linux-kernel - [RFC 07/15] clk: add DT parsing function

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Message-id: <1418226513-14105-8-git-send-email-a.hajda@samsung.com>
Date:	Wed, 10 Dec 2014 16:48:25 +0100
From:	Andrzej Hajda <a.hajda@...sung.com>
To:	linux-kernel@...r.kernel.org (open list)
Cc:	Andrzej Hajda <a.hajda@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Mike Turquette <mturquette@...aro.org>,
	Russell King <linux@....linux.org.uk>,
	Linus Walleij <linus.walleij@...aro.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Thierry Reding <thierry.reding@...il.com>,
	Inki Dae <inki.dae@...sung.com>,
	Kishon Vijay Abraham I <kishon@...com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	linux-arm-kernel@...ts.infradead.org (moderated list:ARM/CLKDEV SUPPORT),
	linux-gpio@...r.kernel.org (open list:GPIO SUBSYSTEM),
	dri-devel@...ts.freedesktop.org (open list:DRM PANEL DRIVERS),
	linux-samsung-soc@...r.kernel.org (moderated list:ARM/S5P EXYNOS AR...),
	devicetree@...r.kernel.org (open list:OPEN FIRMWARE AND...),
	boris.brezillon@...e-electrons.com
Subject: [RFC 07/15] clk: add DT parsing function

The patch adds function for parsing Device Tree to get
clock specifier. The function could be ultimately used
by clock core.

Signed-off-by: Andrzej Hajda <a.hajda@...sung.com>
---
 drivers/clk/clkdev.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/drivers/clk/clkdev.c b/drivers/clk/clkdev.c
index da4bda8..bd22750 100644
--- a/drivers/clk/clkdev.c
+++ b/drivers/clk/clkdev.c
@@ -120,6 +120,29 @@ struct clk *of_clk_get_by_name(struct device_node *np, const char *name)
 	return clk;
 }
 EXPORT_SYMBOL(of_clk_get_by_name);
+
+static int of_get_clock_spec(struct device *dev, const char *name,
+		struct of_phandle_args *spec)
+{
+	struct device_node *np = dev->of_node;
+
+	while (np) {
+		int idx = 0;
+
+		if (name)
+			idx = of_property_match_string(np, "clock-names", name);
+
+		if (!of_parse_phandle_with_args(np, "clocks", "#clock-cells",
+						idx, spec))
+			return 0;
+
+		np = np->parent;
+		if (np && !of_get_property(np, "clock-ranges", NULL))
+			break;
+	}
+
+	return -ENOENT;
+}
 #endif
 
 /*
-- 
1.9.1

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