#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 = {
static int dw_i2c_acpi_configure(struct platform_device *pdev)
{
struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
- bool fs_mode = dev->master_cfg & DW_IC_CON_SPEED_FAST;
if (!ACPI_HANDLE(&pdev->dev))
return -ENODEV;
* Try to get SDA hold time and *CNT values from an ACPI method if
* it exists for both supported speed modes.
*/
- dw_i2c_acpi_params(pdev, "SSCN", &dev->ss_hcnt, &dev->ss_lcnt,
- fs_mode ? NULL : &dev->sda_hold_time);
+ dw_i2c_acpi_params(pdev, "SSCN", &dev->ss_hcnt, &dev->ss_lcnt, NULL);
dw_i2c_acpi_params(pdev, "FMCN", &dev->fs_hcnt, &dev->fs_lcnt,
- fs_mode ? &dev->sda_hold_time : NULL);
+ &dev->sda_hold_time);
return 0;
}
{ "INT3432", 0 },
{ "INT3433", 0 },
{ "80860F41", 0 },
+ { "808622C1", 0 },
{ }
};
MODULE_DEVICE_TABLE(acpi, dw_i2c_acpi_match);
struct dw_i2c_dev *dev;
struct i2c_adapter *adap;
struct resource *mem;
+ struct dw_i2c_platform_data *pdata;
int irq, r;
+ u32 clk_freq;
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
return PTR_ERR(dev->clk);
clk_prepare_enable(dev->clk);
+ /* fast mode by default because of legacy reasons */
+ clk_freq = 400000;
+
if (pdev->dev.of_node) {
u32 ht = 0;
u32 ic_clk = dev->get_clk_rate_khz(dev);
of_property_read_u32(pdev->dev.of_node,
"i2c-scl-falling-time-ns",
&dev->scl_falling_time);
+
+ of_property_read_u32(pdev->dev.of_node, "clock-frequency",
+ &clk_freq);
+
+ /* Only standard mode at 100kHz and fast mode at 400kHz
+ * are supported.
+ */
+ if (clk_freq != 100000 && clk_freq != 400000) {
+ 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 =
I2C_FUNC_SMBUS_BYTE_DATA |
I2C_FUNC_SMBUS_WORD_DATA |
I2C_FUNC_SMBUS_I2C_BLOCK;
- dev->master_cfg = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE |
- DW_IC_CON_RESTART_EN | DW_IC_CON_SPEED_FAST;
+ if (clk_freq == 100000)
+ dev->master_cfg = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE |
+ DW_IC_CON_RESTART_EN | DW_IC_CON_SPEED_STD;
+ else
+ dev->master_cfg = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE |
+ DW_IC_CON_RESTART_EN | DW_IC_CON_SPEED_FAST;
/* Try first if we can configure the device from ACPI */
r = dw_i2c_acpi_configure(pdev);
adap = &dev->adapter;
i2c_set_adapdata(adap, dev);
adap->owner = THIS_MODULE;
- adap->class = I2C_CLASS_HWMON | I2C_CLASS_DEPRECATED;
+ adap->class = I2C_CLASS_DEPRECATED;
strlcpy(adap->name, "Synopsys DesignWare I2C adapter",
sizeof(adap->name));
adap->algo = &i2c_dw_algo;