clk: mxs: replace imx23 clk_register_clkdev with clock DT lookup

It really becomes a maintenance issue that every time a device needs
to look up (clk_get) a clock we have to patch kernel clock file to call
clk_register_clkdev for that clock.

Since clock DT support which is meant to resolve clock lookup in device
tree is in place, the patch moves imx23 client devices' clock lookup
over to device tree, so that any new lookup to be added at later time
can just get done in DT instead of kernel.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

1 files changed, 76 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/clock/imx23-clock.txt b/Documentation/devicetree/bindings/clock/imx23-clock.txt
new file mode 100644
index 000000000000..a0b867ef8d96
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/imx23-clock.txt
@@ -0,0 +1,76 @@
+* Clock bindings for Freescale i.MX23
+
+Required properties:
+- compatible: Should be "fsl,imx23-clkctrl"
+- reg: Address and length of the register set
+- #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 full list of i.MX23
+clocks and IDs.
+
+        Clock           ID
+        ------------------
+        ref_xtal        0
+        pll             1
+        ref_cpu         2
+        ref_emi         3
+        ref_pix         4
+        ref_io          5
+        saif_sel        6
+        lcdif_sel       7
+        gpmi_sel        8
+        ssp_sel         9
+        emi_sel         10
+        cpu             11
+        etm_sel         12
+        cpu_pll         13
+        cpu_xtal        14
+        hbus            15
+        xbus            16
+        lcdif_div       17
+        ssp_div         18
+        gpmi_div        19
+        emi_pll         20
+        emi_xtal        21
+        etm_div         22
+        saif_div        23
+        clk32k_div      24
+        rtc             25
+        adc             26
+        spdif_div       27
+        clk32k          28
+        dri             29
+        pwm             30
+        filt            31
+        uart            32
+        ssp             33
+        gpmi            34
+        spdif           35
+        emi             36
+        saif            37
+        lcdif           38
+        etm             39
+        usb             40
+        usb_pwr         41
+
+Examples:
+
+clks: clkctrl@80040000 {
+        compatible = "fsl,imx23-clkctrl";
+        reg = <0x80040000 0x2000>;
+        #clock-cells = <1>;
+        clock-output-names =
+                ...
+                "uart",         /* 32 */
+                ...
+                "end_of_list";
+};
+
+auart0: serial@8006c000 {
+        compatible = "fsl,imx23-auart";
+        reg = <0x8006c000 0x2000>;
+        interrupts = <24 25 23>;
+        clocks = <&clks 32>;
+        status = "disabled";
+};