[PATCH 2/2] ARM: dts: mx28: Fix sgtl5000 codec probe

[Fabio Estevam]

From: Fabio Estevam <fabio.estevam at freescale.com>

Since commit 9e13f345887 (ASoC: sgtl5000: Let the codec acquire its clock)it is 
necessary to pass a codec clock to the sgtl5000 driver.

On some boards the sgtl5000 codec is driven via SAIF MCLK signal, so enable it
early in machine code to allow the I2C codec access to succeed.

Since the saif mclk cannot be passed as a real clock within the clock framework,
let's pass a dummy one to the codec driver.

Signed-off-by: Fabio Estevam <fabio.estevam at freescale.com>
---
Tested on a mx28evk board running linux-next 20130621

 arch/arm/boot/dts/imx28-apx4devkit.dts |  2 +-
 arch/arm/boot/dts/imx28-evk.dts        |  2 +-
 arch/arm/boot/dts/imx28-m28evk.dts     |  2 +-
 arch/arm/mach-mxs/mach-mxs.c           | 41 ++++++++++++++++++++++++++++++++++
 4 files changed, 44 insertions(+), 3 deletions(-)

diff --git a/arch/arm/boot/dts/imx28-apx4devkit.dts b/arch/arm/boot/dts/imx28-apx4devkit.dts
index 43bf3c7..f26bf2f 100644
--- a/arch/arm/boot/dts/imx28-apx4devkit.dts
+++ b/arch/arm/boot/dts/imx28-apx4devkit.dts
@@ -147,7 +147,7 @@
 					reg = <0x0a>;
 					VDDA-supply = <&reg_3p3v>;
 					VDDIO-supply = <&reg_3p3v>;
-
+					clocks = <&clks 65>;
 				};
 
 				pcf8563: rtc at 51 {
diff --git a/arch/arm/boot/dts/imx28-evk.dts b/arch/arm/boot/dts/imx28-evk.dts
index 3637bf3..28f20b6 100644
--- a/arch/arm/boot/dts/imx28-evk.dts
+++ b/arch/arm/boot/dts/imx28-evk.dts
@@ -193,7 +193,7 @@
 					reg = <0x0a>;
 					VDDA-supply = <&reg_3p3v>;
 					VDDIO-supply = <&reg_3p3v>;
-
+					clocks = <&clks 65>;
 				};
 
 				at24 at 51 {
diff --git a/arch/arm/boot/dts/imx28-m28evk.dts b/arch/arm/boot/dts/imx28-m28evk.dts
index 880df2f..a09c5bf 100644
--- a/arch/arm/boot/dts/imx28-m28evk.dts
+++ b/arch/arm/boot/dts/imx28-m28evk.dts
@@ -184,7 +184,7 @@
 					reg = <0x0a>;
 					VDDA-supply = <&reg_3p3v>;
 					VDDIO-supply = <&reg_3p3v>;
-
+					clocks = <&clks 65>;
 				};
 
 				eeprom: eeprom at 51 {
diff --git a/arch/arm/mach-mxs/mach-mxs.c b/arch/arm/mach-mxs/mach-mxs.c
index 6298adb..57ab042 100644
--- a/arch/arm/mach-mxs/mach-mxs.c
+++ b/arch/arm/mach-mxs/mach-mxs.c
@@ -27,6 +27,7 @@
 #include <linux/phy.h>
 #include <linux/pinctrl/consumer.h>
 #include <linux/sys_soc.h>
+#include <linux/stmp_device.h>
 #include <asm/mach/arch.h>
 #include <asm/mach/map.h>
 #include <asm/mach/time.h>
@@ -59,6 +60,8 @@
 #define MXS_CLR_ADDR		0x8
 #define MXS_TOG_ADDR		0xc
 
+#define SAIF0			0x100
+
 static u32 chipid;
 static u32 socid;
 
@@ -264,11 +267,46 @@ static inline void enable_clk_enet_out(void)
 		clk_prepare_enable(clk);
 }
 
+static void __init mxs_enable_mclk(void)
+{
+	struct device_node *np;
+	void __iomem *clkctrl_base, *saif_base;
+
+	np = of_find_compatible_node(NULL, NULL, "fsl,clkctrl");
+	clkctrl_base = of_iomap(np, 0);
+
+	if (!clkctrl_base)
+		return;
+
+	/*
+	 * DIV_FRAC_EN, MCLK frequency = 44.1KHz * 512 =  22.5792MHz
+	 * This initial MCLK frequency is just to allow I2C access to the
+	 * SGLT5000 codec to work
+	 */
+	writel(0x10c0b, clkctrl_base + SAIF0);
+
+	iounmap(clkctrl_base);
+	of_node_put(np);
+
+	np = of_find_compatible_node(NULL, NULL, "fsl,imx28-saif");
+	saif_base = of_iomap(np, 0);
+
+	if (!saif_base)
+		return;
+
+	stmp_reset_block(saif_base);
+	writel(1, saif_base + STMP_OFFSET_REG_SET);
+
+	iounmap(saif_base);
+	of_node_put(np);
+}
+
 static void __init imx28_evk_init(void)
 {
 	update_fec_mac_prop(OUI_FSL);
 
 	mxs_saif_clkmux_select(MXS_DIGCTL_SAIF_CLKMUX_EXTMSTR0);
+	mxs_enable_mclk();
 }
 
 static void __init imx28_evk_post_init(void)
@@ -293,6 +331,7 @@ static void __init apx4devkit_init(void)
 	if (IS_BUILTIN(CONFIG_PHYLIB))
 		phy_register_fixup_for_uid(PHY_ID_KSZ8051, MICREL_PHY_ID_MASK,
 					   apx4devkit_phy_fixup);
+	mxs_enable_mclk();
 }
 
 #define ENET0_MDC__GPIO_4_0	MXS_GPIO_NR(4, 0)
@@ -483,6 +522,8 @@ static void __init mxs_machine_init(void)
 		 of_machine_is_compatible("crystalfontz,cfa10055") ||
 		 of_machine_is_compatible("crystalfontz,cfa10057"))
 		crystalfontz_init();
+	else if (of_machine_is_compatible("denx,m28evk"))
+		mxs_enable_mclk();
 
 	of_platform_populate(NULL, of_default_bus_match_table,
 			     mxs_auxdata_lookup, parent);
-- 
1.8.1.2