From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=114.242.206.163 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1792989198; b=bRquZdan7fczk7mOqQSQZAK+9SvmXtC4jvpmZdAfuyoTZ9bmoSC6polA+o0ObTpsJPfn HLx0fsab55UihDDryVJnmJpGaL4yQXNOjqG44PJIxEVypYp4g1vOSXz4Z7r4dGT6TIcyK VXaCrmPjdV6CzZaCbmitLazU3owjrVNCTKxkxKnObtI0FHfm1aMaPw2NKMiMefXAqQHKb hBtTKeQ0TtR+YuAzXZWhFqNAkY4uUKesqlitoYqyMFX5jsJlG2slkV8LsdsYWX8zWVhu9 VrxYvIr1j5zkZu+VO0bWy7sSMIosjqek0g6UdS+Bi9NdLfG+c8p5r0TJiKPpEHtG6Kw== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1792989198; h=DMARC-Filter:Received:Received:From:To:Cc:Subject:Date:Message-ID: X-Mailer:MIME-Version:Content-Transfer-Encoding:X-CM-TRANSID: X-CM-SenderInfo:X-Coremail-Antispam; bh=OLaBTI8wSKAzgSQXZOyB0488XXKM5pNdxDw1IYaL8d8=; b=zSwSkLcjuN5uDgFjSPIlwWNDmNEUS8UKnmibfxfNpw4dWV7XbSpuJlC3ttlXgfED61eE t8fJmnsHjxw9yKxHckid+e63plOMZnR7HsDJKA+TudeIGB8t/xEoGiASWf2F08Dm3jxmr wYDddqCfFgvFrtxbDYqgaVcxBQbjrl8e2jQ6BvKHnLQC1EeLOZAbCL0dFIMFBImvxn7kt 8xFtkyVrofu4Zradvt1E2cQurpV+9cvE/9wJqycP3aYzGnAeCQ/IALM46yG7s3GSLS80p v+KpLq4/043erhJa0nkWOS/uA6TbA2D2YlLa9E/+UiW/IjIUV5fCzwVP4E/qCh1jcXQ== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none header.from=loongson.cn; spf=pass smtp.mailfrom=loongson.cn; arc=none smtp.remote-ip=114.242.206.163 Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 75F4B606A31A; Mon, 26 Oct 2026 04:33:17 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 75F4B606A31A Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=loongson.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=loongson.cn Received: from loongson.cn (unknown [223.64.69.17]) by gateway (Coremail) with SMTP id _____8Cx_9IL2N5qzF0ZAA--.8332S3; Mon, 26 Oct 2026 12:33:15 +0800 (CST) Received: from kernelserver (unknown [223.64.69.17]) by front1 (Coremail) with SMTP id qMiowJAx1cwI2N5q6jgwAA--.7070S2; Mon, 26 Oct 2026 12:33:13 +0800 (CST) From: Binbin Zhou To: Binbin Zhou , Huacai Chen , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Vinod Koul , Frank Li , dmaengine@vger.kernel.org Cc: Huacai Chen , Xuerui Wang , loongarch@lists.linux.dev, devicetree@vger.kernel.org, Keguang Zhang , Binbin Zhou Subject: [PATCH v3 0/2] Add Loongson-2K0300 APB DMA mux support Date: Mon, 26 Oct 2026 12:33:04 +0800 Message-ID: X-Mailer: git-send-email 2.52.0 X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CM-TRANSID:qMiowJAx1cwI2N5q6jgwAA--.7070S2 X-CM-SenderInfo: p2kr3uplqex0o6or00hjvr0hdfq/1tbiAQEMCGretPgwNQAAs5 X-Coremail-Antispam: 1Uk129KBj93XoWxGF4DZFyfuw18ZF1fCF4UAwc_yoW5Gr4rpa 9xC3y3Kr4DtFy7Aws3Jay8urW5Zr9xJr12gFWaqw1q9a98W3yjqa1Iy3Wqvry7Cr18AFW2 vrykCrW8GF1UZrcCm3ZEXasCq-sJn29KB7ZKAUJUUUU8529EdanIXcx71UUUUU7KY7ZEXa sCq-sGcSsGvfJ3Ic02F40EFcxC0VAKzVAqx4xG6I80ebIjqfuFe4nvWSU5nxnvy29KBjDU 0xBIdaVrnRJUUUkIb4IE77IF4wAFF20E14v26r1j6r4UM7CY07I20VC2zVCF04k26cxKx2 IYs7xG6rWj6s0DM7CIcVAFz4kK6r106r15M28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48v e4kI8wA2z4x0Y4vE2Ix0cI8IcVAFwI0_Xr0_Ar1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI 