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Message-ID: <1364293408-20677-1-git-send-email-rogerq@ti.com>
Date: Tue, 26 Mar 2013 12:23:27 +0200
From: Roger Quadros <rogerq@...com>
To: <tony@...mide.com>
CC: <rnayak@...com>, <b-cousson@...com>, <santosh.shilimkar@...com>,
<linux-omap@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<devicetree-discuss@...ts.ozlabs.org>,
<linux-kernel@...r.kernel.org>, Roger Quadros <rogerq@...com>
Subject: [PATCH v2] ARM: OMAP4: clock: Add device tree support for AUXCLKs
Register a device tree clock provider for the clocks
on the OMAP4 SoC. Also provide the binding information.
For now we only provide AUXCLKs.
Signed-off-by: Roger Quadros <rogerq@...com>
---
.../devicetree/bindings/clock/omap4-clock.txt | 33 ++++++++++++++++
arch/arm/boot/dts/omap4.dtsi | 5 ++
arch/arm/mach-omap2/cclock44xx_data.c | 41 ++++++++++++++++++++
3 files changed, 79 insertions(+), 0 deletions(-)
create mode 100644 Documentation/devicetree/bindings/clock/omap4-clock.txt
diff --git a/Documentation/devicetree/bindings/clock/omap4-clock.txt b/Documentation/devicetree/bindings/clock/omap4-clock.txt
new file mode 100644
index 0000000..2845a3f
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/omap4-clock.txt
@@ -0,0 +1,33 @@
+* Clock bindings for Texas Instruments OMAP4 clocks
+
+Required properties:
+- compatible: Should be "ti,omap4-clock"
+- #clock-cells: Should be <1>
+
+The clock consumer should specify the desired clock by having the clock
+ID in its "clocks" phandle cell. The following is a list of OMAP4 clocks
+and IDs.
+
+ Clock ID
+ ------------------
+ auxclk0_ck 0
+ auxclk1_ck 1
+ auxclk2_ck 2
+ auxclk3_ck 3
+ auxclk4_ck 4
+ auxclk5_ck 5
+
+Example:
+
+aux_clks: scrmclks {
+ compatible = "ti,omap4-clock";
+ #clock-cells = <1>;
+};
+
+hsusb1_phy: hsusb1_phy {
+ compatible = "usb-nop-xceiv";
+ reset-supply = <&hsusb1_reset>;
+ clocks = <&aux_clks 3>;
+ clock-names = "main_clk";
+ clock-frequency = <19200000>;
+};
diff --git a/arch/arm/boot/dts/omap4.dtsi b/arch/arm/boot/dts/omap4.dtsi
index 739bb79..f27548a 100644
--- a/arch/arm/boot/dts/omap4.dtsi
+++ b/arch/arm/boot/dts/omap4.dtsi
@@ -101,6 +101,11 @@
ti,hwmods = "counter_32k";
};
+ clks: clocks {
+ compatible = "ti,omap4-clock";
+ #clock-cells = <1>;
+ };
+
omap4_pmx_core: pinmux@...00040 {
compatible = "ti,omap4-padconf", "pinctrl-single";
reg = <0x4a100040 0x0196>;
diff --git a/arch/arm/mach-omap2/cclock44xx_data.c b/arch/arm/mach-omap2/cclock44xx_data.c
index 3d58f33..a93617b 100644
--- a/arch/arm/mach-omap2/cclock44xx_data.c
+++ b/arch/arm/mach-omap2/cclock44xx_data.c
@@ -27,6 +27,7 @@
#include <linux/clk-private.h>
#include <linux/clkdev.h>
#include <linux/io.h>
+#include <linux/of.h>
#include "soc.h"
#include "iomap.h"
@@ -1663,6 +1664,44 @@ static struct omap_clk omap44xx_clks[] = {
CLK(NULL, "cpufreq_ck", &dpll_mpu_ck, CK_443X),
};
+/*
+ * List of clocks that can be referenced in device tree
+ * Must match with Documentation/devicetree/bindings/clock/omap4-clock.txt
+ */
+static struct clk *dt_clks[] = {
+ &auxclk0_ck,
+ &auxclk1_ck,
+ &auxclk2_ck,
+ &auxclk3_ck,
+ &auxclk4_ck,
+ &auxclk5_ck,
+};
+
+static struct clk_onecell_data clock_data;
+
+#ifdef CONFIG_OF
+int __init omap4_clk_init_dt(void)
+{
+ struct device_node *np;
+
+ np = of_find_compatible_node(NULL, NULL, "ti,omap4-clock");
+ if (np) {
+ clock_data.clks = dt_clks;
+ clock_data.clk_num = ARRAY_SIZE(dt_clks);
+ of_clk_add_provider(np, of_clk_src_onecell_get, &clock_data);
+ }
+
+ return 0;
+}
+
+#else
+
+int __init omap4_clk_init_dt(void)
+{
+ return 0;
+}
+#endif /* CONFIG_OF */
+
int __init omap4xxx_clk_init(void)
{
u32 cpu_clkflg;
@@ -1693,6 +1732,8 @@ int __init omap4xxx_clk_init(void)
omap2_clk_disable_autoidle_all();
+ omap4_clk_init_dt();
+
/*
* On OMAP4460 the ABE DPLL fails to turn on if in idle low-power
* state when turning the ABE clock domain. Workaround this by
--
1.7.4.1
--
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