From patchwork Fri Oct 6 12:59:25 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lorenzo Pieralisi X-Patchwork-Id: 730746 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 335241D690; Fri, 6 Oct 2023 12:59:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="m1zaLxvx" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CBA64C433CC; Fri, 6 Oct 2023 12:59:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1696597180; bh=iOWyeF/KRwGpiqZfKpX3chHM50vO4O6sz4uB89KKvbU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=m1zaLxvxNrq/JKivnpB19VtMWfwwpgXr53MZ4plq4TD5Lv6tqCzOQzjEtI4kwUqq9 fW9g2+YNXBj8Tty4Pki+pG/9Jr8ruf+WVYddCHdV/Hifx/TM9Cii+EpmmhEDz7rJZx LYzmf6m0uPyOYlNJKDDO1E/NCl+NVWMDWaovub0H+a0q34H6WFgiF8EM5VABHOiZVy gM6FYvgiS3HA/9XVKi8XNo8w0ePseSOejkcZyPPFC+uu1LCPfzMVPjtLhOZIxx38SP tVysBsxR2fxYfEtuv6Bvr5+kB27ShcKNgWyghtZM8zMHgXGh3rDNtTJE6ytlKLa1tM T9CikPZ4LOCIQ== From: Lorenzo Pieralisi To: linux-kernel@vger.kernel.org Cc: Lorenzo Pieralisi , Rob Herring , linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-acpi@vger.kernel.org, Mark Rutland , Robin Murphy , "Rafael J. Wysocki" , Rob Herring , Fang Xiang , Marc Zyngier Subject: [PATCH v3 1/5] dt-bindings: interrupt-controller: arm,gic-v3: Add dma-noncoherent property Date: Fri, 6 Oct 2023 14:59:25 +0200 Message-Id: <20231006125929.48591-2-lpieralisi@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231006125929.48591-1-lpieralisi@kernel.org> References: <20230905104721.52199-1-lpieralisi@kernel.org> <20231006125929.48591-1-lpieralisi@kernel.org> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 The GIC v3 specifications allow redistributors and ITSes interconnect ports used to access memory to be wired up in a way that makes the respective initiators/memory observers non-coherent. Add the standard dma-noncoherent property to the GICv3 bindings to allow firmware to describe the redistributors/ITSes components and interconnect ports behaviour in system designs where the redistributors and ITSes are not coherent with the CPU. Reviewed-by: Rob Herring Signed-off-by: Lorenzo Pieralisi Cc: Rob Herring --- .../bindings/interrupt-controller/arm,gic-v3.yaml | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/Documentation/devicetree/bindings/interrupt-controller/arm,gic-v3.yaml b/Documentation/devicetree/bindings/interrupt-controller/arm,gic-v3.yaml index 2bc38479a41e..0f4a062c9d6f 100644 --- a/Documentation/devicetree/bindings/interrupt-controller/arm,gic-v3.yaml +++ b/Documentation/devicetree/bindings/interrupt-controller/arm,gic-v3.yaml @@ -106,6 +106,12 @@ properties: $ref: /schemas/types.yaml#/definitions/uint32 maximum: 4096 + dma-noncoherent: + description: + Present if the GIC redistributors permit programming shareability + and cacheability attributes but are connected to a non-coherent + downstream interconnect. + msi-controller: description: Only present if the Message Based Interrupt functionality is @@ -193,6 +199,12 @@ patternProperties: compatible: const: arm,gic-v3-its + dma-noncoherent: + description: + Present if the GIC ITS permits programming shareability and + cacheability attributes but is connected to a non-coherent + downstream interconnect. + msi-controller: true "#msi-cells":