device: Add a new "SPI" device type
Add support for a new "SPI" device type in the devicetree to bind a
device on the SPI bus. Allow device to provide chip select number for
the device as a parameter.
Add spi_bus_operations with operation dev_to_bus which allows SoCs to
define a translation method for converting "struct device" into a unique
SPI bus number.
BUG=chrome-os-partner:59832
BRANCH=None
TEST=Compiles successfully.
Change-Id: I86f09516d3cddd619fef23a4659c9e4eadbcf3fa
Signed-off-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: https://review.coreboot.org/18340
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Tested-by: build bot (Jenkins)
diff --git a/src/include/device/device.h b/src/include/device/device.h
index 47509f7..e21384b 100644
--- a/src/include/device/device.h
+++ b/src/include/device/device.h
@@ -23,6 +23,7 @@
struct i2c_bus_operations;
struct smbus_bus_operations;
struct pnp_mode_ops;
+struct spi_bus_operations;
/* Chip operations */
struct chip_operations {
@@ -64,6 +65,7 @@
#endif
const struct pci_operations *ops_pci;
const struct i2c_bus_operations *ops_i2c_bus;
+ const struct spi_bus_operations *ops_spi_bus;
const struct smbus_bus_operations *ops_smbus_bus;
const struct pci_bus_operations * (*ops_pci_bus)(device_t dev);
const struct pnp_mode_ops *ops_pnp_mode;
diff --git a/src/include/device/path.h b/src/include/device/path.h
index 9d7fb38..849b579 100644
--- a/src/include/device/path.h
+++ b/src/include/device/path.h
@@ -14,6 +14,7 @@
DEVICE_PATH_CPU_BUS,
DEVICE_PATH_IOAPIC,
DEVICE_PATH_GENERIC,
+ DEVICE_PATH_SPI,
/*
* When adding path types to this table, please also update the
@@ -33,7 +34,8 @@
"DEVICE_PATH_CPU", \
"DEVICE_PATH_CPU_BUS", \
"DEVICE_PATH_IOAPIC", \
- "DEVICE_PATH_GENERIC" \
+ "DEVICE_PATH_GENERIC", \
+ "DEVICE_PATH_SPI", \
}
struct domain_path
@@ -58,6 +60,11 @@
unsigned mode_10bit;
};
+struct spi_path
+{
+ unsigned cs;
+};
+
struct apic_path
{
unsigned apic_id;
@@ -107,6 +114,7 @@
struct cpu_path cpu;
struct cpu_bus_path cpu_bus;
struct generic_path generic;
+ struct spi_path spi;
};
};
diff --git a/src/include/device/spi.h b/src/include/device/spi.h
new file mode 100644
index 0000000..4315ebc
--- /dev/null
+++ b/src/include/device/spi.h
@@ -0,0 +1,30 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2017 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef __DEVICE_SPI_H__
+#define __DEVICE_SPI_H__
+
+struct device;
+struct spi_bus_operations {
+ /*
+ * This is a SoC-specific method that can be provided to translate the
+ * 'struct device' for a SPI controller into a unique SPI bus
+ * number. Returns -1 if the bus number for this bus cannot be
+ * determined.
+ */
+ int (*dev_to_bus)(struct device *dev);
+};
+
+#endif /* __DEVICE_SPI_H__ */