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Subject[PATCH v4 09/16] firmware: arm_scmi: Add optional link_supplier() transport op
Date
From: Peter Hilber <peter.hilber@opensynergy.com>

For the scmi-virtio transport, it might not be possible to refer to the
proper virtio device at device tree build time. Therefore, add an op
which will allow scmi-virtio to dynamically link to the proper virtio
device during probe.

Signed-off-by: Peter Hilber <peter.hilber@opensynergy.com>
---
drivers/firmware/arm_scmi/common.h | 2 ++
drivers/firmware/arm_scmi/driver.c | 6 ++++++
2 files changed, 8 insertions(+)

diff --git a/drivers/firmware/arm_scmi/common.h b/drivers/firmware/arm_scmi/common.h
index 6b8d388fcf74..a31194b3000a 100644
--- a/drivers/firmware/arm_scmi/common.h
+++ b/drivers/firmware/arm_scmi/common.h
@@ -316,6 +316,7 @@ struct scmi_chan_info {
/**
* struct scmi_transport_ops - Structure representing a SCMI transport ops
*
+ * @link_supplier: Optional callback to add link to a supplier device
* @chan_available: Callback to check if channel is available or not
* @chan_setup: Callback to allocate and setup a channel
* @chan_free: Callback to free a channel
@@ -330,6 +331,7 @@ struct scmi_chan_info {
* @poll_done: Callback to poll transfer status
*/
struct scmi_transport_ops {
+ int (*link_supplier)(struct device *dev);
bool (*chan_available)(struct device *dev, int idx);
int (*chan_setup)(struct scmi_chan_info *cinfo, struct device *dev,
bool tx);
diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c
index 041a9e008cbf..69fa97250d98 100644
--- a/drivers/firmware/arm_scmi/driver.c
+++ b/drivers/firmware/arm_scmi/driver.c
@@ -1757,6 +1757,12 @@ static int scmi_probe(struct platform_device *pdev)
handle->devm_protocol_get = scmi_devm_protocol_get;
handle->devm_protocol_put = scmi_devm_protocol_put;

+ if (desc->ops->link_supplier) {
+ ret = desc->ops->link_supplier(dev);
+ if (ret)
+ return ret;
+ }
+
ret = scmi_txrx_setup(info, dev, SCMI_PROTOCOL_BASE);
if (ret)
return ret;
--
2.17.1
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