ASoC: fsl_sai: Add clock controls for SAI

The SAI mainly has the following clocks:
  bus clock
    control and configure registers and to generate synchronous
    interrupts and DMA requests.

  mclk1, mclk2, mclk3
    to generate the bit clock when the receiver or transmitter is
    configured for an internally generated bit clock.

So this patch adds these clocks and their clock controls to the driver.

[ To concern the old DTB cases, I've added a bit of extra code to make
  the driver compatible with them. And by marking clock NULL if failed
  to get, the clk_prepare() or clk_get_rate() would easily return 0
  so no further path should be broken. -- by Nicolin ]

Signed-off-by: Nicolin Chen <Guangyu.Chen@freescale.com>
Acked-by: Xiubo Li <Li.Xiubo@freescale.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
(cherry picked from commit 17d1eb6628e70488c44c46003dcfe583696bb7b7)

1 files changed, 6 insertions, 3 deletions

diff --git a/Documentation/devicetree/bindings/sound/fsl-sai.txt b/Documentation/devicetree/bindings/sound/fsl-sai.txt
index 35c09fe5847a..0f4e23828190 100644
--- a/Documentation/devicetree/bindings/sound/fsl-sai.txt
+++ b/Documentation/devicetree/bindings/sound/fsl-sai.txt
@@ -10,7 +10,8 @@ Required properties:
 - compatible: Compatible list, contains "fsl,vf610-sai" or "fsl,imx6sx-sai".
 - reg: Offset and length of the register set for the device.
 - clocks: Must contain an entry for each entry in clock-names.
-- clock-names : Must include the "sai" entry.
+- clock-names : Must include the "bus" for register access and "mclk1" "mclk2"
+  "mclk3" for bit clock and frame clock providing.
 - dmas : Generic dma devicetree binding as described in
   Documentation/devicetree/bindings/dma/dma.txt.
 - dma-names : Two dmas have to be defined, "tx" and "rx".
@@ -30,8 +31,10 @@ sai2: sai@40031000 {
               reg = <0x40031000 0x1000>;
               pinctrl-names = "default";
               pinctrl-0 = <&pinctrl_sai2_1>;
-              clocks = <&clks VF610_CLK_SAI2>;
-              clock-names = "sai";
+              clocks = <&clks VF610_CLK_PLATFORM_BUS>,
+                     <&clks VF610_CLK_SAI2>,
+                     <&clks 0>, <&clks 0>;
+              clock-names = "bus", "mclk1", "mclk2", "mclk3";
               dma-names = "tx", "rx";
               dmas = <&edma0 0 VF610_EDMA_MUXID0_SAI2_TX>,
                    <&edma0 0 VF610_EDMA_MUXID0_SAI2_RX>;