linux-kernel - Re: [PATCH 01/17] dt-bindings: remoteproc: Add OMAP remoteproc bindings

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Message-ID: <CAL_JsqJd_wDMVgFkMRZ7_+0hz93zqJFWEQXY-Sn+3tT-urzRKA@mail.gmail.com>
Date:   Wed, 6 Nov 2019 07:27:56 -0600
From:   Rob Herring <robh@...nel.org>
To:     Tero Kristo <t-kristo@...com>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Ohad Ben-Cohen <ohad@...ery.com>,
        "open list:REMOTE PROCESSOR (REMOTEPROC) SUBSYSTEM" 
        <linux-remoteproc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-omap <linux-omap@...r.kernel.org>,
        Suman Anna <s-anna@...com>, devicetree@...r.kernel.org
Subject: Re: [PATCH 01/17] dt-bindings: remoteproc: Add OMAP remoteproc bindings

On Wed, Nov 6, 2019 at 6:44 AM Tero Kristo <t-kristo@...com> wrote:
>
> On 06/11/2019 05:27, Rob Herring wrote:
> > On Mon, Oct 28, 2019 at 02:42:22PM +0200, Tero Kristo wrote:
> >> From: Suman Anna <s-anna@...com>
> >>
> >> Add the device tree bindings document for the IPU and DSP
> >> remote processor devices on OMAP4+ SoCs.
> >>
> >> Cc: Rob Herring <robh@...nel.org>
> >> Cc: devicetree@...r.kernel.org
> >> Signed-off-by: Suman Anna <s-anna@...com>
> >> Signed-off-by: Tero Kristo <t-kristo@...com>
> >> ---
> >>   .../remoteproc/ti,omap-remoteproc.txt         | 205 ++++++++++++++++++
> >>   1 file changed, 205 insertions(+)
> >>   create mode 100644 Documentation/devicetree/bindings/remoteproc/ti,omap-remoteproc.txt
> >>
> >
> > Looks to be in pretty good shape, but how about doing a schema.
>
> iommu / mailbox is not in schema format, can I just convert this one to
> schema without considering those? If yes, I can go ahead and do it.

The client side both have schema (in dt-schema repo).

> >> diff --git a/Documentation/devicetree/bindings/remoteproc/ti,omap-remoteproc.txt b/Documentation/devicetree/bindings/remoteproc/ti,omap-remoteproc.txt
> >> new file mode 100644
> >> index 000000000000..e2bcfcab21c1
> >> --- /dev/null
> >> +++ b/Documentation/devicetree/bindings/remoteproc/ti,omap-remoteproc.txt
> >> @@ -0,0 +1,205 @@
> >> +OMAP4+ Remoteproc Devices
> >> +=========================
> >> +
> >> +The OMAP family of SoCs usually have one or more slave processor sub-systems
> >> +that are used to offload some of the processor-intensive tasks, or to manage
> >> +other hardware accelerators, for achieving various system level goals.
> >> +
> >> +The processor cores in the sub-system are usually behind an IOMMU, and may
> >> +contain additional sub-modules like Internal RAM and/or ROMs, L1 and/or L2
> >> +caches, an Interrupt Controller, a Cache Controller etc.
> >> +
> >> +The OMAP SoCs usually have a DSP processor sub-system and/or an IPU processor
> >> +sub-system. The DSP processor sub-system can contain any of the TI's C64x,
> >> +C66x or C67x family of DSP cores as the main execution unit. The IPU processor
> >> +sub-system usually contains either a Dual-Core Cortex-M3 or Dual-Core Cortex-M4
> >> +processors.
> >> +
> >> +Remote Processor Node:
> >> +======================
> >> +Each remote processor sub-system is represented as a single DT node. Each node
> >> +has a number of required or optional properties that enable the OS running on
> >> +the host processor (MPU) to perform the device management of the remote
> >> +processor and to communicate with the remote processor. The various properties
> >> +can be classified as constant or variable. The constant properties are dictated
> >> +by the SoC and does not change from one board to another having the same SoC.
> >> +Examples of constant properties include 'iommus', 'reg'. The variable properties
> >> +are dictated by the system integration aspects such as memory on the board, or
> >> +configuration used within the corresponding firmware image. Examples of variable
> >> +properties include 'mboxes', 'memory-region', 'timers', 'watchdog-timers' etc.
> >> +
> >> +Required properties:
> >> +--------------------
> >> +The following are the mandatory properties:
> >> +
> >> +- compatible:       Should be one of the following,
> >> +                "ti,omap4-dsp" for DSPs on OMAP4 SoCs
> >> +                "ti,omap5-dsp" for DSPs on OMAP5 SoCs
> >> +                "ti,dra7-dsp" for DSPs on DRA7xx/AM57xx SoCs
> >> +                "ti,omap4-ipu" for IPUs on OMAP4 SoCs
> >> +                "ti,omap5-ipu" for IPUs on OMAP5 SoCs
> >> +                "ti,dra7-ipu" for IPUs on DRA7xx/AM57xx SoCs
> >> +
> >> +- iommus:   phandles to OMAP IOMMU nodes, that need to be programmed
> >> +            for this remote processor to access any external RAM memory or
> >> +            other peripheral device address spaces. This property usually
> >> +            has only a single phandle. Multiple phandles are used only in
> >> +            cases where the sub-system has different ports for different
> >> +            sub-modules within the processor sub-system (eg: DRA7 DSPs),
> >> +            and need the same programming in both the MMUs.
>
> ^ the target of this is not in schema.

You mean the OMAP IOMMU binding? That doesn't matter at all.

Rob