[PATCH v6 08/14] firmware: scmi: add a version check against base protocol

[AKASHI Takahiro]

In SCMI base protocol version 2 (0x20000), new interfaces,
BASE_SET_DEVICE_PERMISSIONS/BASE_SET_PROTOCOL_PERMISSIONS/
BASE_RESET_AGENT_CONFIGURATION, were added. Moreover, the api of
BASE_DISCOVER_AGENT was changed to support self-agent discovery.

So the driver expects SCMI firmware support version 2 of base protocol.

Signed-off-by: AKASHI Takahiro <takahiro.aka...@linaro.org>
---
v6
* new commit
---
 drivers/firmware/scmi/base.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/firmware/scmi/base.c b/drivers/firmware/scmi/base.c
index ee84e261945a..1d41a8a98fc6 100644
--- a/drivers/firmware/scmi/base.c
+++ b/drivers/firmware/scmi/base.c
@@ -481,6 +481,7 @@ static int scmi_base_reset_agent_configuration_int(struct 
udevice *dev,
  */
 static int scmi_base_probe(struct udevice *dev)
 {
+       u32 version;
        int ret;
 
        ret = devm_scmi_of_get_channel(dev);
@@ -488,6 +489,13 @@ static int scmi_base_probe(struct udevice *dev)
                dev_err(dev, "get_channel failed\n");
                return ret;
        }
+       ret = scmi_base_protocol_version_int(dev, &version);
+       if (ret) {
+               dev_err(dev, "getting protocol version failed\n");
+               return ret;
+       }
+       if (version < SCMI_BASE_PROTOCOL_VERSION)
+               return -EINVAL;
 
        return ret;
 }
-- 
2.34.1