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charset="us-ascii" Content-Transfer-Encoding: quoted-printable Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-OriginatorOrg: chipsnmedia.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: SL2P216MB1246.KORP216.PROD.OUTLOOK.COM X-MS-Exchange-CrossTenant-Network-Message-Id: c3509634-61be-4afc-3d4b-08dd96932e5c X-MS-Exchange-CrossTenant-originalarrivaltime: 19 May 2025 05:08:23.8358 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 4d70c8e9-142b-4389-b7f2-fa8a3c68c467 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: n9F1LF0JX1mIPYYkbeeUWJEDShw4iThNZ3H/Qv20yMt2p0xV5NmoT0euuwaXracSbog6nBAM+acqAgKdV4cLUkLJP0qdpUiFpCYOuEkXq2g= X-MS-Exchange-Transport-CrossTenantHeadersStamped: SE1P216MB2083 Hi, Krzysztof. >-----Original Message----- >From: Krzysztof Kozlowski >Sent: Friday, May 16, 2025 9:56 PM >To: Nas Chung >Cc: mchehab@kernel.org; hverkuil@xs4all.nl; sebastian.fricke@collabora.com= ; >robh@kernel.org; krzk+dt@kernel.org; conor+dt@kernel.org; linux- >media@vger.kernel.org; devicetree@vger.kernel.org; linux- >kernel@vger.kernel.org; linux-imx@nxp.com; marex@denx.de; jackson.lee >; lafley.kim >Subject: Re: [PATCH v2 2/8] dt-bindings: media: nxp: Add Wave6 video codec >device > >On 13/05/2025 09:39, Nas Chung wrote: >>> >>> All of above are wrong for the SoC... >>> >>>> >>>> #include >>>> #include >>>> >>>> soc { >>>> #address-cells =3D <2>; >>>> #size-cells =3D <2>; >>>> >>>> vpu: video-codec { >>>> compatible =3D "nxp,imx95-vpu", "cnm,wave633c"; >>> >>> What does this device represent? It is not "ctrl", because you made ctr= l >>> separate device node. Your binding description suggests that is the VPU >>> control region. >> >> My intention was to represent the MMIO VPU device, which includes >> both the core and control nodes. > >Then what is the VPU device if not CTRL? What is the CTRL device? The VPU device represents the entire VPU hardware block, which includes 1 CTRL component(node) and 4 CORE components(nodes). The CTRL device represents the VCPU, a 32-bit processor embedded within the VPU hardware block. This VCPU is responsible for executing the VPU firmware= . The CTRL device is in charge of tasks such as firmware booting, power manag= ement (sleep and wakeup command), and managing memory regions that are exclusivel= y accessed by the firmware. The CORE device represents the Video Coding Engine, which is the hardware c= ore responsible for performing the actual video encoding and decoding operation= s. I intended to represent the VPU device as a single grouping or parent node = to reflect that CTRL and CORE are integrated in a VPU hardware block. Thanks. Nas. > > >Best regards, >Krzysztof