firmware: arm_scmi: probe and initialise all the supported protocols

Now that we have basic support for all the protocols in the
specification, let's probe them individually and initialise them.

Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>

diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c
index 49875cd6836506bb46ff8b2b1e444246ee84f492..f242b2e7c4b11d223f234c02b27ade36e96e37e0 100644 (file)
--- a/drivers/firmware/arm_scmi/driver.c
+++ b/drivers/firmware/arm_scmi/driver.c
@@ -466,6 +466,21 @@ void scmi_setup_protocol_implemented(const struct scmi_handle *handle,
        info->protocols_imp = prot_imp;
 }
 
+static bool
+scmi_is_protocol_implemented(const struct scmi_handle *handle, u8 prot_id)
+{
+       int i;
+       struct scmi_info *info = handle_to_scmi_info(handle);
+
+       if (!info->protocols_imp)
+               return false;
+
+       for (i = 0; i < MAX_PROTOCOLS_IMP; i++)
+               if (info->protocols_imp[i] == prot_id)
+                       return true;
+       return false;
+}
+
 /**
  * scmi_handle_get() - Get the  SCMI handle for a device
  *
@@ -661,6 +676,23 @@ static inline int scmi_mbox_chan_setup(struct scmi_info *info)
        return 0;
 }
 
+static inline void
+scmi_create_protocol_device(struct device_node *np, struct scmi_info *info,
+                           int prot_id)
+{
+       struct scmi_device *sdev;
+
+       sdev = scmi_device_create(np, info->dev, prot_id);
+       if (!sdev) {
+               dev_err(info->dev, "failed to create %d protocol device\n",
+                       prot_id);
+               return;
+       }
+
+       /* setup handle now as the transport is ready */
+       scmi_set_handle(sdev);
+}
+
 static int scmi_probe(struct platform_device *pdev)
 {
        int ret;
@@ -668,7 +700,7 @@ static int scmi_probe(struct platform_device *pdev)
        const struct scmi_desc *desc;
        struct scmi_info *info;
        struct device *dev = &pdev->dev;
-       struct device_node *np = dev->of_node;
+       struct device_node *child, *np = dev->of_node;
 
        /* Only mailbox method supported, check for the presence of one */
        if (scmi_mailbox_check(np)) {
@@ -711,6 +743,23 @@ static int scmi_probe(struct platform_device *pdev)
        list_add_tail(&info->node, &scmi_list);
        mutex_unlock(&scmi_list_mutex);
 
+       for_each_available_child_of_node(np, child) {
+               u32 prot_id;
+
+               if (of_property_read_u32(child, "reg", &prot_id))
+                       continue;
+
+               prot_id &= MSG_PROTOCOL_ID_MASK;
+
+               if (!scmi_is_protocol_implemented(handle, prot_id)) {
+                       dev_err(dev, "SCMI protocol %d not implemented\n",
+                               prot_id);
+                       continue;
+               }
+
+               scmi_create_protocol_device(child, info, prot_id);
+       }
+
        return 0;
 }