linux-kernel - [PATCH AUTOSEL 5.5 281/542] clk: Use parent node pointer during registration if necessary

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Date:   Fri, 14 Feb 2020 10:44:33 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Stephen Boyd <sboyd@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Niklas Cassel <niklas.cassel@...aro.org>,
        Niklas Cassel <nks@...wful.org>,
        Sasha Levin <sashal@...nel.org>, linux-clk@...r.kernel.org
Subject: [PATCH AUTOSEL 5.5 281/542] clk: Use parent node pointer during registration if necessary

From: Stephen Boyd <sboyd@...nel.org>

[ Upstream commit 9011f92622e5ef2d075f45e5fa818776d4feb8c0 ]

Sometimes clk drivers are attached to devices which are children of a
parent device that is connected to a node in DT. This happens when
devices are MFD-ish and the parent device driver mostly registers child
devices to match against drivers placed in their respective subsystem
directories like drivers/clk, drivers/regulator, etc. When the clk
driver calls clk_register() with a device pointer, that struct device
pointer won't have a device_node associated with it because it was
created purely in software as a way to partition logic to a subsystem.

This causes problems for the way we find parent clks for the clks
registered by these child devices because we look at the registering
device's device_node pointer to lookup 'clocks' and 'clock-names'
properties. Let's use the parent device's device_node pointer if the
registering device doesn't have a device_node but the parent does. This
simplifies clk registration code by avoiding the need to assign some
device_node to the device registering the clk.

Cc: Bjorn Andersson <bjorn.andersson@...aro.org>
Reported-by: Niklas Cassel <niklas.cassel@...aro.org>
Signed-off-by: Stephen Boyd <sboyd@...nel.org>
Link: https://lkml.kernel.org/r/20191230190455.141339-1-sboyd@kernel.org
[sboyd@...nel.org: Fixup kernel-doc notation]
Reviewed-by: Niklas Cassel <nks@...wful.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>
Tested-by: Bjorn Andersson <bjorn.andersson@...aro.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/clk/clk.c | 27 +++++++++++++++++++++++++--
 1 file changed, 25 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 53585cfc4b9ba..66f056ac4c156 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -3736,6 +3736,28 @@ __clk_register(struct device *dev, struct device_node *np, struct clk_hw *hw)
 	return ERR_PTR(ret);
 }
 
+/**
+ * dev_or_parent_of_node() - Get device node of @dev or @dev's parent
+ * @dev: Device to get device node of
+ *
+ * Return: device node pointer of @dev, or the device node pointer of
+ * @dev->parent if dev doesn't have a device node, or NULL if neither
+ * @dev or @dev->parent have a device node.
+ */
+static struct device_node *dev_or_parent_of_node(struct device *dev)
+{
+	struct device_node *np;
+
+	if (!dev)
+		return NULL;
+
+	np = dev_of_node(dev);
+	if (!np)
+		np = dev_of_node(dev->parent);
+
+	return np;
+}
+
 /**
  * clk_register - allocate a new clock, register it and return an opaque cookie
  * @dev: device that is registering this clock
@@ -3751,7 +3773,7 @@ __clk_register(struct device *dev, struct device_node *np, struct clk_hw *hw)
  */
 struct clk *clk_register(struct device *dev, struct clk_hw *hw)
 {
-	return __clk_register(dev, dev_of_node(dev), hw);
+	return __clk_register(dev, dev_or_parent_of_node(dev), hw);
 }
 EXPORT_SYMBOL_GPL(clk_register);
 
@@ -3767,7 +3789,8 @@ EXPORT_SYMBOL_GPL(clk_register);
  */
 int clk_hw_register(struct device *dev, struct clk_hw *hw)
 {
-	return PTR_ERR_OR_ZERO(__clk_register(dev, dev_of_node(dev), hw));
+	return PTR_ERR_OR_ZERO(__clk_register(dev, dev_or_parent_of_node(dev),
+			       hw));
 }
 EXPORT_SYMBOL_GPL(clk_hw_register);
 
-- 
2.20.1