On Mon, Nov 25, 2024 at 09:45:15AM +0100, Romain Gantois wrote: > The FPC202 dual port controller serves as a low speed signal aggregator for > common port types, notably SFP. It provides access to I2C and low-speed > GPIO signals of a downstream device through a single upstream control > interface. > > Up to two logical I2C addresses can be accessed on each of the FPC202's > ports. The port controller acts as an I2C translator (ATR). It converts > addresses of incoming and outgoing I2C transactions. One use case of this > is accessing two SFP modules at logical address 0x50 from the same upstream > I2C controller, using two different client aliases. > > Signed-off-by: Romain Gantois <romain.gantois@xxxxxxxxxxx> > --- > .../devicetree/bindings/misc/ti,fpc202.yaml | 96 ++++++++++++++++++++++ > MAINTAINERS | 6 ++ > 2 files changed, 102 insertions(+) > > diff --git a/Documentation/devicetree/bindings/misc/ti,fpc202.yaml b/Documentation/devicetree/bindings/misc/ti,fpc202.yaml > new file mode 100644 > index 0000000000000000000000000000000000000000..d0464a77cabed81301e27ac2fd4e7f943a027f2a > --- /dev/null > +++ b/Documentation/devicetree/bindings/misc/ti,fpc202.yaml > @@ -0,0 +1,96 @@ > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) > +%YAML 1.2 > +--- > +$id: http://devicetree.org/schemas/misc/ti,fpc202.yaml# > +$schema: http://devicetree.org/meta-schemas/core.yaml# > + > +title: TI FPC202 dual port controller with expanded IOs > + > +maintainers: > + - Romain Gantois <romain.gantois@xxxxxxxxxxx> > + > +allOf: > + - $ref: /schemas/i2c/i2c-atr.yaml# > + > +properties: > + compatible: > + const: ti,fpc202 > + > + reg: > + maxItems: 1 > + > + gpio-controller: true > + > + "#gpio-cells": > + const: 2 > + > + enable-gpios: > + description: > + Specifier for the GPIO connected to the EN pin. > + maxItems: 1 > + > + '#address-cells': > + const: 1 > + > + '#size-cells': > + const: 0 > + > +patternProperties: > + "^i2c@[0-1]$": > + $ref: /schemas/i2c/i2c-controller.yaml > + description: Downstream device ports 0 and 1 > + > + properties: > + reg: > + maxItems: 1 > + description: > + Downstream port ID > + > + required: > + - "#address-cells" > + - "#size-cells" > + - reg > + > + unevaluatedProperties: false > + > +required: > + - compatible > + - gpio-controller > + - "#gpio-cells" > + - reg > + - "#address-cells" > + - "#size-cells" > + - i2c@0 > + - i2c@1 btw, why are both downstream ports required?
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