power net names coming out of them. I think it would be best to 
treat those as regulators. i.e.:
- Page 4 C4 has GPIO1_D2 as enable, outputting VBUS5V0_TYPEC
- Page 17 D4 has GPIO4_B0 as enable, outputting USB3_PORT1_5V
- Page 17 C4 has GPIO3_A5 as enable, outputting USB3_PORT2_5V
- Page 17 B4 has GPIO1_A4 as enable, outputting USB2_PORT_5V

Each can just be seen as a regulator outputting either 0V or 5V.

Kind regards,
Space