Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 4bcfda09 authored by Tan, Raymond's avatar Tan, Raymond Committed by Wolfram Sang
Browse files

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: default avatarRaymond Tan <raymond.tan@intel.com>
Reviewed-by: default avatarMika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: default avatarHock Leong Kweh <hock.leong.kweh@intel.com>
Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
parent 8e5f6b2a

drivers/i2c/busses/i2c-designware-platdrv.c

+6 −0
Original line number Diff line number Diff line
@@ -41,6 +41,7 @@ 
#include <linux/io.h>

#include <linux/slab.h>

#include <linux/acpi.h>

#include <linux/platform_data/i2c-designware.h>

#include "i2c-designware-core.h"



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 i2c_adapter *adap;

	struct resource *mem;

	struct dw_i2c_platform_data *pdata;

	int irq, r;

	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");

			return -EINVAL;

		}

	} else {

		pdata = dev_get_platdata(&pdev->dev);

		if (pdata)

			clk_freq = pdata->i2c_scl_freq;

	}



	dev->functionality =

include/linux/platform_data/i2c-designware.h

0 → 100644
+21 −0
Original line number Diff line number Diff line 
/*

 * 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