i2c: designware: add support of platform data to set I2C mode
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 <raymond.tan@intel.com> Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com> Reviewed-by: Hock Leong Kweh <hock.leong.kweh@intel.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
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@ -41,6 +41,7 @@
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#include <linux/io.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <linux/slab.h>
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#include <linux/acpi.h>
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#include <linux/acpi.h>
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#include <linux/platform_data/i2c-designware.h>
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#include "i2c-designware-core.h"
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#include "i2c-designware-core.h"
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static struct i2c_algorithm i2c_dw_algo = {
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static struct i2c_algorithm i2c_dw_algo = {
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@ -122,6 +123,7 @@ static int dw_i2c_probe(struct platform_device *pdev)
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struct dw_i2c_dev *dev;
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struct dw_i2c_dev *dev;
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struct i2c_adapter *adap;
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struct i2c_adapter *adap;
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struct resource *mem;
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struct resource *mem;
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struct dw_i2c_platform_data *pdata;
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int irq, r;
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int irq, r;
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u32 clk_freq;
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u32 clk_freq;
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@ -182,6 +184,10 @@ static int dw_i2c_probe(struct platform_device *pdev)
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dev_err(&pdev->dev, "Only 100kHz and 400kHz supported");
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dev_err(&pdev->dev, "Only 100kHz and 400kHz supported");
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return -EINVAL;
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return -EINVAL;
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}
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}
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} else {
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pdata = dev_get_platdata(&pdev->dev);
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if (pdata)
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clk_freq = pdata->i2c_scl_freq;
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}
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}
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dev->functionality =
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dev->functionality =
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21
include/linux/platform_data/i2c-designware.h
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21
include/linux/platform_data/i2c-designware.h
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@ -0,0 +1,21 @@
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/*
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* Copyright(c) 2014 Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#ifndef I2C_DESIGNWARE_H
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#define I2C_DESIGNWARE_H
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struct dw_i2c_platform_data {
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unsigned int i2c_scl_freq;
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};
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#endif
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