i2c: designware: Add support for Intel Quark X1000
Subsystems (3)
cover i2c: designware: Add support for Intel Quark X1000
From: "Tan, Raymond" <[email protected]>
Hi,
This patch is for enabling support of Intel Quark X1000 i2c controller. The Quark designware i2c controller is registered as a MFD device, and Quark exports a single PCI device with both I2C and GPIO functions.
In Quark, there is currently no other configuration mechanism other than board files to configure the I2C mode for the the controller.
This patch is built upon the changes made by Romain Baeriswyl, titled [PATCH V3 2/2] i2c designware add support of I2C standard mode, at
https://lkml.org/lkml/2014/3/25/135
Tan, Raymond (1):
i2c: designware: add support of platform data to set I2C mode
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
Signature · 1 line
1.7.9.5
PATCH 1/1 i2c: designware: add support of platform data to set I2C mode
From: "Tan, Raymond" <[email protected]>
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.
--- 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
drivers/i2c/busses/i2c-designware-platdrv.c +6 -0
@@ -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 = {
@@ -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 =
include/linux/platform_data/i2c-designware.h new file +21 -0
@@ -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
Signature · 1 line
1.7.9.5
Wolfram Sang
AppliedRe: [PATCH 1/1] i2c: designware: add support of platform data to set I2C mode
Quoted 11 lines · Raymond Tan
From: "Tan, Raymond" <[email protected]>
Use the platform data to set the
clk_freqwhen there is no DT configuration available. Theclk_freqin 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 <[email protected]>Reviewed-by Mika Westerberg <[email protected]>Reviewed-by Hock Leong Kweh <[email protected]>
Applied to for-next, thanks!