On Fri, Jul 23, 2021 at 03:52:39PM +0200, Clément Léger wrote: > This patch adds documentation for the "syscon-smc" compatible which describes > a syscon using a SMC regmap instead of a MMIO one. This allows accessing system > controllers that are set as secure by using SMC handled by the secure monitor. > > Signed-off-by: Clément Léger <clement.leger@xxxxxxxxxxx> > --- > .../devicetree/bindings/mfd/syscon-smc.yaml | 57 +++++++++++++++++++ > 1 file changed, 57 insertions(+) > create mode 100644 Documentation/devicetree/bindings/mfd/syscon-smc.yaml > > diff --git a/Documentation/devicetree/bindings/mfd/syscon-smc.yaml b/Documentation/devicetree/bindings/mfd/syscon-smc.yaml > new file mode 100644 > index 000000000000..6ce1392c5e7f > --- /dev/null > +++ b/Documentation/devicetree/bindings/mfd/syscon-smc.yaml > @@ -0,0 +1,57 @@ > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) > +%YAML 1.2 > +--- > +$id: http://devicetree.org/schemas/mfd/syscon-smc.yaml# > +$schema: http://devicetree.org/meta-schemas/core.yaml# > + > +title: System Controller Registers R/W via SMC Device Tree Bindings > + > +description: | > + System controller SMC node represents a register region containing a set > + of miscellaneous registers accessed through a secure monitor. > + The typical use-case is the same as the syscon one but when running with a > + secure monitor. > + > +maintainers: > + - Lee Jones <lee.jones@xxxxxxxxxx> > + > +properties: > + compatible: > + anyOf: > + - items: > + - enum: > + - atmel,sama5d2-sfr > + > + - const: syscon-smc I regret having 'syscon' as a compatible, so nak on a 2nd flavor of it. It's only purpose is a hint to Linux to automagically create a regmap for you. All you need is the specific compatible, atmel,sama5d2-sfr, and you can imply the rest of this from it. That's assuming the conclusion is a register read/write interface on SMC is a good idea, but I don't think it is. Rob
