diff options
| author | Mika Westerberg <mika.westerberg@linux.intel.com> | 2016-01-26 15:17:49 +0300 |
|---|---|---|
| committer | Lee Jones <lee.jones@linaro.org> | 2016-03-16 11:50:42 +0300 |
| commit | 0343b2f4e4a52c907d7676ce3159e0b5e7f0301c (patch) | |
| tree | 1ccb8e3327b584e53cc4bd899eccea62bf1303cb /drivers/mfd | |
| parent | 2609e4daaaff930548e35793d46ae079d39fb722 (diff) | |
| download | linux-0343b2f4e4a52c907d7676ce3159e0b5e7f0301c.tar.xz | |
mfd: intel-lpss: Pass I2C configuration via properties on BXT
I2C host controller need to be configured properly in order to meet I2C
timings specified in the I2C protocol specification. Some Intel Broxton
based machines do not have this information in the ACPI namespace (or the
boot firmware does not support ACPI at all) so we use build-in device
properties instead.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Diffstat (limited to 'drivers/mfd')
| -rw-r--r-- | drivers/mfd/intel-lpss-acpi.c | 12 | ||||
| -rw-r--r-- | drivers/mfd/intel-lpss-pci.c | 12 |
2 files changed, 24 insertions, 0 deletions
diff --git a/drivers/mfd/intel-lpss-acpi.c b/drivers/mfd/intel-lpss-acpi.c index 06f00d60be46..5a8d9c766633 100644 --- a/drivers/mfd/intel-lpss-acpi.c +++ b/drivers/mfd/intel-lpss-acpi.c @@ -44,8 +44,20 @@ static const struct intel_lpss_platform_info bxt_info = { .clk_rate = 100000000, }; +static struct property_entry bxt_i2c_properties[] = { + PROPERTY_ENTRY_U32("i2c-sda-hold-time-ns", 42), + PROPERTY_ENTRY_U32("i2c-sda-falling-time-ns", 171), + PROPERTY_ENTRY_U32("i2c-scl-falling-time-ns", 208), + { }, +}; + +static struct property_set bxt_i2c_pset = { + .properties = bxt_i2c_properties, +}; + static const struct intel_lpss_platform_info bxt_i2c_info = { .clk_rate = 133000000, + .pset = &bxt_i2c_pset, }; static const struct acpi_device_id intel_lpss_acpi_ids[] = { diff --git a/drivers/mfd/intel-lpss-pci.c b/drivers/mfd/intel-lpss-pci.c index afc7af92db9e..a19e57118641 100644 --- a/drivers/mfd/intel-lpss-pci.c +++ b/drivers/mfd/intel-lpss-pci.c @@ -107,8 +107,20 @@ static const struct intel_lpss_platform_info bxt_uart_info = { .pset = &uart_pset, }; +static struct property_entry bxt_i2c_properties[] = { + PROPERTY_ENTRY_U32("i2c-sda-hold-time-ns", 42), + PROPERTY_ENTRY_U32("i2c-sda-falling-time-ns", 171), + PROPERTY_ENTRY_U32("i2c-scl-falling-time-ns", 208), + { }, +}; + +static struct property_set bxt_i2c_pset = { + .properties = bxt_i2c_properties, +}; + static const struct intel_lpss_platform_info bxt_i2c_info = { .clk_rate = 133000000, + .pset = &bxt_i2c_pset, }; static const struct pci_device_id intel_lpss_pci_ids[] = { |