diff options
| author |   Jarkko Nikula <jarkko.nikula@linux.intel.com> | 2016-11-10 13:37:20 +0200 |
|---|---|---|
| committer |   Wolfram Sang <wsa@the-dreams.de> | 2016-11-18 02:08:03 +0100 |
| commit | 973652db6f1406e556613b7bb252f1a005005f04 (patch) | |
| tree | 70a1ab1bd7d53c59200e2ab88160e568aca37e98 /drivers/i2c/busses | |
| parent | i2c: designware: Implement support for SMBus block read and write (diff) | |
| download | wireguard-linux-973652db6f1406e556613b7bb252f1a005005f04.tar.xz wireguard-linux-973652db6f1406e556613b7bb252f1a005005f04.zip | |
i2c: designware: Allow reduce bus speed by "clock-frequency" property
Allow more flexibility to bus speed selection. Now if there are I2C
slave connections defined in ACPI the speed of slowest device on the bus
will define the bus speed. However if also "clock-frequency" device
property is defined we should use the slowest of these two.
This is targeted to maker boards where developer may want to connect
slower I2C slave devices to the bus than defined in existing ACPI I2C
slave connections.
Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers/i2c/busses')
| -rw-r--r-- | drivers/i2c/busses/i2c-designware-platdrv.c | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c index 886fb622ca38..7429dfa39440 100644 --- a/drivers/i2c/busses/i2c-designware-platdrv.c +++ b/drivers/i2c/busses/i2c-designware-platdrv.c @@ -176,9 +176,6 @@ static int dw_i2c_plat_probe(struct platform_device *pdev) dev->irq = irq; platform_set_drvdata(pdev, dev); - /* fast mode by default because of legacy reasons */ - dev->clk_freq = 400000; - if (pdata) { dev->clk_freq = pdata->i2c_scl_freq; } else { @@ -193,8 +190,16 @@ static int dw_i2c_plat_probe(struct platform_device *pdev) } acpi_speed = i2c_acpi_find_bus_speed(&pdev->dev); - if (acpi_speed) - dev->clk_freq = acpi_speed; + /* + * Find bus speed from the "clock-frequency" device property, ACPI + * or by using fast mode if neither is set. + */ + if (acpi_speed && dev->clk_freq) + dev->clk_freq = min(dev->clk_freq, acpi_speed); + else if (acpi_speed || dev->clk_freq) + dev->clk_freq = max(dev->clk_freq, acpi_speed); + else + dev->clk_freq = 400000; if (has_acpi_companion(&pdev->dev)) dw_i2c_acpi_configure(pdev); |