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Tue, 30 Jun 2020 17:11:06 +0000 From: Ben Levinsky To: Stefano Stabellini , Rob Herring CC: "ohad@wizery.com" , Michal Simek , Rajan Vaja , "mark.rutland@arm.com" , "linux-remoteproc@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "devicetree@vger.kernel.org" , "linux-kernel@vger.kernel.org" , Bjorn Andersson Subject: RE: [PATCH v4 4/5] dt-bindings: remoteproc: Add documentation for ZynqMP R5 rproc bindings Thread-Topic: [PATCH v4 4/5] dt-bindings: remoteproc: Add documentation for ZynqMP R5 rproc bindings Thread-Index: AQHWGl7uxdGBAyULe0azD2FJNJZOnqijj0uAgBdEEWCAF8YrgIAeHusAgAAc24CAAN6D4IAAGDLg Date: Tue, 30 Jun 2020 17:11:06 +0000 Message-ID: References: <1587749770-15082-1-git-send-email-ben.levinsky@xilinx.com> <1587749770-15082-5-git-send-email-ben.levinsky@xilinx.com> <20200511221755.GA13585@bogus> <20200630022029.GC407764@builder.lan> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-Auto-Response-Suppress: DR, RN, NRN, OOF, AutoReply X-MS-TNEF-Correlator: authentication-results: xilinx.com; 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x-ms-exchange-antispam-messagedata: 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 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: xilinx.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: BYAPR02MB4407.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: dbb9f62c-d588-44c2-8e1c-08d81d189392 X-MS-Exchange-CrossTenant-originalarrivaltime: 30 Jun 2020 17:11:06.3312 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 657af505-d5df-48d0-8300-c31994686c5c X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: qc3JCfyRHL4Xz7lbLRcjgpwGEJZkgvPEUmlLIekP4WRVOHtZJGHdoGT5cJW3yaiJwG9wouELGm7B7wk01pX/9g== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR02MB5190 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Rob, Below is proposal simplified device tree binding as per the below discussio= n. Best Regards, Ben reserved-memory { #address-cells =3D <1>; #size-cells =3D <1>; ranges; elf_load: rproc@300000000 { no-map; reg =3D <0x30000000 0x40000>; }; }; Rpu { compatible =3D "xlnx,zynqmp-r5-remoteproc-1.0"; #address-cells =3D <1>; #size-cells =3D <1>; ranges; lockstep-mode =3D <0>; r5_0 { ranges; #address-cells =3D <1>; #size-cells =3D <1>; memory-region =3D <&elf_load>; pnode-id =3D <0x10>; }; }; -----Original Message----- From: Ben Levinsky=20 Sent: Tuesday, June 30, 2020 8:39 AM To: Bjorn Andersson ; Stefano Stabellini Cc: Rob Herring ; ohad@wizery.com; Michal Simek ; Jolly Shah ; Rajan Vaja ;= mark.rutland@arm.com; linux-remoteproc@vger.kernel.org; linux-arm-kernel@l= ists.infradead.org; devicetree@vger.kernel.org; linux-kernel@vger.kernel.or= g; Stefano Stabellini Subject: RE: [PATCH v4 4/5] dt-bindings: remoteproc: Add documentation for = ZynqMP R5 rproc bindings Hi Bjorn, -----Original Message----- From: Bjorn Andersson Sent: Monday, June 29, 2020 7:20 PM To: Stefano Stabellini Cc: Rob Herring ; Ben Levinsky ; ohad= @wizery.com; Michal Simek ; Jolly Shah ; Rajan Vaja ; mark.rutland@arm.com; linux-remoteproc= @vger.kernel.org; linux-arm-kernel@lists.infradead.org; devicetree@vger.ker= nel.org; linux-kernel@vger.kernel.org; Stefano Stabellini Subject: Re: [PATCH v4 4/5] dt-bindings: remoteproc: Add documentation for = ZynqMP R5 rproc bindings On Mon 29 Jun 17:37 PDT 2020, Stefano Stabellini wrote: > On Wed, 10 Jun 2020, Rob Herring wrote: > > On Tue, May 26, 2020 at 11:40 AM Ben Levinsky wro= te: > > > > > > Hi Rob, > > > > > > The Xilinx R5 Remoteproc driver has been around for a long time -- ad= mittedly we should have upstreamed it long ago. The driver in the current f= orm is using an "classic" remoteproc device tree node as described here. > >=20 > > I would rather not have 2 possible bindings to maintain. If there's=20 > > been no rush to upstream this til now, then it can wait longer. > >=20 > > > > > > I am working with Stefano to come up with an appropriate System Devic= e Tree representation but it is not going to be ready right away. Our prefe= rence would be to upstream the remoteproc node and driver in their current = forms while system device tree is maturing. > >=20 > > There's obviously going to still need to be some sort of description=20 > > of the interface between cores, but this has parts that obviously=20 > > conflict with what's getting defined for system DT. The TCMs are the=20 > > most obvious. If you can remove (or hardcode in the driver) what=20 > > conflicts, then perhaps this can be upstreamed now. >=20 >=20 > Hi Rob, >=20 > Sorry it took a while to answer back but we wanted to do some research=20 > to make sure the reply is correct. >=20 >=20 > The System Device Tree version of the OpenAMP remoteproc bindings aims=20 > at being simpler and vendor-neutral. As anything else System Device=20 > Tree, Lopper will read it and generate a "traditional" device tree=20 > with the existing remoteproc bindings. In that sense, it might not=20 > affect Linux directly. >=20 Can you give some examples of how you will be able to describe the hardware= involved in powering/clocking resources surrounding your remoteproc and th= e necessary resources in a "simpler and vendor neutral" way that then can be further lopped(?) into something that Linux can use to= control any remoteproc? > However, given the fragmentation of the remoteproc bindings across=20 > multiple vendors (they are all different), I think it is a good idea=20 > for Linux, for System Device Tree, and in general to come up with=20 > simpler remoteproc bindings, more aligned between the vendors. If=20 > nothing else, it is going to make Lopper's development easier. >=20 In my view the big reason for the fragmentation between bindings is because= they all describe different hardware. There has been common properties of = remoteprocs discussed, but apart from the firmware-name property I don't th= ink we have agreed on any. >=20 > So I think it is a good idea to take this opportunity to simplify the=20 > Xilinx remoteproc bindings as you suggested. The idea of to removing=20 > the TCM nodes is a good one. In addition I asked Ben to have a look at=20 > whether the mboxes and mbox-names properties can be removed too. >=20 If your remoteproc uses a mailbox for signaling, then this should be descri= bed in devicetree. This will allow you to reuse components in other designs= where either part is replaced or reused. [Ben Levinsky] The Xilinx R5 remoteproc binding can optionally use the mail= box. That is if loading a simple binary that is not making use of IPC then = the mailbox is optional and not needed. Not sure if you still would prefer = to have the example showcasing use of mailbox then. Regards, Bjorn > Ben will reply with a simplified bindings proposal.