On Wed, Sep 13, 2023 at 6:17 AM Hari Nagalla <hnagalla@xxxxxx> wrote: > > K3 AM64x SoC has a Cortex M4F subsystem in the MCU voltage domain. > The remote processor's life cycle management and IPC mechanisms are > similar across the R5F and M4F cores from remote processor driver > point of view. However, there are subtle differences in image loading > and starting the M4F subsystems. > > The YAML binding document provides the various node properties to be > configured by the consumers of the M4F subsystem. > > Signed-off-by: Martyn Welch <martyn.welch@xxxxxxxxxxxxx> > Signed-off-by: Hari Nagalla <hnagalla@xxxxxx> > --- > Changes since v1: > - Spelling corrections > - Corrected to pass DT checks > > Changes since v2: > - Missed spelling correction to commit message > > Changes since v3: > - Removed unnecessary descriptions and used generic memory region names > - Made mboxes and memory-region optional > - Removed unrelated items from examples > > Changes since v4: > - Rebased to the latest kernel-next tree > - Added optional sram memory region for m4f device node > > Changes since v5: > - None > > .../bindings/remoteproc/ti,k3-m4f-rproc.yaml | 136 ++++++++++++++++++ > 1 file changed, 136 insertions(+) > create mode 100644 Documentation/devicetree/bindings/remoteproc/ti,k3-m4f-rproc.yaml > > diff --git a/Documentation/devicetree/bindings/remoteproc/ti,k3-m4f-rproc.yaml b/Documentation/devicetree/bindings/remoteproc/ti,k3-m4f-rproc.yaml > new file mode 100644 > index 000000000000..21b7f14d9dc4 > --- /dev/null > +++ b/Documentation/devicetree/bindings/remoteproc/ti,k3-m4f-rproc.yaml > @@ -0,0 +1,136 @@ > +# SPDX-License-Identifier: (GPL-2.0-only or BSD-2-Clause) > +%YAML 1.2 > +--- > +$id: http://devicetree.org/schemas/remoteproc/ti,k3-m4f-rproc.yaml# > +$schema: http://devicetree.org/meta-schemas/core.yaml# > + > +title: TI K3 M4F processor subsystems > + > +maintainers: > + - Hari Nagalla <hnagalla@xxxxxx> > + - Mathieu Poirier <mathieu.poirier@xxxxxxxxxx> > + > +description: | > + Some K3 family SoCs have Arm Cortex M4F cores. AM64x is a SoC in K3 > + family with a M4F core. Typically safety oriented applications may use > + the M4F core in isolation without an IPC. Where as some industrial and > + home automation applications, may use the M4F core as a remote processor > + with IPC communications. > + > +$ref: /schemas/arm/keystone/ti,k3-sci-common.yaml# > + > +properties: > + > + compatible: > + enum: > + - ti,am64-m4fss > + > + power-domains: > + maxItems: 1 > + > + "#address-cells": > + const: 2 > + > + "#size-cells": > + const: 2 > + > + reg: > + items: > + - description: IRAM internal memory region > + - description: DRAM internal memory region > + > + reg-names: > + items: > + - const: iram > + - const: dram > + > + resets: > + maxItems: 1 > + > + firmware-name: > + $ref: /schemas/types.yaml#/definitions/string > + description: Name of firmware to load for the M4F core > + > + mboxes: > + description: | > + Mailbox specifier denoting the sub-mailbox, to be used for communication > + with the remote processor. This property should match with the > + sub-mailbox node used in the firmware image. > + maxItems: 2 > + > + memory-region: > + description: | > + phandle to the reserved memory nodes to be associated with the > + remoteproc device. The reserved memory nodes should be carveout nodes, > + and should be defined with a "no-map" property as per the bindings in > + Documentation/devicetree/bindings/reserved-memory/reserved-memory.yaml > + Optional memory regions available for firmware specific purposes. > + maxItems: 8 > + items: > + - description: regions used for DMA allocations like vrings, vring buffers > + and memory dedicated to firmware's specific purposes. > + additionalItems: true > + > + sram: > + $ref: /schemas/types.yaml#/definitions/phandle-array > + minItems: 1 > + maxItems: 4 > + items: > + maxItems: 4 You are saying there are 1-4 entries and each entry is 4 cells. What's in the 4 cells? >From the description and example, looks like you only have 1 cell (a phandle) so maxItems should be 1. Your example should fail, but I'm not sure why it doesn't. Rob
