From patchwork Fri Dec 7 11:29:59 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tudor Ambarus X-Patchwork-Id: 1009368 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="l1Od9y5m"; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 43B9Hn4WJYz9s9G for ; Fri, 7 Dec 2018 22:30:13 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726021AbeLGLaH (ORCPT ); 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Fri, 7 Dec 2018 11:29:59 +0000 Received: from BN6PR11MB1842.namprd11.prod.outlook.com ([fe80::d88c:1d67:5fb0:12ae]) by BN6PR11MB1842.namprd11.prod.outlook.com ([fe80::d88c:1d67:5fb0:12ae%2]) with mapi id 15.20.1404.021; Fri, 7 Dec 2018 11:29:59 +0000 From: To: CC: , , , , , , , Subject: [2nd RESEND PATCH 2/2] i2c: at91: Save the bus clock frequency in adapter Thread-Topic: [2nd RESEND PATCH 2/2] i2c: at91: Save the bus clock frequency in adapter Thread-Index: AQHUjiAwvr3DWjad40q+nnl2R6rcoA== Date: Fri, 7 Dec 2018 11:29:59 +0000 Message-ID: <20181207112939.15791-3-tudor.ambarus@microchip.com> References: <20181207112939.15791-1-tudor.ambarus@microchip.com> In-Reply-To: <20181207112939.15791-1-tudor.ambarus@microchip.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: VI1PR0202CA0007.eurprd02.prod.outlook.com (2603:10a6:803:14::20) 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:BN6PR11MB1395; 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: qci6HnkLSrS5mZ+1hhFVar4pivwJQi7QMgZPLylPVSPrtW7Nr0DG0jVM+KYG9fe2bhmjM/gAK3EP/PnokApau7VM3SLOROrm+QRE9Ea7aMCSCXde8aUYI9FXn7VeALOaaVDAS1doVp3lm1o28sYjulqKdnuIvNqkXEL45EISKjHQGO/PqM2RBrPqxDD3CHxW6AN4slIjhzxkrT2YWhK5OxM/YHoTzgz5CwlxZFLbl4jGCMv0yMm+rdT3mIw5bgVUfzRU9NrKjWrSShX4t5vdQ8q8S/99Y5kEvNPGd1VUZzTDYB6fqstT8/12fKRsy8gac3QUq+mVsGsctQCMYirY4zQyjEiv2oKZCRuZwmc7pm8= spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM MIME-Version: 1.0 X-MS-Exchange-CrossTenant-Network-Message-Id: f3cead92-c8e9-4cb3-8fd5-08d65c375262 X-MS-Exchange-CrossTenant-originalarrivaltime: 07 Dec 2018 11:29:59.7924 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 3f4057f3-b418-4d4e-ba84-d55b4e897d88 X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN6PR11MB1395 X-OriginatorOrg: microchip.com Sender: linux-i2c-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org From: "Tudor.Ambarus@microchip.com" 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;