ARM: imx: move imx53-qsb audio codec clk lookup into DT

With device tree clk lookup support in place, we can move audio codec
clk lookup for ssi_ext1 into device tree now, so that imx53_qsb_init()
can be saved.

Since ssi_ext2 lookup is used nowhere, it gets removed together with
ssi_ext1 lookup from clk driver.
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

arch/arm/boot/dts/imx53-qsb.dts

@@ -147,6 +147,7 @@ sgtl5000: codec@0a {
 		reg = <0x0a>;
 		VDDA-supply = <&reg_3p2v>;
 		VDDIO-supply = <&reg_3p2v>;
+		clocks = <&clks 150>;
 	};
 };
 

arch/arm/mach-imx/clk-imx51-imx53.c

@@ -327,8 +327,6 @@ static void __init mx5_clocks_common_init(unsigned long rate_ckil,
 	clk_register_clkdev(clk[ssi1_ipg_gate], NULL, "imx-ssi.0");
 	clk_register_clkdev(clk[ssi2_ipg_gate], NULL, "imx-ssi.1");
 	clk_register_clkdev(clk[ssi3_ipg_gate], NULL, "imx-ssi.2");
-	clk_register_clkdev(clk[ssi_ext1_gate], "ssi_ext1", NULL);
-	clk_register_clkdev(clk[ssi_ext2_gate], "ssi_ext2", NULL);
 	clk_register_clkdev(clk[sdma_gate], NULL, "imx35-sdma");
 	clk_register_clkdev(clk[cpu_podf], NULL, "cpufreq-cpu0.0");
 	clk_register_clkdev(clk[iim_gate], "iim", NULL);

arch/arm/mach-imx/mach-imx53.c

@@ -24,26 +24,10 @@
 #include "hardware.h"
 #include "mx53.h"
 
-static void __init imx53_qsb_init(void)
-{
-	struct clk *clk;
-
-	clk = clk_get_sys(NULL, "ssi_ext1");
-	if (IS_ERR(clk)) {
-		pr_err("failed to get clk ssi_ext1\n");
-		return;
-	}
-
-	clk_register_clkdev(clk, NULL, "0-000a");
-}
-
 static void __init imx53_dt_init(void)
 {
 	mxc_arch_reset_init_dt();
 
-	if (of_machine_is_compatible("fsl,imx53-qsb"))
-		imx53_qsb_init();
-
 	of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 }