From mboxrd@z Thu Jan 1 00:00:00 1970 From: Raymond Tan Subject: [PATCH 1/1] i2c: designware: add support of platform data to set I2C mode Date: Wed, 3 Sep 2014 10:41:38 +0800 Message-ID: <1409712098-13997-2-git-send-email-raymond.tan@intel.com> References: <1409712098-13997-1-git-send-email-raymond.tan@intel.com> Return-path: In-Reply-To: <1409712098-13997-1-git-send-email-raymond.tan-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org> Sender: linux-i2c-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Wolfram Sang Cc: linux-i2c-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Romain Baeriswyl List-Id: linux-i2c@vger.kernel.org From: "Tan, Raymond" Use the platform data to set the clk_freq when there is no DT configuration available. The clk_freq in turn will determine the I2C speed mode. In Quark, there is currently no other configuration mechanism other than board files. Signed-off-by: Raymond Tan Reviewed-by: Mika Westerberg Reviewed-by: Hock Leong Kweh --- drivers/i2c/busses/i2c-designware-platdrv.c | 6 ++++++ include/linux/platform_data/i2c-designware.h | 21 +++++++++++++++++++++ 2 files changed, 27 insertions(+) create mode 100644 include/linux/platform_data/i2c-designware.h diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c index b543fe1..ce3f779 100644 --- a/drivers/i2c/busses/i2c-designware-platdrv.c +++ b/drivers/i2c/busses/i2c-designware-platdrv.c @@ -41,6 +41,7 @@ #include #include #include +#include #include "i2c-designware-core.h" static struct i2c_algorithm i2c_dw_algo = { @@ -121,6 +122,7 @@ static int dw_i2c_probe(struct platform_device *pdev) struct dw_i2c_dev *dev; struct i2c_adapter *adap; struct resource *mem; + struct dw_i2c_platform_data *pdata; int irq, r; u32 clk_freq; @@ -181,6 +183,10 @@ static int dw_i2c_probe(struct platform_device *pdev) dev_err(&pdev->dev, "Only 100kHz and 400kHz supported"); return -EINVAL; } + } else { + pdata = dev_get_platdata(&pdev->dev); + if (pdata) + clk_freq = pdata->i2c_scl_freq; } dev->functionality = diff --git a/include/linux/platform_data/i2c-designware.h b/include/linux/platform_data/i2c-designware.h new file mode 100644 index 0000000..7a61fb2 --- /dev/null +++ b/include/linux/platform_data/i2c-designware.h @@ -0,0 +1,21 @@ +/* + * Copyright(c) 2014 Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ + +#ifndef I2C_DESIGNWARE_H +#define I2C_DESIGNWARE_H + +struct dw_i2c_platform_data { + unsigned int i2c_scl_freq; +}; + +#endif -- 1.7.9.5