diff options
| author | Tan, Raymond <raymond.tan@intel.com> | 2014-09-03 10:41:38 +0800 |
|---|---|---|
| committer | Wolfram Sang <wsa@the-dreams.de> | 2014-09-29 22:41:17 +0200 |
| commit | 4bcfda09936da647b0a3b49d5dcb3c6c6ebb0395 (patch) | |
| tree | 6a838ea3032bcfb468308597bab573952a88a692 | |
| parent | 8e5f6b2a289c4374456fb785900b0b7445b719e6 (diff) | |
| download | lwn-4bcfda09936da647b0a3b49d5dcb3c6c6ebb0395.tar.gz lwn-4bcfda09936da647b0a3b49d5dcb3c6c6ebb0395.zip | |
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>
| -rw-r--r-- | drivers/i2c/busses/i2c-designware-platdrv.c | 6 | ||||
| -rw-r--r-- | include/linux/platform_data/i2c-designware.h | 21 |
2 files changed, 27 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c index 8193e8eea764..4d6a6b94e2fa 100644 --- a/drivers/i2c/busses/i2c-designware-platdrv.c +++ b/drivers/i2c/busses/i2c-designware-platdrv.c @@ -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 = diff --git a/include/linux/platform_data/i2c-designware.h b/include/linux/platform_data/i2c-designware.h new file mode 100644 index 000000000000..7a61fb27c25b --- /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 |