From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id AA237C982C1 for ; Thu, 17 Sep 2026 06:03:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=7bSiMSCEzJHVGbF2y5IbvpKJPc+IlGdFpPiZbAoOXa8=; b=Du25O27JhLVpfpyGB6zk8hldSQ UQpxvjZAUUCUztqVvqWOcncb5ZVQxcQLJtllEst90AhgfRSHWJuE4VjG69vapUuOWtQVqMvlkN2X3 Ub6QsVNveoaEX9R4UYSLvXoos7ZKxjBdgpDOzjka49GlIUWKBMKrkv++ol7P+7y72dsOlJL8ClPTn xJfAavxN9CClDiau7f9gcGBJ20djL8Y6LO5OQAWGluhTvKpR9Dq80h17fUVtl2cjB/Ne5V9OIuQYY Olcdm2MAncA2UBFDJskBFrIvZ8DTR7HL3PpuXHsoNhhdUfhdOFkld1LsKhkd38cl0pT5C0/83nrSG zHJJeZPQ==; 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charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 17/09/2026 05:07, Zhentao Guo wrote: > Hi Krzysztof, > >> On Mon, Sep 14, 2026 at 04:10:20PM +0800, Zhentao Guo wrote: >>> Describe the initial support for the V4L2 stateless video decoder >>> driver used with the Amlogic S4 (S805X2) platform. >> Drop driver. Describe the hardware instead. > OK，got it. >>> Signed-off-by: Zhentao Guo >>> --- >>> .../devicetree/bindings/media/amlogic,s4-vdec.yaml | 114 +++++++++++++++++++++ >>> 1 file changed, 114 insertions(+) >>> >>> diff --git a/Documentation/devicetree/bindings/media/amlogic,s4-vdec.yaml b/Documentation/devicetree/bindings/media/amlogic,s4-vdec.yaml >>> new file mode 100644 >>> index 000000000000..d350b3e68a38 >>> --- /dev/null >>> +++ b/Documentation/devicetree/bindings/media/amlogic,s4-vdec.yaml >>> @@ -0,0 +1,114 @@ >>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) >>> +# Copyright (C) 2025 Amlogic, Inc. All rights reserved >>> +%YAML 1.2 >>> +--- >>> +$id: http://devicetree.org/schemas/media/amlogic,s4-vdec.yaml# >>> +$schema: http://devicetree.org/meta-schemas/core.yaml# >>> + >>> +title: Amlogic Video Decode Accelerator >>> + >>> +maintainers: >>> + - Zhentao Guo >>> + >>> +description: >>> + The Video Decoder Accelerator present on Amlogic SOCs. >>> + It supports stateless h264 decoding. >>> + >>> +properties: >>> + compatible: >>> + const: amlogic,s4-vdec >>> + >>> + reg: >>> + maxItems: 2 >>> + >>> + reg-names: >>> + items: >>> + - const: dos >>> + - const: dmc >>> + >>> + interrupts: >>> + maxItems: 2 >>> + >>> + interrupt-names: >>> + items: >>> + - const: core_hvdec >>> + - const: core_vdec >> Drop "core_" from both... or rather some consistency would be more >> useful. Below you call them core_v and core_h, but there is also: >> >>> + >>> + clocks: >>> + items: >>> + - description: Clock for dos core >> core dos? > > To explain this, I would like to show you the structure diagram of the > Amlogic hardware decoder IP: > > +-----------+------------------------+ > |      |                        | > |      |        vdec   | > |  | | > |    dos   +------------------------+ > | | | > |       |       hvdec           | > | | | > +-----------+------------------------+ > > The IP consists of three cores. Dos core is in the front of the IP, > which controls the rest two cores. The actual hardware decoding is > handled by the two cores vdec and hvdec. > > Each of the three cores has its own independent clock source. So everything could be called consistently "dos", "vdec" and "hvdec" in all properties (clocks, interrupts etC). Best regards, Krzysztof