From patchwork Sat May 30 07:35:53 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Serge Semin X-Patchwork-Id: 11580071 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 E297E14C0 for ; Sat, 30 May 2020 07:36:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D10F3207D0 for ; Sat, 30 May 2020 07:36:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728895AbgE3HgZ (ORCPT ); Sat, 30 May 2020 03:36:25 -0400 Received: from mail.baikalelectronics.com ([87.245.175.226]:52062 "EHLO mail.baikalelectronics.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728820AbgE3HgX (ORCPT ); Sat, 30 May 2020 03:36:23 -0400 Received: from localhost (unknown [127.0.0.1]) by mail.baikalelectronics.ru (Postfix) with ESMTP id EB4B18030778; Sat, 30 May 2020 07:36:20 +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 yCrZ2nmdqZH2; Sat, 30 May 2020 10:36:20 +0300 (MSK) From: Serge Semin To: Wim Van Sebroeck , Guenter Roeck , Rob Herring CC: Serge Semin , Serge Semin , Rob Herring , Alexey Malahov , Thomas Bogendoerfer , Arnd Bergmann , , , , Subject: [PATCH v4 3/7] dt-bindings: watchdog: dw-wdt: Add watchdog TOPs array property Date: Sat, 30 May 2020 10:35:53 +0300 Message-ID: <20200530073557.22661-4-Sergey.Semin@baikalelectronics.ru> In-Reply-To: <20200530073557.22661-1-Sergey.Semin@baikalelectronics.ru> References: <20200530073557.22661-1-Sergey.Semin@baikalelectronics.ru> MIME-Version: 1.0 X-ClientProxiedBy: MAIL.baikal.int (192.168.51.25) To mail (192.168.51.25) Sender: linux-mips-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org In case if DW Watchdog IP core is built with WDT_USE_FIX_TOP == false, a custom timeout periods are used to preset the timer counter. In this case that periods should be specified in a new "snps,watchdog-tops" property of the DW watchdog dts node. Signed-off-by: Serge Semin Reviewed-by: Rob Herring Reviewed-by: Guenter Roeck Cc: Alexey Malahov Cc: Thomas Bogendoerfer Cc: Arnd Bergmann Cc: linux-mips@vger.kernel.org --- Changelog v2: - Rearrange SoBs. - Move $ref to the root level of the "snps,watchdog-tops" property so does the constraints. - Add default TOP values array. - Discard the label definition from the new bindings example. Changelog v3: - Remove items property and move the minItems and maxItems constraints to the root level of the snps,watchdog-tops property. --- .../bindings/watchdog/snps,dw-wdt.yaml | 32 +++++++++++++++++++ 1 file changed, 32 insertions(+) diff --git a/Documentation/devicetree/bindings/watchdog/snps,dw-wdt.yaml b/Documentation/devicetree/bindings/watchdog/snps,dw-wdt.yaml index 5bf6dc6377f3..d9fc7bb851b1 100644 --- a/Documentation/devicetree/bindings/watchdog/snps,dw-wdt.yaml +++ b/Documentation/devicetree/bindings/watchdog/snps,dw-wdt.yaml @@ -39,6 +39,23 @@ properties: description: Phandle to the DW Watchdog reset lane maxItems: 1 + snps,watchdog-tops: + $ref: /schemas/types.yaml#/definitions/uint32-array + description: | + DW APB Watchdog custom timer intervals - Timeout Period ranges (TOPs). + Each TOP is a number loaded into the watchdog counter at the moment of + the timer restart. The counter decrementing happens each tick of the + reference clock. Therefore the TOPs array is equivalent to an array of + the timer expiration intervals supported by the DW APB Watchdog. Note + DW APB Watchdog IP-core might be synthesized with fixed TOP values, + in which case this property is unnecessary with default TOPs utilized. + default: [0x0001000 0x0002000 0x0004000 0x0008000 + 0x0010000 0x0020000 0x0040000 0x0080000 + 0x0100000 0x0200000 0x0400000 0x0800000 + 0x1000000 0x2000000 0x4000000 0x8000000] + minItems: 16 + maxItems: 16 + unevaluatedProperties: false required: @@ -55,4 +72,19 @@ examples: clocks = <&per_base_clk>; resets = <&wdt_rst>; }; + + - | + watchdog@ffd02000 { + compatible = "snps,dw-wdt"; + reg = <0xffd02000 0x1000>; + interrupts = <0 171 4>; + clocks = <&per_base_clk>; + clock-names = "tclk"; + snps,watchdog-tops = <0x000000FF 0x000001FF 0x000003FF + 0x000007FF 0x0000FFFF 0x0001FFFF + 0x0003FFFF 0x0007FFFF 0x000FFFFF + 0x001FFFFF 0x003FFFFF 0x007FFFFF + 0x00FFFFFF 0x01FFFFFF 0x03FFFFFF + 0x07FFFFFF>; + }; ...