From mboxrd@z Thu Jan 1 00:00:00 1970 From: Zhangfei Gao Subject: [PATCH] i2c: designware: add reset interface Date: Tue, 22 Nov 2016 12:41:40 +0800 Message-ID: <1479789700-19532-1-git-send-email-zhangfei.gao@linaro.org> Return-path: Received: from mail-pf0-f175.google.com ([209.85.192.175]:33983 "EHLO mail-pf0-f175.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754871AbcKVEmZ (ORCPT ); Mon, 21 Nov 2016 23:42:25 -0500 Received: by mail-pf0-f175.google.com with SMTP id c4so1825423pfb.1 for ; Mon, 21 Nov 2016 20:42:25 -0800 (PST) Sender: linux-i2c-owner@vger.kernel.org List-Id: linux-i2c@vger.kernel.org To: Wolfram Sang Cc: linux-arm-kernel@lists.infradead.org, linux-i2c@vger.kernel.org, Zhangfei Gao Some platforms like hi3660 need do reset first to allow accessing registers Signed-off-by: Zhangfei Gao --- drivers/i2c/busses/i2c-designware-core.h | 1 + drivers/i2c/busses/i2c-designware-platdrv.c | 5 +++++ 2 files changed, 6 insertions(+) diff --git a/drivers/i2c/busses/i2c-designware-core.h b/drivers/i2c/busses/i2c-designware-core.h index 0d44d2a..94b14fa 100644 --- a/drivers/i2c/busses/i2c-designware-core.h +++ b/drivers/i2c/busses/i2c-designware-core.h @@ -80,6 +80,7 @@ struct dw_i2c_dev { void __iomem *base; struct completion cmd_complete; struct clk *clk; + struct reset_control *rst; u32 (*get_clk_rate_khz) (struct dw_i2c_dev *dev); struct dw_pci_controller *controller; int cmd_err; diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c index 0b42a12..fd80e58 100644 --- a/drivers/i2c/busses/i2c-designware-platdrv.c +++ b/drivers/i2c/busses/i2c-designware-platdrv.c @@ -38,6 +38,7 @@ #include #include #include +#include #include #include #include @@ -176,6 +177,10 @@ static int dw_i2c_plat_probe(struct platform_device *pdev) dev->irq = irq; platform_set_drvdata(pdev, dev); + dev->rst = devm_reset_control_get(&pdev->dev, NULL); + if (!IS_ERR(dev->rst)) + reset_control_reset(dev->rst); + /* fast mode by default because of legacy reasons */ dev->clk_freq = 400000; -- 2.7.4