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i2c: designware: add support of platform data to set I2C mode

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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>
This commit is contained in:
Tan, Raymond 2014-09-03 10:41:38 +08:00 • committed by Wolfram Sang
commit 4bcfda0993
2 changed files with 27 additions and 0 deletions
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6
drivers/i2c/busses/i2c-designware-platdrv.c
View file

@ -41,6 +41,7 @@
#include <linux/io.h> #include <linux/io.h>
#include <linux/slab.h> #include <linux/slab.h>
#include <linux/acpi.h> #include <linux/acpi.h>
#include <linux/platform_data/i2c-designware.h>
#include "i2c-designware-core.h" #include "i2c-designware-core.h"
static struct i2c_algorithm i2c_dw_algo = { static struct i2c_algorithm i2c_dw_algo = {
@ -122,6 +123,7 @@ static int dw_i2c_probe(struct platform_device *pdev)
struct dw_i2c_dev *dev; struct dw_i2c_dev *dev;
struct i2c_adapter *adap; struct i2c_adapter *adap;
struct resource *mem; struct resource *mem;
struct dw_i2c_platform_data *pdata;
int irq, r; int irq, r;
u32 clk_freq; u32 clk_freq;
@ -182,6 +184,10 @@ static int dw_i2c_probe(struct platform_device *pdev)
dev_err(&pdev->dev, "Only 100kHz and 400kHz supported"); dev_err(&pdev->dev, "Only 100kHz and 400kHz supported");
return -EINVAL; return -EINVAL;
} }
} else {
pdata = dev_get_platdata(&pdev->dev);
if (pdata)
clk_freq = pdata->i2c_scl_freq;
} }
dev->functionality = dev->functionality =

21
include/linux/platform_data/i2c-designware.h Normal file
View file

@ -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