From patchwork Tue Oct 23 09:20:39 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tudor Ambarus X-Patchwork-Id: 988089 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-i2c-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=microchip.com Authentication-Results: ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=microchiptechnology.onmicrosoft.com header.i=@microchiptechnology.onmicrosoft.com header.b="JZv0G64r"; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 42fSYH5WxRz9sNR for ; Tue, 23 Oct 2018 20:20:51 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728508AbeJWRnN (ORCPT ); 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Tue, 23 Oct 2018 09:20:39 +0000 Received: from BN6PR11MB1842.namprd11.prod.outlook.com ([fe80::11b7:21db:803a:7cfa]) by BN6PR11MB1842.namprd11.prod.outlook.com ([fe80::11b7:21db:803a:7cfa%4]) with mapi id 15.20.1250.028; Tue, 23 Oct 2018 09:20:39 +0000 From: To: , , , , , , CC: Subject: [RESEND PATCH 1/2] i2c: enable buses to save their clock frequency in adapter Thread-Topic: [RESEND PATCH 1/2] i2c: enable buses to save their clock frequency in adapter Thread-Index: AQHUarGpO/aLa/rmXE6ECdVIjIJ/FQ== Date: Tue, 23 Oct 2018 09:20:39 +0000 Message-ID: <20181023092025.32463-2-tudor.ambarus@microchip.com> References: <20181023092025.32463-1-tudor.ambarus@microchip.com> In-Reply-To: <20181023092025.32463-1-tudor.ambarus@microchip.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: CWLP265CA0181.GBRP265.PROD.OUTLOOK.COM (2603:10a6:401:4d::25) To BN6PR11MB1842.namprd11.prod.outlook.com (2603:10b6:404:103::18) authentication-results: spf=none (sender IP is ) smtp.mailfrom=Tudor.Ambarus@microchip.com; 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DIR:OUT; SFP:1101; SCL:1; SRVR:BN6PR11MB1524; H:BN6PR11MB1842.namprd11.prod.outlook.com; FPR:; SPF:None; LANG:en; PTR:InfoNoRecords; MX:1; A:1; received-spf: None (protection.outlook.com: microchip.com does not designate permitted sender hosts) x-microsoft-antispam-message-info: EY1bKs9mcd0aqgQHl3Fmt21kOleCdPI4WjosUf6/kIX9lGOLT6AGrKAv3XleiFyAFHd0QNARYC7jbeOVJIfZ/2nxdilorkd6VE4PYoq2Mk/kGVXewa0Rx7NpUKthOlnijAyRVjJ+0IaTAl0atlV7hR4V5W3Jy8A8rqJiaZZmMcwGN1m0Uz+8zE5OsRGSPx7HnTkUfhFauoSsICZld/uIagl+wySg4FZF5U3XR4CSICxid5TzV3iY93ltDWdOMCWidPqzsKDnIL+/DzBnqb2p5z4IL5eE8OQODzkv0yMBue4VT9Ian7uQc86hWx4AXQUCJFFAUtr/5VYKXOBtrcZa+sk1eEnzfDbwvpqaZjEWs84= spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM MIME-Version: 1.0 X-MS-Exchange-CrossTenant-Network-Message-Id: 60ba0b3c-5305-495b-f65b-08d638c8cc00 X-MS-Exchange-CrossTenant-originalarrivaltime: 23 Oct 2018 09:20:39.0639 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 3f4057f3-b418-4d4e-ba84-d55b4e897d88 X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN6PR11MB1524 X-OriginatorOrg: microchip.com Sender: linux-i2c-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org The clock-frequency property is not mandatory for the i2c buses. If it's not present in the device tree, the buses __usually__ assume it's 100kHZ (see altera, at91, axxia, etc.). Broadcom uses a 375kHZ default clock-frequency, so the default clock frequency varies from bus to bus. There are i2c clients that need to know the bus clock frequency in order to compute their wake token (see atecc508a i2c client). The clock-frequency value has to be propagated to the i2c clients, otherwise, if they will not find the i2c bus clock frequency in the device tree, they will have to make their own assumption of the clock frequency. Spare the i2c clients of making wrong assumptions of the i2c bus clock frequency and enable the buses to save their clock frequency in adapter. Signed-off-by: Tudor Ambarus --- include/linux/i2c.h | 1 + 1 file changed, 1 insertion(+) diff --git a/include/linux/i2c.h b/include/linux/i2c.h index 65b4eaed1d96..f238da204c49 100644 --- a/include/linux/i2c.h +++ b/include/linux/i2c.h @@ -677,6 +677,7 @@ struct i2c_adapter { struct rt_mutex bus_lock; struct rt_mutex mux_lock; + u32 bus_freq_hz; int timeout; /* in jiffies */ int retries; struct device dev; /* the adapter device */ From patchwork Tue Oct 23 09:20:40 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tudor Ambarus