From patchwork Wed Jun 25 19:03:28 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Javier Martinez Canillas X-Patchwork-Id: 4423661 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 8B7B5BEEAA for ; Wed, 25 Jun 2014 19:07:37 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id B910F2038C for ; Wed, 25 Jun 2014 19:07:36 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id E408C201F4 for ; Wed, 25 Jun 2014 19:07:35 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1WzsVT-0001tY-QM; Wed, 25 Jun 2014 19:05:19 +0000 Received: from bhuna.collabora.co.uk ([93.93.135.160]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1WzsUj-0000H8-Sk for linux-arm-kernel@lists.infradead.org; Wed, 25 Jun 2014 19:04:34 +0000 Received: from [127.0.0.1] (localhost [127.0.0.1]) (Authenticated sender: javier) with ESMTPSA id 9F6F86026D7 From: Javier Martinez Canillas To: Lee Jones Subject: [PATCH v4 04/14] clk: max77686: Improve Maxim 77686 PMIC clocks binding Date: Wed, 25 Jun 2014 21:03:28 +0200 Message-Id: <1403723019-6212-5-git-send-email-javier.martinez@collabora.co.uk> X-Mailer: git-send-email 2.0.0.rc2 In-Reply-To: <1403723019-6212-1-git-send-email-javier.martinez@collabora.co.uk> References: <1403723019-6212-1-git-send-email-javier.martinez@collabora.co.uk> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140625_120434_111431_2620DDE3 X-CRM114-Status: GOOD ( 10.82 ) X-Spam-Score: -0.0 (/) Cc: Alessandro Zummo , Krzysztof Kozlowski , Kukjin Kim , Mike Turquette , Samuel Ortiz , Tomeu Vizoso , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Liam Girdwood , Doug Anderson , linux-samsung-soc@vger.kernel.org, Sjoerd Simons , Mark Brown , Olof Johansson , Javier Martinez Canillas , linux-arm-kernel@lists.infradead.org, Daniel Stone X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Like most clock drivers, the Maxim 77686 PMIC clock binding follows the convention that the "#clock-cells" property is used to specify the number of cells in a clock provider. But the binding document is not clear enough that it shall be set to 1 since the PMIC support multiple clocks outputs. Also, explain that the clocks identifiers are defined in a header file that can be included by Device Tree source with client nodes to avoid using magic numbers. Signed-off-by: Javier Martinez Canillas Reviewed-by: Krzysztof Kozlowski Reviewed-by: Doug Anderson --- Changes since v3: - Don't change clock-names property to make clear that it's the consumer clock name and should not match the producer clock. Suggested by Doug Anderson. Documentation/devicetree/bindings/clock/maxim,max77686.txt | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/Documentation/devicetree/bindings/clock/maxim,max77686.txt b/Documentation/devicetree/bindings/clock/maxim,max77686.txt index 96ce71b..48e00bb 100644 --- a/Documentation/devicetree/bindings/clock/maxim,max77686.txt +++ b/Documentation/devicetree/bindings/clock/maxim,max77686.txt @@ -9,13 +9,18 @@ The MAX77686 contains three 32.768khz clock outputs that can be controlled Following properties should be presend in main device node of the MFD chip. Required properties: -- #clock-cells: simple one-cell clock specifier format is used, where the - only cell is used as an index of the clock inside the provider. Following - indices are allowed: + +- #clock-cells: from common clock binding; shall be set to 1. + +Each clock is assigned an identifier and client nodes can use this identifier +to specify the clock which they consume. Following indices are allowed: - 0: 32khz_ap clock, - 1: 32khz_cp clock, - 2: 32khz_pmic clock. +Clocks are defined as preprocessor macros in dt-bindings/clock/maxim,max77686.h +header and can be used in device tree sources. + Example: Node of the MFD chip max77686: max77686@09 { @@ -34,5 +39,5 @@ Example: Clock consumer node compatible = "bar,foo"; /* ... */ clock-names = "my-clock"; - clocks = <&max77686 2>; + clocks = <&max77686 MAX77686_CLK_PMIC>; };