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From: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
To: gregkh@linuxfoundation.org
Cc: linux-kernel@vger.kernel.org, alsa-devel@alsa-project.org,
	Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Subject: [PATCH 1/7] slimbus: core: add of_slim_device_get() helper
Date: Wed, 16 May 2018 12:36:36 +0100	[thread overview]
Message-ID: <20180516113642.28136-2-srinivas.kandagatla@linaro.org> (raw)
In-Reply-To: <20180516113642.28136-1-srinivas.kandagatla@linaro.org>

On SLIMBus controllers like Qcom NGD(non ported device), controller
can request logical address once the remote side is powered, having a
helper function like this to explicitly enumerate the bus is helpful.
Also codec drivers which are taking to interface device would need
such a helper too.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
---
 drivers/slimbus/core.c  | 39 +++++++++++++++++++++++++++++++++++++++
 include/linux/slimbus.h |  2 ++
 2 files changed, 41 insertions(+)

diff --git a/drivers/slimbus/core.c b/drivers/slimbus/core.c
index 7ddfc675b131..88248a4ecad9 100644
--- a/drivers/slimbus/core.c
+++ b/drivers/slimbus/core.c
@@ -356,6 +356,45 @@ struct slim_device *slim_get_device(struct slim_controller *ctrl,
 }
 EXPORT_SYMBOL_GPL(slim_get_device);
 
+static int of_slim_match_dev(struct device *dev, void *data)
+{
+	struct device_node *np = data;
+	struct slim_device *sbdev = to_slim_device(dev);
+
+	return (sbdev->dev.of_node == np);
+}
+
+static struct slim_device *of_find_slim_device(struct slim_controller *ctrl,
+					       struct device_node *np)
+{
+	struct slim_device *sbdev;
+	struct device *dev;
+
+	dev = device_find_child(ctrl->dev, np, of_slim_match_dev);
+	if (dev) {
+		sbdev = to_slim_device(dev);
+		return sbdev;
+	}
+
+	return NULL;
+}
+
+/**
+ * of_slim_get_device() - get handle to a device using dt node.
+ *
+ * @ctrl: Controller on which this device will be added/queried
+ * @np: node pointer to device
+ *
+ * Return: pointer to a device if it has already reported. Creates a new
+ * device and returns pointer to it if the device has not yet enumerated.
+ */
+struct slim_device *of_slim_get_device(struct slim_controller *ctrl,
+				       struct device_node *np)
+{
+	return of_find_slim_device(ctrl, np);
+}
+EXPORT_SYMBOL_GPL(of_slim_get_device);
+
 static int slim_device_alloc_laddr(struct slim_device *sbdev,
 				   bool report_present)
 {
diff --git a/include/linux/slimbus.h b/include/linux/slimbus.h
index c36cf121d2cd..efa36a852dc3 100644
--- a/include/linux/slimbus.h
+++ b/include/linux/slimbus.h
@@ -138,6 +138,8 @@ static inline void slim_set_devicedata(struct slim_device *dev, void *data)
 	dev_set_drvdata(&dev->dev, data);
 }
 
+struct slim_device *of_slim_get_device(struct slim_controller *ctrl,
+				       struct device_node *np);
 struct slim_device *slim_get_device(struct slim_controller *ctrl,
 				    struct slim_eaddr *e_addr);
 int slim_get_logical_addr(struct slim_device *sbdev);
-- 
2.16.2

  reply	other threads:[~2018-05-16 11:36 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-16 11:36 [PATCH 0/7] slimbus: fixes and some helpers Srinivas Kandagatla
2018-05-16 11:36 ` Srinivas Kandagatla [this message]
2018-05-16 11:36 ` [PATCH 2/7] slimbus: core: rearrange slim_eaddr structure Srinivas Kandagatla
2018-05-16 11:36 ` [PATCH 3/7] slimbus: core: add need_tid flag to slim_msg_txn Srinivas Kandagatla
2018-05-17  0:38   ` [alsa-devel] " kbuild test robot
2018-05-16 11:36 ` [PATCH 4/7] slimbus: messaging: pass correct wbuf Srinivas Kandagatla
2018-05-16 11:36 ` [PATCH 5/7] slimbus: messaging: remove multiple calls to pm_runtime_mark_last_busy Srinivas Kandagatla
2018-05-16 11:36 ` [PATCH 6/7] slimbus: messaging: add slim_prepare_txn() helper function Srinivas Kandagatla
2018-05-16 11:36 ` [PATCH 7/7] slimbus: messaging: initialize completion correctly Srinivas Kandagatla

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