From patchwork Thu May 7 22:41:13 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Serge Semin X-Patchwork-Id: 11535039 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id A7834159A for ; Thu, 7 May 2020 22:41:42 +0000 (UTC) Received: by mail.kernel.org (Postfix) id A3EFA20A8B; Thu, 7 May 2020 22:41:42 +0000 (UTC) Delivered-To: soc@kernel.org Received: from mail.baikalelectronics.ru (mail.baikalelectronics.com [87.245.175.226]) by mail.kernel.org (Postfix) with ESMTP id 3F0E320870; Thu, 7 May 2020 22:41:42 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3F0E320870 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=baikalelectronics.ru Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=Sergey.Semin@baikalelectronics.ru Received: from localhost (unknown [127.0.0.1]) by mail.baikalelectronics.ru (Postfix) with ESMTP id 8A109803087C; Thu, 7 May 2020 22:41:41 +0000 (UTC) X-Virus-Scanned: amavisd-new at baikalelectronics.ru Received: from mail.baikalelectronics.ru ([127.0.0.1]) by localhost (mail.baikalelectronics.ru [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id vJHN5w8HRwJK; Fri, 8 May 2020 01:41:40 +0300 (MSK) From: Serge Semin To: Thomas Bogendoerfer , Greg Kroah-Hartman , Arnd Bergmann , Rob Herring List-Id: CC: Serge Semin , Serge Semin , Alexey Malahov , Paul Burton , Ralf Baechle , Tony Lindgren , Tero Kristo , Manivannan Sadhasivam , Jeffrey Hugo , Linus Walleij , Olof Johansson , , , , Subject: [PATCH v2 1/4] dt-bindings: bus: Add Baikal-T1 AXI-bus binding Date: Fri, 8 May 2020 01:41:13 +0300 Message-ID: <20200507224116.1523-2-Sergey.Semin@baikalelectronics.ru> In-Reply-To: <20200507224116.1523-1-Sergey.Semin@baikalelectronics.ru> References: <20200306130731.938808030702@mail.baikalelectronics.ru> <20200507224116.1523-1-Sergey.Semin@baikalelectronics.ru> MIME-Version: 1.0 X-ClientProxiedBy: MAIL.baikal.int (192.168.51.25) To mail (192.168.51.25) AXI3-bus is the main communication bus connecting all high-speed peripheral IP-cores with RAM controller and with MIPS P5600 cores on Baikal-T1 SoC. This binding describes the DW AMBA 3 AXI Inteconnect and Errors Handler Block synthesized on top of it, which are responsible for the AXI-bus traffic arbitration and errors reporting upstream to CPU. Baikal-T1 AXI-bus DT node is supposed to be compatible with "be,bt1-axi" and "simple-bus" drivers, should have reg property with AXI-bus QOS registers space, syscon phandle reference to the Baikal-T1 System Controller, IRQ line declared, AXI Interconnect reference clock and reset line. Signed-off-by: Serge Semin Cc: Alexey Malahov Cc: Paul Burton Cc: Ralf Baechle Cc: Tony Lindgren Cc: Tero Kristo Cc: Manivannan Sadhasivam Cc: Jeffrey Hugo Cc: Linus Walleij Cc: Olof Johansson Cc: linux-mips@vger.kernel.org Cc: soc@kernel.org Reviewed-by: Rob Herring --- Rob, I had to remove your Reviewed-by tag, since new changes had been introduced. Changelog v2: - Move driver to the bus subsystem. - Use dual GPL/BSD license. - Use single lined copyright header. - Lowercase the unit-address. - Convert a simple EHB block binding to the Baikal-T1 AXI-bus one with interconnect capabilities support. - Replace "additionalProperties: false" property with "unevaluatedProperties: false". - Add AXI reference clock and reset support. - Add syscon phandle reference to the Baikal-T1 System Controller node. --- .../bindings/bus/baikal,bt1-axi.yaml | 95 +++++++++++++++++++ 1 file changed, 95 insertions(+) create mode 100644 Documentation/devicetree/bindings/bus/baikal,bt1-axi.yaml diff --git a/Documentation/devicetree/bindings/bus/baikal,bt1-axi.yaml b/Documentation/devicetree/bindings/bus/baikal,bt1-axi.yaml new file mode 100644 index 000000000000..082ab5c3b4f5 --- /dev/null +++ b/Documentation/devicetree/bindings/bus/baikal,bt1-axi.yaml @@ -0,0 +1,95 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +# Copyright (C) 2020 BAIKAL ELECTRONICS, JSC +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/bus/baikal,bt1-axi.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Baikal-T1 AXI-bus + +maintainers: + - Serge Semin + +description: | + AXI3-bus is the main communication bus of Baikal-T1 SoC connecting all + high-speed peripheral IP-cores with RAM controller and with MIPS P5600 + cores. Traffic arbitration is done by means of DW AXI Interconnect (so + called AXI Main Interconnect) routing IO requests from one block to + another: from CPU to SoC peripherals and between some SoC peripherals + (mostly between peripheral devices and RAM, but also between DMA and + some peripherals). In case of any protocol error, device not responding + an IRQ is raised and a faulty situation is reported to the AXI EHB + (Errors Handler Block) embedded on top of the DW AXI Interconnect and + accessible by means of the Baikal-T1 System Controller. + +allOf: + - $ref: /schemas/simple-bus.yaml# + +properties: + compatible: + contains: + const: baikal,bt1-axi + + reg: + maxItems: 1 + + '#interconnect-cells': + const: 1 + + syscon: + $ref: /schemas/types.yaml#definitions/phandle + description: Phandle to the Baikal-T1 System Controller DT node + + interrupts: + maxItems: 1 + + clocks: + items: + - description: Main Interconnect uplink reference clock + + clock-names: + items: + - const: aclk + + resets: + items: + - description: Main Interconnect reset line + + reset-names: + items: + - const: arst + +unevaluatedProperties: false + +required: + - compatible + - reg + - syscon + - interrupts + - clocks + - clock-names + +examples: + - | + #include + + bus@1f05a000 { + compatible = "baikal,bt1-axi", "simple-bus"; + reg = <0 0x1f05a000 0 0x1000>; + #address-cells = <1>; + #size-cells = <1>; + #interconnect-cells = <1>; + + syscon = <&syscon>; + + ranges; + + interrupts = ; + + clocks = <&ccu_axi 0>; + clock-names = "aclk"; + + resets = <&ccu_axi 0>; + reset-names = "arst"; + }; +...