spi: Define and use spi_ctrlr structure

1. Define a new structure spi_ctrlr that allows platforms to define
callbacks for spi operations (claim bus, release bus, transfer).
2. Add a new member (pointer to spi_ctrlr structure) in spi_slave
structure which will be initialized by call to spi_setup_slave.
3. Define spi_claim_bus, spi_release_bus and spi_xfer in spi-generic.c
which will make appropriate calls to ctrlr functions.

BUG=chrome-os-partner:59832
BRANCH=None
TEST=Compiles successfully

Change-Id: Icb2326e3aab1e8f4bef53f553f82b3836358c55e
Signed-off-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: https://review.coreboot.org/17684
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

1 files changed, 0 insertions, 15 deletions

diff --git a/src/soc/marvell/bg4cd/spi.c b/src/soc/marvell/bg4cd/spi.c
index 54161bcf33..188a6bd483 100644
--- a/src/soc/marvell/bg4cd/spi.c
+++ b/src/soc/marvell/bg4cd/spi.c
@@ -19,18 +19,3 @@ int spi_setup_slave(unsigned int bus, unsigned int cs, struct spi_slave *slave)
 {
 	return -1;
 }
-
-int spi_claim_bus(const struct spi_slave *slave)
-{
-	return 0;
-}
-
-void spi_release_bus(const struct spi_slave *slave)
-{
-}
-
-int spi_xfer(const struct spi_slave *slave, const void *dout,
-	     size_t out_bytes, void *din, size_t in_bytes)
-{
-	return 0;
-}