From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964922AbbCPRBg (ORCPT ); Mon, 16 Mar 2015 13:01:36 -0400 Received: from opensource.wolfsonmicro.com ([80.75.67.52]:55629 "EHLO opensource.wolfsonmicro.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933881AbbCPRB3 (ORCPT ); Mon, 16 Mar 2015 13:01:29 -0400 From: Charles Keepax To: lee.jones@linaro.org, broonie@kernel.org Cc: sameo@linux.intel.com, lgirdwood@gmail.com, patches@opensource.wolfsonmicro.com, linux-kernel@vger.kernel.org Subject: [PATCH 3/5] mfd: wm5110: Add delay before releasing reset line on cold boot Date: Mon, 16 Mar 2015 16:58:42 +0000 Message-Id: <1426525124-12317-3-git-send-email-ckeepax@opensource.wolfsonmicro.com> X-Mailer: git-send-email 1.7.2.5 In-Reply-To: <1426525124-12317-1-git-send-email-ckeepax@opensource.wolfsonmicro.com> References: <1426525124-12317-1-git-send-email-ckeepax@opensource.wolfsonmicro.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On the first boot of the wm5110 it is important the reset line is held for slightly longer to ensure the device starts up well. This patch adds a 5mS delay for this. Signed-off-by: Charles Keepax --- drivers/mfd/arizona-core.c | 9 +++++++++ 1 files changed, 9 insertions(+), 0 deletions(-) diff --git a/drivers/mfd/arizona-core.c b/drivers/mfd/arizona-core.c index 8f61ccf..1ecf9f5 100644 --- a/drivers/mfd/arizona-core.c +++ b/drivers/mfd/arizona-core.c @@ -784,6 +784,15 @@ int arizona_dev_init(struct arizona *arizona) goto err_enable; } + switch (arizona->type) { + case WM5110: + case WM8280: + msleep(5); + break; + default: + break; + } + if (arizona->pdata.reset) { gpio_set_value_cansleep(arizona->pdata.reset, 1); msleep(1); -- 1.7.2.5