linux-kernel - [RFC PATCH v2 07/10] firmware: arm_scmi: Add per-device transport private info

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Message-ID: <20201105212116.411422-8-peter.hilber@opensynergy.com>
Date:   Thu, 5 Nov 2020 22:21:13 +0100
From:   Peter Hilber <peter.hilber@...nsynergy.com>
To:     <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>
CC:     Peter Hilber <peter.hilber@...nsynergy.com>,
        Rob Herring <robh+dt@...nel.org>,
        <linux-kernel@...r.kernel.org>, <sudeep.holla@....com>,
        <souvik.chakravarty@....com>, <alex.bennee@...aro.org>,
        <jean-philippe@...aro.org>, <igor.skalkin@...nsynergy.com>,
        <mikhail.golubev@...nsynergy.com>, <anton.yakovlev@...nsynergy.com>
Subject: [RFC PATCH v2 07/10] firmware: arm_scmi: Add per-device transport private info

The scmi-virtio transport will link a supplier device to the arm-scmi
device in the link_supplier() op. The transport should then save a
pointer to the linked device.

To enable this, add a transport private info to the scmi_info. (The
scmi_info is already reachable through the arm-scmi device driver_data.)

Signed-off-by: Peter Hilber <peter.hilber@...nsynergy.com>
---
 drivers/firmware/arm_scmi/common.h |  2 ++
 drivers/firmware/arm_scmi/driver.c | 35 ++++++++++++++++++++++++++++++
 2 files changed, 37 insertions(+)

diff --git a/drivers/firmware/arm_scmi/common.h b/drivers/firmware/arm_scmi/common.h
index 2f55ac71555a..ec9fd7fce3c7 100644
--- a/drivers/firmware/arm_scmi/common.h
+++ b/drivers/firmware/arm_scmi/common.h
@@ -262,6 +262,8 @@ extern const struct scmi_desc scmi_mailbox_desc;
 extern const struct scmi_desc scmi_smc_desc;
 #endif
 
+int scmi_set_transport_info(struct device *dev, void *transport_info);
+void *scmi_get_transport_info(struct device *dev);
 void scmi_rx_callback(struct scmi_chan_info *cinfo, u32 msg_hdr);
 void scmi_free_channel(struct scmi_chan_info *cinfo, struct idr *idr, int id);
 
diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c
index dedc9b3f3e97..244141e45e88 100644
--- a/drivers/firmware/arm_scmi/driver.c
+++ b/drivers/firmware/arm_scmi/driver.c
@@ -84,6 +84,7 @@ struct scmi_xfers_info {
  * @rx_idr: IDR object to map protocol id to Rx channel info pointer
  * @protocols_imp: List of protocols implemented, currently maximum of
  *	MAX_PROTOCOLS_IMP elements allocated by the base protocol
+ * @transport_info: Transport private info
  * @node: List head
  * @users: Number of users of this instance
  */
@@ -97,6 +98,7 @@ struct scmi_info {
 	struct idr tx_idr;
 	struct idr rx_idr;
 	u8 *protocols_imp;
+	void *transport_info;
 	struct list_head node;
 	int users;
 };
@@ -315,6 +317,39 @@ void scmi_rx_callback(struct scmi_chan_info *cinfo, u32 msg_hdr)
 	}
 }
 
+/**
+ * scmi_set_transport_info() - Set transport private info
+ *
+ * @dev: SCMI instance device
+ * @transport_info: transport private info
+ *
+ * Return: 0 on success, otherwise error.
+ */
+int scmi_set_transport_info(struct device *dev, void *transport_info)
+{
+	struct scmi_info *info = dev_get_drvdata(dev);
+
+	if (!info)
+		return -EBADR;
+
+	info->transport_info = transport_info;
+	return 0;
+}
+
+/**
+ * scmi_get_transport_info() - Get transport private info
+ *
+ * @dev: SCMI instance device
+ *
+ * Return: transport private info on success, otherwise NULL.
+ */
+void *scmi_get_transport_info(struct device *dev)
+{
+	struct scmi_info *info = dev_get_drvdata(dev);
+
+	return info ? info->transport_info : NULL;
+}
+
 /**
  * scmi_xfer_put() - Release a transmit message
  *
-- 
2.25.1