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mb/google/sarien: Disable touch by strap pin GPP_B4 

We want to disable touch for non-touch sku. We can use
strap pin GPP_B4 to identify it is connected with touch
or not.

touch sku: GPP_B4 is low
non-touch sku: GPP_B4 is high

BUG=b:131132419
TEST=boot up and check no touch device exist

Signed-off-by: Eric Lai <ericr_lai@compal.corp-partner.google.com>
Change-Id: If6681262c25e4b01e061a8520e38905d40345509
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32438
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Eric Lai 2019-04-24 14:21:04 +08:00 committed by Duncan Laurie
parent d228c1ef32
commit 18060d7d92
2 changed files with 23 additions and 0 deletions
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19
src/drivers/i2c/hid/hid.c
View File

@ -18,6 +18,8 @@
#include <stdint.h>
#include <string.h>
#include "chip.h"
#include <gpio.h>
#include <console/console.h>
#if CONFIG(HAVE_ACPI_TABLES)
static void i2c_hid_fill_dsm(struct device *dev)
@ -60,6 +62,23 @@ static void i2c_hid_enable(struct device *dev)
{
struct drivers_i2c_hid_config *config = dev->chip_info;
if (!config)
return;
/* Check if device is present by reading GPIO */
if (config->generic.device_present_gpio) {
int present = gpio_get(config->generic.device_present_gpio);
present ^= config->generic.device_present_gpio_invert;
printk(BIOS_INFO, "%s is %spresent\n",
dev->chip_ops->name, present ? "" : "not ");
if (!present) {
dev->enabled = 0;
return;
}
}
dev->ops = &i2c_hid_ops;
if (config && config->generic.desc) {

4
src/mainboard/google/sarien/variants/sarien/devicetree.cb
View File

@ -329,6 +329,8 @@ chip soc/intel/cannonlake
register "generic.enable_off_delay_ms" = "100"
register "generic.has_power_resource" = "1"
register "hid_desc_reg_offset" = "0x01"
register "generic.device_present_gpio" = "GPP_B4"
register "generic.device_present_gpio_invert" = "1"
device i2c 10 on end
end
chip drivers/i2c/generic
@ -339,6 +341,8 @@ chip soc/intel/cannonlake
register "enable_gpio" = "ACPI_GPIO_OUTPUT_ACTIVE_HIGH(GPP_E7)"
register "enable_delay_ms" = "5"
register "has_power_resource" = "1"
register "device_present_gpio" = "GPP_B4"
register "device_present_gpio_invert" = "1"
device i2c 34 on end
end
end # I2C #0