libstb: add tpm_chip interface

This adds the TPM chip interface for libstb:

- tpm_init(): call drivers' probe to find TPM devices that are
  compatible with them.

- tpm_register_chip(): register a TPM chip which includes pointers to
  the TPM device and TPM driver structures.

- tpm_add_status_property(): add the status device tree property for
  each registered TPM device.

The TPM chip interface is documented in 'libstb/tpm_chip.h' and the tpm device
tree node is documented in 'doc/device-tree/tpm.rst'

Signed-off-by: Claudio Carvalho <cclaudio@linux.vnet.ibm.com>
[stewart@linux.vnet.ibm.com: shuffle unused error path around]
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>

1 files changed, 23 insertions, 0 deletions

diff --git a/libstb/status_codes.h b/libstb/status_codes.h
new file mode 100644
index 0000000..240cd95
--- /dev/null
+++ b/libstb/status_codes.h
@@ -0,0 +1,23 @@
+/* Copyright 2013-2016 IBM Corp.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+ * implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __STB_STATUS_CODES_H
+#define __STB_STATUS_CODES_H
+
+/*  general return codes */
+#define STB_ERROR		-1
+
+#endif /* __STB_STATUS_CODES_H */