On 06.08.2024 10:50:20, Rob Herring wrote: > On Wed, Jul 31, 2024 at 11:37:03AM +0200, Marc Kleine-Budde wrote: > > Add documentation for the rockchip rk3568 CAN-FD controller. > > > > Co-developed-by: Elaine Zhang <zhangqing@xxxxxxxxxxxxxx> > > Signed-off-by: Elaine Zhang <zhangqing@xxxxxxxxxxxxxx> > > Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx> > > --- > > .../bindings/net/can/rockchip,canfd.yaml | 76 ++++++++++++++++++++++ > > rockchip,rk3568-canfd.yaml Thanks, will rename. > > MAINTAINERS | 7 ++ > > 2 files changed, 83 insertions(+) > > > > diff --git a/Documentation/devicetree/bindings/net/can/rockchip,canfd.yaml b/Documentation/devicetree/bindings/net/can/rockchip,canfd.yaml > > new file mode 100644 > > index 000000000000..444269f630f4 > > --- /dev/null > > +++ b/Documentation/devicetree/bindings/net/can/rockchip,canfd.yaml > > @@ -0,0 +1,76 @@ > > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) > > +%YAML 1.2 > > +--- > > +$id: http://devicetree.org/schemas/net/can/rockchip,canfd.yaml# > > +$schema: http://devicetree.org/meta-schemas/core.yaml# > > + > > +title: > > + Rockchip CAN-FD controller > > + > > +maintainers: > > + - Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx> > > + > > +allOf: > > + - $ref: can-controller.yaml# > > + > > +properties: > > + compatible: > > + oneOf: > > + - const: rockchip,rk3568-canfd > > + - items: > > + - enum: > > + - rockchip,rk3568v2-canfd > > + - rockchip,rk3568v3-canfd > > + - const: rockchip,rk3568-canfd > > Given you already know there are differences in the versions to handle > and there's no existing driver supporting the fallback, I don't know > that a fallback is too useful here. Let me re-think out loud about the compatibilities: There is a CAN-FD IP core in the rockchip,rk3568 SoC. In the silicon revision v2 of the SoC it has 12 documented errata und silicon revision v3 some of them are fixed. This means the driver can skip some of the workarounds. The v3 revision works with all the errata of the v2 active, currently with a probably not measurable increase of CPU load. This might change in the future, if more v2 workarounds are added. These might degrade performance. So it's for the v2 silicon revision: compatible = "rockchip,rk3568v2-canfd"; And for the v3 silicon revision: compatible = "rockchip,rk3568v3-canfd", "rockchip,rk3568v2-canfd"; Which is documented in the yaml as: properties: compatible: oneOf: - const: rockchip,rk3568v2-canfd - items: - const: rockchip,rk3568v3-canfd - const: rockchip,rk3568v2-canfd regards, Marc -- Pengutronix e.K. | Marc Kleine-Budde | Embedded Linux | https://www.pengutronix.de | Vertretung Nürnberg | Phone: +49-5121-206917-129 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-9 |
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