Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752772AbbG3NKs (ORCPT ); Thu, 30 Jul 2015 09:10:48 -0400 Received: from mail-pa0-f48.google.com ([209.85.220.48]:34393 "EHLO mail-pa0-f48.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751503AbbG3NKr (ORCPT ); Thu, 30 Jul 2015 09:10:47 -0400 Message-ID: <1438261841.9954.6.camel@ingics.com> Subject: regulator: Question about the buck_volt_range and MT6311_MAX_UV setting From: Axel Lin To: Henry Chen Cc: Mark Brown , Javier Martinez Canillas , Liam Girdwood , linux-kernel@vger.kernel.org Date: Thu, 30 Jul 2015 21:10:41 +0800 Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.12.10-0ubuntu1~14.10.1 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 698 Lines: 23 Hi Henry, Seems something wrong in either buck_volt_range or MT6311_MAX_UV setting. .n_voltages = (MT6311_MAX_UV - MT6311_MIN_UV) / MT6311_STEP_UV + 1 (1400000 - 600000) / 6250 + 1 = 129 So .n_voltages = 129. >From the buck_volt_range: The linear range has min_sel: 0, max_sel: 0x7f (0 ~ 127, so 128 selector in this range) And the max voltage is 600000 + 0x7f * 6250 = 1393750 I don't have the datasheet, so can you double check this? Thank, Axel -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/