From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753345AbbK3KMh (ORCPT ); Mon, 30 Nov 2015 05:12:37 -0500 Received: from mail-pa0-f43.google.com ([209.85.220.43]:35627 "EHLO mail-pa0-f43.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751816AbbK3KMf (ORCPT ); Mon, 30 Nov 2015 05:12:35 -0500 From: Daniel Kurtz Cc: Daniel Kurtz , Liam Girdwood , Mark Brown , Matthias Brugger , linux-kernel@vger.kernel.org (open list:VOLTAGE AND CURRENT REGULATOR FRAMEWORK), linux-arm-kernel@lists.infradead.org (moderated list:ARM/Mediatek SoC support), linux-mediatek@lists.infradead.org (moderated list:ARM/Mediatek SoC support) Subject: [PATCH] cpufreq: mediatek: Use REGCACHE_RBTREE Date: Mon, 30 Nov 2015 18:12:18 +0800 Message-Id: <1448878338-28496-1-git-send-email-djkurtz@chromium.org> X-Mailer: git-send-email 2.6.0.rc2.230.g3dd15c0 To: unlisted-recipients:; (no To-header on input) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This regulator is on a slow i2c bus. Register accesses are very simple, they all either enable/disable a regulator channel, or select a new voltage level. Thus, reading registers from the device will always return what was last written. Therefore we can save a lot of time when reading registers by using a regmap_cache. Since the register map is relatively large, but we only ever access a few of them, we use an RBTREE cache. Signed-off-by: Daniel Kurtz --- drivers/regulator/mt6311-regulator.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/regulator/mt6311-regulator.c b/drivers/regulator/mt6311-regulator.c index 02c4e5f..0495716 100644 --- a/drivers/regulator/mt6311-regulator.c +++ b/drivers/regulator/mt6311-regulator.c @@ -30,6 +30,7 @@ static const struct regmap_config mt6311_regmap_config = { .reg_bits = 8, .val_bits = 8, .max_register = MT6311_FQMTR_CON4, + .cache_type = REGCACHE_RBTREE, }; /* Default limits measured in millivolts and milliamps */ -- 2.6.0.rc2.230.g3dd15c0