Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752939Ab2FRCLk (ORCPT ); Sun, 17 Jun 2012 22:11:40 -0400 Received: from mail-pz0-f46.google.com ([209.85.210.46]:40120 "EHLO mail-pz0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752228Ab2FRCLj (ORCPT ); Sun, 17 Jun 2012 22:11:39 -0400 Message-ID: <1339985488.11918.3.camel@phoenix> Subject: [PATCH RFC] regulator: core: Support table based mapping in regulator_set_voltage_time_sel From: Axel Lin To: linux-kernel@vger.kernel.org Cc: Yadwinder Singh Brar , Liam Girdwood , Mark Brown Date: Mon, 18 Jun 2012 10:11:28 +0800 Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.2.3-0ubuntu6 Content-Transfer-Encoding: 7bit Mime-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2785 Lines: 79 For table based mapping, we can calculate voltage difference by below equation: abs(rdev->desc->volt_table[new_selector] - rdev->desc->volt_table[old_selector]) Thus we can make regulator_set_voltage_time_sel work for table based mapping. regulator_set_voltage_time_sel() only supports linear or table based mapping. In case it is misused, also warn if neither linear nor table based mapping is used with regulator_set_voltage_time_sel(). Signed-off-by: Axel Lin --- drivers/regulator/core.c | 37 +++++++++++++++++++++++++------------ 1 file changed, 25 insertions(+), 12 deletions(-) diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index c9a427b..bf0306f 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -2305,25 +2305,38 @@ EXPORT_SYMBOL_GPL(regulator_set_voltage_time); * Provided with the starting and target voltage selectors, this function * returns time in microseconds required to rise or fall to this new voltage * - * Drivers providing uV_step in their regulator_desc and ramp_delay in - * regulation_constraints can use this as their set_voltage_time_sel() - * operation. + * Drivers providing uV_step or volt_table in their regulator_desc and + * ramp_delay in regulation_constraints can use this as their + * set_voltage_time_sel() operation. */ int regulator_set_voltage_time_sel(struct regulator_dev *rdev, unsigned int old_selector, unsigned int new_selector) { - if (rdev->desc->uV_step) { - if (rdev->constraints->ramp_delay) - return DIV_ROUND_UP(rdev->desc->uV_step * - abs(new_selector - old_selector), - rdev->constraints->ramp_delay * 1000); - if (rdev->desc->ramp_delay) - return DIV_ROUND_UP(rdev->desc->uV_step * - abs(new_selector - old_selector), - rdev->desc->ramp_delay * 1000); + unsigned int ramp_delay = 0; + + if (rdev->constraints->ramp_delay) + ramp_delay = rdev->constraints->ramp_delay; + else if (rdev->desc->ramp_delay) + ramp_delay = rdev->desc->ramp_delay; + + if (ramp_delay == 0) { rdev_warn(rdev, "ramp_delay not set\n"); + return 0; } + + if (rdev->desc->uV_step) { + return DIV_ROUND_UP(rdev->desc->uV_step * + abs(new_selector - old_selector), + ramp_delay * 1000); + } else if (rdev->desc->volt_table) { + return DIV_ROUND_UP(abs(rdev->desc->volt_table[new_selector] - + rdev->desc->volt_table[old_selector]), + ramp_delay * 1000); + } else { + rdev_warn(rdev, "Unsupported voltage mapping settings\n"); + } + return 0; } -- 1.7.9.5 -- 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/