linux-kernel - [PATCH v3 2/9] firmware: arm_scmi: Simplify chan

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Message-Id: <20220903183042.3913053-3-cristian.marussi@arm.com>
Date:   Sat,  3 Sep 2022 19:30:35 +0100
From:   Cristian Marussi <cristian.marussi@....com>
To:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:     sudeep.holla@....com, james.quinlan@...adcom.com,
        Jonathan.Cameron@...wei.com, f.fainelli@...il.com,
        etienne.carriere@...aro.org, vincent.guittot@...aro.org,
        souvik.chakravarty@....com, wleavitt@...vell.com,
        peter.hilber@...nsynergy.com, nicola.mazzucato@....com,
        tarek.el-sherbiny@....com, cristian.marussi@....com
Subject: [PATCH v3 2/9] firmware: arm_scmi: Simplify chan_available transport operation

SCMI transport operation .chan_available determines in a transport-specific
way if an SCMI channel is still available and to be configured: such
information is derived analyzing bits of DT in a transport specific way;
al it needs is a DT node to operate upon, not necessarily a full blown
device.

Fix to receive in input a reference to adevice_node instead of a device
carrying a pointer to such device_node.

Signed-off-by: Cristian Marussi <cristian.marussi@....com>
---
 drivers/firmware/arm_scmi/common.h  | 2 +-
 drivers/firmware/arm_scmi/driver.c  | 2 +-
 drivers/firmware/arm_scmi/mailbox.c | 4 ++--
 drivers/firmware/arm_scmi/optee.c   | 4 ++--
 drivers/firmware/arm_scmi/smc.c     | 4 ++--
 drivers/firmware/arm_scmi/virtio.c  | 2 +-
 6 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/firmware/arm_scmi/common.h b/drivers/firmware/arm_scmi/common.h
index 61aba7447c32..096b66442d84 100644
--- a/drivers/firmware/arm_scmi/common.h
+++ b/drivers/firmware/arm_scmi/common.h
@@ -150,7 +150,7 @@ struct scmi_chan_info {
  */
 struct scmi_transport_ops {
 	int (*link_supplier)(struct device *dev);
-	bool (*chan_available)(struct device *dev, int idx);
+	bool (*chan_available)(struct device_node *of_node, int idx);
 	int (*chan_setup)(struct scmi_chan_info *cinfo, struct device *dev,
 			  bool tx);
 	int (*chan_free)(int id, void *p, void *data);
diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c
index e5193da2ce09..62e02b6475ff 100644
--- a/drivers/firmware/arm_scmi/driver.c
+++ b/drivers/firmware/arm_scmi/driver.c
@@ -2035,7 +2035,7 @@ static int scmi_chan_setup(struct scmi_info *info, struct device *dev,
 	if (cinfo)
 		return 0;
 
-	if (!info->desc->ops->chan_available(dev, idx)) {
+	if (!info->desc->ops->chan_available(dev->of_node, idx)) {
 		cinfo = idr_find(idr, SCMI_PROTOCOL_BASE);
 		if (unlikely(!cinfo)) /* Possible only if platform has no Rx */
 			return -EINVAL;
diff --git a/drivers/firmware/arm_scmi/mailbox.c b/drivers/firmware/arm_scmi/mailbox.c
index 08ff4d110beb..ed7e66788134 100644
--- a/drivers/firmware/arm_scmi/mailbox.c
+++ b/drivers/firmware/arm_scmi/mailbox.c
@@ -46,9 +46,9 @@ static void rx_callback(struct mbox_client *cl, void *m)
 	scmi_rx_callback(smbox->cinfo, shmem_read_header(smbox->shmem), NULL);
 }
 
-static bool mailbox_chan_available(struct device *dev, int idx)
+static bool mailbox_chan_available(struct device_node *of_node, int idx)
 {
-	return !of_parse_phandle_with_args(dev->of_node, "mboxes",
+	return !of_parse_phandle_with_args(of_node, "mboxes",
 					   "#mbox-cells", idx, NULL);
 }
 
diff --git a/drivers/firmware/arm_scmi/optee.c b/drivers/firmware/arm_scmi/optee.c
index f42dad997ac9..59e688767af2 100644
--- a/drivers/firmware/arm_scmi/optee.c
+++ b/drivers/firmware/arm_scmi/optee.c
@@ -328,11 +328,11 @@ static int scmi_optee_link_supplier(struct device *dev)
 	return 0;
 }
 
-static bool scmi_optee_chan_available(struct device *dev, int idx)
+static bool scmi_optee_chan_available(struct device_node *of_node, int idx)
 {
 	u32 channel_id;
 
-	return !of_property_read_u32_index(dev->of_node, "linaro,optee-channel-id",
+	return !of_property_read_u32_index(of_node, "linaro,optee-channel-id",
 					   idx, &channel_id);
 }
 
diff --git a/drivers/firmware/arm_scmi/smc.c b/drivers/firmware/arm_scmi/smc.c
index 745acfdd0b3d..0e21bd01348b 100644
--- a/drivers/firmware/arm_scmi/smc.c
+++ b/drivers/firmware/arm_scmi/smc.c
@@ -52,9 +52,9 @@ static irqreturn_t smc_msg_done_isr(int irq, void *data)
 	return IRQ_HANDLED;
 }
 
-static bool smc_chan_available(struct device *dev, int idx)
+static bool smc_chan_available(struct device_node *of_node, int idx)
 {
-	struct device_node *np = of_parse_phandle(dev->of_node, "shmem", 0);
+	struct device_node *np = of_parse_phandle(of_node, "shmem", 0);
 	if (!np)
 		return false;
 
diff --git a/drivers/firmware/arm_scmi/virtio.c b/drivers/firmware/arm_scmi/virtio.c
index 14709dbc96a1..e0c92037a9e6 100644
--- a/drivers/firmware/arm_scmi/virtio.c
+++ b/drivers/firmware/arm_scmi/virtio.c
@@ -392,7 +392,7 @@ static int virtio_link_supplier(struct device *dev)
 	return 0;
 }
 
-static bool virtio_chan_available(struct device *dev, int idx)
+static bool virtio_chan_available(struct device_node *of_node, int idx)
 {
 	struct scmi_vio_channel *channels, *vioch = NULL;
 
-- 
2.32.0