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Subject[PATCH v5 10/20] firmware: arm_scmi: probe and initialise all the supported protocols
Date
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>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
---
drivers/firmware/arm_scmi/driver.c | 51 +++++++++++++++++++++++++++++++++++++-
1 file changed, 50 insertions(+), 1 deletion(-)

diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c
index 20d083be474c..11c18ac9816f 100644
--- a/drivers/firmware/arm_scmi/driver.c
+++ b/drivers/firmware/arm_scmi/driver.c
@@ -494,6 +494,21 @@ 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
*
@@ -691,6 +706,23 @@ 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;
@@ -698,7 +730,7 @@ 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)) {
@@ -741,6 +773,23 @@ 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;
}

--
2.7.4
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