linux-kernel - [PATCH v4 2/5] soc: qcom: smd-rpm: Create RPM interconnect proxy child device

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Date:   Thu, 13 Jun 2019 18:13:20 +0300
From:   Georgi Djakov <georgi.djakov@...aro.org>
To:     robh+dt@...nel.org, bjorn.andersson@...aro.org, agross@...nel.org,
        georgi.djakov@...aro.org
Cc:     vkoul@...nel.org, evgreen@...omium.org, daidavid1@...eaurora.org,
        linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: [PATCH v4 2/5] soc: qcom: smd-rpm: Create RPM interconnect proxy child device

Register a platform device to handle the communication of bus bandwidth
requests with the remote processor. The interconnect proxy device is part
of this remote processor (RPM) hardware. Let's create a icc-smd-rpm proxy
child device to represent the bus throughput functionality that is provided
by the RPM.

Signed-off-by: Georgi Djakov <georgi.djakov@...aro.org>
---

v4:
- Return error if platform_device_register_data() fails
- Remove platform_set_drvdata() on the child device.

v3:
- New patch.

 drivers/soc/qcom/smd-rpm.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/soc/qcom/smd-rpm.c b/drivers/soc/qcom/smd-rpm.c
index fa9dd12b5e39..34cdd638a6c1 100644
--- a/drivers/soc/qcom/smd-rpm.c
+++ b/drivers/soc/qcom/smd-rpm.c
@@ -19,12 +19,14 @@
 /**
  * struct qcom_smd_rpm - state of the rpm device driver
  * @rpm_channel:	reference to the smd channel
+ * @icc:		interconnect proxy device
  * @ack:		completion for acks
  * @lock:		mutual exclusion around the send/complete pair
  * @ack_status:		result of the rpm request
  */
 struct qcom_smd_rpm {
 	struct rpmsg_endpoint *rpm_channel;
+	struct platform_device *icc;
 	struct device *dev;
 
 	struct completion ack;
@@ -193,6 +195,7 @@ static int qcom_smd_rpm_callback(struct rpmsg_device *rpdev,
 static int qcom_smd_rpm_probe(struct rpmsg_device *rpdev)
 {
 	struct qcom_smd_rpm *rpm;
+	int ret;
 
 	rpm = devm_kzalloc(&rpdev->dev, sizeof(*rpm), GFP_KERNEL);
 	if (!rpm)
@@ -205,11 +208,23 @@ static int qcom_smd_rpm_probe(struct rpmsg_device *rpdev)
 	rpm->rpm_channel = rpdev->ept;
 	dev_set_drvdata(&rpdev->dev, rpm);
 
-	return of_platform_populate(rpdev->dev.of_node, NULL, NULL, &rpdev->dev);
+	rpm->icc = platform_device_register_data(&rpdev->dev, "icc_smd_rpm", -1,
+						 NULL, 0);
+	if (IS_ERR(rpm->icc))
+		return PTR_ERR(rpm->icc);
+
+	ret = of_platform_populate(rpdev->dev.of_node, NULL, NULL, &rpdev->dev);
+	if (ret)
+		platform_device_unregister(rpm->icc);
+
+	return ret;
 }
 
 static void qcom_smd_rpm_remove(struct rpmsg_device *rpdev)
 {
+	struct qcom_smd_rpm *rpm = dev_get_drvdata(&rpdev->dev);
+
+	platform_device_unregister(rpm->icc);
 	of_platform_depopulate(&rpdev->dev);
 }