Commit 0343b2f4 authored by Mika Westerberg's avatar Mika Westerberg Committed by Lee Jones
Browse files

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: default avatarMika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
parent 2609e4da

drivers/mfd/intel-lpss-acpi.c

+12 −0
Original line number Diff line number Diff line
@@ -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[] = {

drivers/mfd/intel-lpss-pci.c

+12 −0
Original line number Diff line number Diff line
@@ -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[] = {

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