From patchwork Mon Dec 10 08:41:23 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tudor Ambarus X-Patchwork-Id: 1010325 X-Patchwork-Delegate: wolfram@the-dreams.de 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="t2AdwB7w"; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 43CxPh3DpNz9s5c for ; Mon, 10 Dec 2018 19:41:28 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726029AbeLJIl0 (ORCPT ); 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Mon, 10 Dec 2018 08:41:23 +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 15.20.1404.026; Mon, 10 Dec 2018 08:41:23 +0000 From: To: CC: , , , , , , Subject: [PATCH v2 2/2] i2c: at91: Save the bus clock frequency in adapter Thread-Topic: [PATCH v2 2/2] i2c: at91: Save the bus clock frequency in adapter Thread-Index: AQHUkGQhSABKlEqSJkG+yDuhgPE2wA== Date: Mon, 10 Dec 2018 08:41:23 +0000 Message-ID: <20181210084111.6938-3-tudor.ambarus@microchip.com> References: <20181210084111.6938-1-tudor.ambarus@microchip.com> In-Reply-To: <20181210084111.6938-1-tudor.ambarus@microchip.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: VI1P190CA0036.EURP190.PROD.OUTLOOK.COM (2603:10a6:802:2b::49) 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:BN6PR11MB1971; H:BN6PR11MB1842.namprd11.prod.outlook.com; FPR:; SPF:None; LANG:en; PTR:InfoNoRecords; A:1; MX:1; received-spf: None (protection.outlook.com: microchip.com does not designate permitted sender hosts) x-microsoft-antispam-message-info: AuwI/STbO+CsIZnwg5Zf/AtHI4fE6awNdCT4ixpyEZslWsfpsZ1PmQPIH2Xt9nS0M4hB+pTNanl01+lbfvTsFZpm5P16g9ACttzu23I/z7ENSynoptddCQknPfV/1CMypO+VLVyVhtfv7QBSDNjtz65YKfYP9MkgWj2rEVze3dVAkOzFXWKDlxnfzfqzKRyr4CsfwQzLqbYr4Rvj0N3hQkc4FuH75hPjAyOmR4gf11/MUxhm8CmVXvNn0B+q0fKNJ6TpK/DV4/r3ZnLYixQGMGFHTeHU982ilTrP37IlF5tYgLeISIBGpyX+TaSHqiG5 spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM MIME-Version: 1.0 X-MS-Exchange-CrossTenant-Network-Message-Id: 32073412-1403-4332-8bb7-08d65e7b43ac X-MS-Exchange-CrossTenant-originalarrivaltime: 10 Dec 2018 08:41:23.2636 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 3f4057f3-b418-4d4e-ba84-d55b4e897d88 X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN6PR11MB1971 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 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 --- v2: no change 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;