drivers/i2c/designware: reduce API complication for bus config

Right now dw_i2c_get_soc_cfg() is expecting the SoC to implement
that callback for obtaining the bus config. However, we're currently
forcing another parameter of struct device so one can do the lookup.
This works for Intel-based systems since the struct device was needed
to program the BAR, etc. However, from an API standpoint, it just
complicates matters by needing to obtain the struct device. The SoC
already has knowlege of its own devices so it can get the config
itself by bus number. Therefore, remove that contraint from the API.

BUG=b:70232394

Change-Id: Id8558f5deedda0963a46a532a7bf984e168fb270
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/23420
Reviewed-by: Subrata Banik <subrata.banik@intel.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/src/soc/intel/apollolake/i2c.c b/src/soc/intel/apollolake/i2c.c
index bcaf740fe6..3df333c869 100644
--- a/src/soc/intel/apollolake/i2c.c
+++ b/src/soc/intel/apollolake/i2c.c
@@ -21,10 +21,11 @@
 #include <soc/pci_devs.h>
 #include "chip.h"
 
-const struct dw_i2c_bus_config *dw_i2c_get_soc_cfg(unsigned int bus,
-					const struct device *dev)
+const struct dw_i2c_bus_config *dw_i2c_get_soc_cfg(unsigned int bus)
 {
 	const struct soc_intel_apollolake_config *config;
+	const struct device *dev = dev_find_slot(0, SA_DEVFN_ROOT);
+
 	if (!dev || !dev->chip_info) {
 		printk(BIOS_ERR, "%s: Could not find SoC devicetree config!\n",
 		       __func__);