0_Cr0_Gr1UM28EF7xvwVC2z280aVAFwI0_Cr0_Gr1UM28EF7xvwVC2z280aVCY1x0267AK xVW8Jr0_Cr1UM2AIxVAIcxkEcVAq07x20xvEncxIr21l57IF6xkI12xvs2x26I8E6xACxx 1l5I8CrVACY4xI64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r1q6rW5McIj6I8E87Iv 67AKxVW8JVWxJwAm72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr41l42xK82IYc2 Ij64vIr41l4I8I3I0E4IkC6x0Yz7v_Jr0_Gr1lx2IqxVAqx4xG67AKxVWUJVWUGwC20s02 6x8GjcxK67AKxVWUGVWUWwC2zVAF1VAY17CE14v26r1q6r43MIIYrxkI7VAKI48JMIIF0x vE2Ix0cI8IcVAFwI0_Xr0_Ar1lIxAIcVC0I7IYx2IY6xkF7I0E14v26F4j6r4UJwCI42IY 6xAIw20EY4v20xvaj40_Jr0_JF4lIxAIcVC2z280aVAFwI0_Gr0_Cr1lIxAIcVC2z280aV CY1x0267AKxVW8JVW8JrUvcSsGvfC2KfnxnUUI43ZEXa7IU8QJ57UUUUU== Hi all: Loongson-2K0300 integrates a CMC DMA controller with 8 physical channels. Peripheral DMA requests are not hard-wired to these channels; they are routed through the CHIP_CTRL13/14/15 DMA_MAP fields. This series adds support for that DMA request router. Patch 1 adds the DT binding constants for the peripheral request IDs and yaml file for the DMA mux. Patch 2 adds the driver, Kconfig symbol and Makefile entry. The driver registers with of_dma_router_register(). In the route allocation callback it validates the specifier, programs the SoC-specific route register, and forwards to the parent CMC DMA controller. Thanks. Binbin. ========= V3: Patch(1/2): - Merged the two commits containing the dt-binding header file and the YAML file; no other changes were made; - Add Acked-by tag from Conor. Patch(2/2): - Append the dmamux object to the existing CMC DMA line; - Add loongson2_dmamux_assign_bits() helper, no functional change; - Add Reviewed-by tag from Frank. Link to V2: https://lore.kernel.org/all/cover.1791535540.git.zhoubinbin@loongson.cn/ V2: Patch(1/3): - Drop LS2K0300_DMA_REQ_MAX as it is not part of the ABI; Patch(2/3): - A more detailed description of `dma-cells`; - Add the `dma_requests` constraint Patch(3/3): - Drop loongson2_dmamux_map->shift; - Move of_parse_phandle() into loongson2_dmamux_route_allocate() avoid UAF; - Drop loongson2_dmamux->dma_np; - Check dma_requests; - Add devm_add_action_or_reset() instead of .remove(); - Replace `metux()` with `spinlock()`, which has lower overhead; - Add loongson2_dmamux_route_free(). Link to V1: https://lore.kernel.org/all/cover.1790068409.git.zhoubinbin@loongson.cn/ Binbin Zhou (2): dt-bindings: dma: Document DMA mux support for Loongson-2K0300 dmaengine: loongson: Add Loongson-2K0300 APB DMA mux driver .../dma/loongson,ls2k0300-dmamux.yaml | 72 ++++ MAINTAINERS | 3 + drivers/dma/loongson/Makefile | 2 +- drivers/dma/loongson/loongson2-apb-dmamux.c | 404 ++++++++++++++++++ .../dt-bindings/dma/loongson,ls2k-dmamux.h | 53 +++ 5 files changed, 533 insertions(+), 1 deletion(-) create mode 100644 Documentation/devicetree/bindings/dma/loongson,ls2k0300-dmamux.yaml create mode 100644 drivers/dma/loongson/loongson2-apb-dmamux.c create mode 100644 include/dt-bindings/dma/loongson,ls2k-dmamux.h base-commit: aff5e6a77fc69a7c490246465940d18422d7c631 -- 2.52.0