linux-kernel - [PATCH 1/2] reset: Add API to count number of reset available with device

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Message-Id: <1487741048-24659-1-git-send-email-vivek.gautam@codeaurora.org>
Date:   Wed, 22 Feb 2017 10:54:07 +0530
From:   Vivek Gautam <vivek.gautam@...eaurora.org>
To:     balbi@...nel.org, p.zabel@...gutronix.de
Cc:     gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        Vivek Gautam <vivek.gautam@...eaurora.org>
Subject: [PATCH 1/2] reset: Add API to count number of reset available with device

Count number of reset phandles available with the device node
to know the resets a given device has.

Cc: Philipp Zabel <p.zabel@...gutronix.de>
Signed-off-by: Vivek Gautam <vivek.gautam@...eaurora.org>
---

Based on torvald's master branch.

 include/linux/reset.h | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/include/linux/reset.h b/include/linux/reset.h
index 5daff15722d3..88f63a640153 100644
--- a/include/linux/reset.h
+++ b/include/linux/reset.h
@@ -2,6 +2,7 @@
 #define _LINUX_RESET_H_
 
 #include <linux/device.h>
+#include <linux/of.h>
 
 struct reset_control;
 
@@ -234,6 +235,21 @@ static inline struct reset_control *of_reset_control_get_shared_by_index(
 }
 
 /**
+ * of_reset_control_get_count - Count number of resets available with a device
+ * @node: device to be reset by the controller
+ */
+static inline unsigned int of_reset_control_get_count(struct device_node *node)
+{
+	int count;
+
+	count = of_count_phandle_with_args(node, "resets", "#reset-cells");
+	if (count < 0)
+		return 0;
+
+	return count;
+}
+
+/**
  * devm_reset_control_get_exclusive - resource managed
  *                                    reset_control_get_exclusive()
  * @dev: device to be reset by the controller
-- 
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