linux-kernel - [RFC PATCH v2 08/10] firmware: arm_scmi: Add is_scmi_protocol

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Date:   Thu, 5 Nov 2020 22:21:14 +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 08/10] firmware: arm_scmi: Add is_scmi_protocol_device()

The scmi-virtio transport driver will need to distinguish SCMI protocol
devices from the SCMI instance device in the chan_setup() and
chan_free() ops. Add this internal helper to be able to distinguish the
two.

Signed-off-by: Peter Hilber <peter.hilber@...nsynergy.com>
---
 drivers/firmware/arm_scmi/bus.c    | 5 +++++
 drivers/firmware/arm_scmi/common.h | 2 ++
 2 files changed, 7 insertions(+)

diff --git a/drivers/firmware/arm_scmi/bus.c b/drivers/firmware/arm_scmi/bus.c
index 1377ec76a45d..4f19faafb2c5 100644
--- a/drivers/firmware/arm_scmi/bus.c
+++ b/drivers/firmware/arm_scmi/bus.c
@@ -108,6 +108,11 @@ static struct bus_type scmi_bus_type = {
 	.remove = scmi_dev_remove,
 };
 
+bool is_scmi_protocol_device(struct device *dev)
+{
+	return dev->bus == &scmi_bus_type;
+}
+
 int scmi_driver_register(struct scmi_driver *driver, struct module *owner,
 			 const char *mod_name)
 {
diff --git a/drivers/firmware/arm_scmi/common.h b/drivers/firmware/arm_scmi/common.h
index ec9fd7fce3c7..13c9ac176b23 100644
--- a/drivers/firmware/arm_scmi/common.h
+++ b/drivers/firmware/arm_scmi/common.h
@@ -158,6 +158,8 @@ int scmi_version_get(const struct scmi_handle *h, u8 protocol, u32 *version);
 void scmi_setup_protocol_implemented(const struct scmi_handle *handle,
 				     u8 *prot_imp);
 
+bool is_scmi_protocol_device(struct device *dev);
+
 int scmi_base_protocol_init(struct scmi_handle *h);
 
 int __init scmi_bus_init(void);
-- 
2.25.1