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i2c: designware: Find bus speed from ACPI 

Fast mode is the default speed of i2c-designware which can be overridden
by platform data or by "clock-frequency" device property. Even though
the ACPI 5.1 can pass device properties via _DSD method, shipping systems
define the connection speed between I2C host and each slave in their
I2cSerialBus resources. Which means speed is not defined per bus but per
slave.

As there is now support in i2c-core to find the bus speed from ACPI use
that to set up the bus speed prior registering the I2C adapter.

Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Jarkko Nikula 2016-08-12 17:02:54 +03:00 committed by Wolfram Sang
parent 5853b22d96
commit 10f8e7fb37
1 changed files with 5 additions and 1 deletions
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6
drivers/i2c/busses/i2c-designware-platdrv.c
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@ -157,7 +157,7 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)
struct i2c_adapter *adap;
struct resource *mem;
int irq, r;
u32 ht = 0;
u32 acpi_speed, ht = 0;
irq = platform_get_irq(pdev, 0);
if (irq < 0)
@ -192,6 +192,10 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)
&dev->clk_freq);
}
acpi_speed = i2c_acpi_find_bus_speed(&pdev->dev);
if (acpi_speed)
dev->clk_freq = acpi_speed;
if (has_acpi_companion(&pdev->dev))
dw_i2c_acpi_configure(pdev);