From 6e929acb73fd861c45f2b013a0d64f77b247b124 Mon Sep 17 00:00:00 2001 From: Jes Klinke Date: Tue, 1 Dec 2020 15:21:38 -0800 Subject: mb/google/volteer: ACPI nodes for volteer2_ti50 Unique among the Volteer devices, the volteer2_ti50 variant connects to the TPM via I2C. This CL introduces the proper devicestree declarations for the Linux kernel to recognize that. overridetree.cb is shared between "sub"-variants volteer2 and volteer2_ti50, so both will have two TPM nodes, the I2C being disabled by default. The odd _ti50 variant then has code in variant.c to enable the I2C node and disable the SPI node. BUG=b:173461736 TEST=abuild -t GOOGLE_VOLTEER2{_TI50,} -c max -x Change-Id: I5576a595bbabc34c62b768f8b3439e35ff6bcf7b Signed-off-by: Jes Bodi Klinke Reviewed-on: https://review.coreboot.org/c/coreboot/+/48223 Reviewed-by: Duncan Laurie Tested-by: build bot (Jenkins) --- .../google/volteer/variants/volteer2/variant.c | 33 ++++++++++++++++++++++ 1 file changed, 33 insertions(+) create mode 100644 src/mainboard/google/volteer/variants/volteer2/variant.c (limited to 'src/mainboard/google/volteer/variants/volteer2/variant.c') diff --git a/src/mainboard/google/volteer/variants/volteer2/variant.c b/src/mainboard/google/volteer/variants/volteer2/variant.c new file mode 100644 index 0000000000..057bb8ad65 --- /dev/null +++ b/src/mainboard/google/volteer/variants/volteer2/variant.c @@ -0,0 +1,33 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +#include +#include +#include + +extern struct chip_operations drivers_i2c_tpm_ops; + +static bool match_i2c_tpm(DEVTREE_CONST struct device *dev) +{ + return dev->chip_ops == &drivers_i2c_tpm_ops; +} + +/* + * This function runs only on the volteer_ti50 variant, which has the GSC on a + * reworked I2C bus. + */ +static void devtree_enable_i2c_tpm(void) +{ + struct device *spi_tpm = pcidev_path_on_root(PCH_DEVFN_GSPI0)->link_list->children; + struct device *i2c_tpm = dev_find_matching_device_on_bus( + pcidev_path_on_root(PCH_DEVFN_I2C1)->link_list, match_i2c_tpm); + if (!i2c_tpm || !spi_tpm) + return; + spi_tpm->enabled = 0; + i2c_tpm->enabled = 1; +} + +void variant_devtree_update(void) +{ + if (CONFIG(MAINBOARD_HAS_I2C_TPM_CR50)) + devtree_enable_i2c_tpm(); +} -- cgit v1.2.3