X-Patchwork-Id: 988088 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-i2c-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=microchip.com Authentication-Results: ozlabs.org; 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PCL:0; RULEID:(7020095)(4652040)(8989299)(5600074)(711020)(4534185)(4627221)(201703031133081)(201702281549075)(8990200)(2017052603328)(7153060)(7193020); SRVR:BN6PR11MB1524; x-ms-traffictypediagnostic: BN6PR11MB1524: x-microsoft-antispam-prvs: x-exchange-antispam-report-test: UriScan:; x-ms-exchange-senderadcheck: 1 x-exchange-antispam-report-cfa-test: BCL:0; PCL:0; RULEID:(6040522)(2401047)(5005006)(8121501046)(10201501046)(93006095)(93001095)(3002001)(3231355)(944501410)(52105095)(148016)(149066)(150057)(6041310)(201703131423095)(201702281528075)(20161123555045)(201703061421075)(201703061406153)(20161123558120)(20161123564045)(20161123560045)(20161123562045)(201708071742011)(7699051)(76991095); SRVR:BN6PR11MB1524; BCL:0; PCL:0; RULEID:; SRVR:BN6PR11MB1524; x-forefront-prvs: 0834BAF534 x-forefront-antispam-report: SFV:NSPM; SFS:(10009020)(136003)(376002)(346002)(39860400002)(396003)(366004)(189003)(199004)(52116002)(478600001)(26005)(4326008)(316002)(14444005)(86362001)(305945005)(6486002)(6436002)(6512007)(256004)(110136005)(7736002)(72206003)(53936002)(14454004)(25786009)(107886003)(2501003)(97736004)(36756003)(105586002)(66066001)(486006)(106356001)(386003)(11346002)(2906002)(1076002)(476003)(6116002)(6506007)(76176011)(3846002)(5660300001)(446003)(2201001)(5250100002)(102836004)(2616005)(8676002)(99286004)(81166006)(2900100001)(71190400001)(71200400001)(8936002)(217873002)(81156014)(68736007)(186003); DIR:OUT; SFP:1101; SCL:1; SRVR:BN6PR11MB1524; H:BN6PR11MB1842.namprd11.prod.outlook.com; FPR:; SPF:None; LANG:en; PTR:InfoNoRecords; MX:1; A:1; received-spf: None (protection.outlook.com: microchip.com does not designate permitted sender hosts) x-microsoft-antispam-message-info: jpo/bUVDpgoFb0hohf8xEXxvJ9bPT+1HcooeE1ldgpfqwC6PkjbR7l4v8I90sjRdEPd6bUuHESBmCvVydKKBzxBgEKDQJ2eaoSCUKq5xzvKrGN6bPmdBwnVNjeemWISMOdxwfIvXUbbBY6OpoEofxJ19BafQqYNQ6B6gjgEEDzrhZfXN8wEIRdFDHdqEerki6hvd8OvlUx/r0zrWoy9Ced55IKRLzJPOnOlPfWWaVM4IBavds4oB1xlvtFpPV7MiYKpsJzU8YKh1tSlYkLxs/ZFLovnEMBxOOB0Obj010dbcWVxUJyPpRuu8GKgTw8cYnPZb7jLcSIugDpGHrccpsy/59UqkELNGo5x+eGekgLg= spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM MIME-Version: 1.0 X-MS-Exchange-CrossTenant-Network-Message-Id: fdfeb8bc-f91c-4a06-9bdc-08d638c8cd09 X-MS-Exchange-CrossTenant-originalarrivaltime: 23 Oct 2018 09:20:40.6890 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 3f4057f3-b418-4d4e-ba84-d55b4e897d88 X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN6PR11MB1524 X-OriginatorOrg: microchip.com Sender: linux-i2c-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org The clock-frequency property is not mandatory for the i2c buses. If it's not present in the device tree, the buses __usually__ assume it's 100kHZ (see altera, at91, axxia, etc.). Broadcom uses a 375kHZ default clock-frequency, so the default clock frequency varies from bus to bus. There are i2c clients that need to know the bus clock frequency in order to compute their wake token (see atecc508a i2c client). The clock-frequency value has to be propagated to the i2c clients, otherwise, if they will not find the i2c bus clock frequency in the device tree, they will have to make their own assumption of the clock frequency. Spare the i2c clients of making wrong assumptions of the i2c bus clock frequency and provide the bus clock frequency in adapter. Signed-off-by: Tudor Ambarus Acked-by: Ludovic Desroches --- drivers/i2c/busses/i2c-at91.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/i2c/busses/i2c-at91.c b/drivers/i2c/busses/i2c-at91.c index 3f3e8b3bf5ff..9aa0937817ac 100644 --- a/drivers/i2c/busses/i2c-at91.c +++ b/drivers/i2c/busses/i2c-at91.c @@ -1124,6 +1124,7 @@ static int at91_twi_probe(struct platform_device *pdev) dev->adapter.quirks = &at91_twi_quirks; dev->adapter.dev.parent = dev->dev; dev->adapter.nr = pdev->id; + dev->adapter.bus_freq_hz = bus_clk_rate; dev->adapter.timeout = AT91_I2C_TIMEOUT; dev->adapter.dev.of_node = pdev->dev.of_node;