[PATCH v2 1/1] arm64: dts: ti: k3-j722s-evm: Switch audio codec clock from audio_refclk1 to external clock

In revision PROC170E1 of the J722SXH01EVM [0], the audio codec's
(TLV320AIC3106IRGZT [1]) MCLK was provided by the AUDIO_EXT_REFCLK1
(96MHz). Revisions PROC170E2 and later switched the MCLK's source
to an external LMK6CE012288CDLFT [2] oscillator (12.288MHz). The
PROC170E1 revision of the board is not publicly available.

Fix the audio codec's clock by creating a new fixed clock node with
a frequency of 12.288MHz, and switch the audio codec's clock from
the audio_refclk1 to the new fixed clock. Remove pinmuxing and clock
muxing for the audio_refclk1.

[0] https://www.ti.com/lit/zip/SPRR495
[1] https://www.ti.com/lit/gpn/TLV320AIC3106
[2] https://www.ti.com/lit/gpn/lmk6c

Signed-off-by: Jared McArthur <[email protected]>
Tested-by: Moteen Shah <[email protected]>
---
v2 changes:
- Change the audio codec mclk's name from lmk6x-clk to clock-12288000
  to resolve sashiko-bot's issue
- Change the alias from lmk6x_clk to tlv320_mclk (this mimics the
  k3-am62a7-sk.dts)

v1:
- Link: https://lore.kernel.org/all/[email protected]/

arch/arm64/boot/dts/ti/k3-j722s-evm.dts | 25 +++++++------------------
 1 file changed, 7 insertions(+), 18 deletions(-)

diff --git a/arch/arm64/boot/dts/ti/k3-j722s-evm.dts b/arch/arm64/boot/dts/ti/k3-j722s-evm.dts
index e66330c71593a..90c3e3c9c496e 100644
--- a/arch/arm64/boot/dts/ti/k3-j722s-evm.dts
+++ b/arch/arm64/boot/dts/ti/k3-j722s-evm.dts
@@ -162,6 +162,12 @@ vsys_io_1v2: regulator-vsys-io-1v2 {
 		regulator-boot-on;
 	};
 
+	tlv320_mclk: clock-12288000 {
+		compatible = "fixed-clock";
+		clock-frequency = <12288000>;
+		#clock-cells = <0>;
+	};
+
 	codec_audio: sound {
 		compatible = "simple-audio-card";
 		simple-audio-card,name = "J722S-EVM";
@@ -187,7 +193,7 @@ simple-audio-card,cpu {
 
 		sound_master: simple-audio-card,codec {
 			sound-dai = <&tlv320aic3106>;
-			clocks = <&audio_refclk1>;
+			clocks = <&tlv320_mclk>;
 		};
 	};
 
@@ -228,11 +234,6 @@ csi23_mux: mux-controller-1 {
 	};
 };
 
-&audio_refclk1 {
-	assigned-clocks = <&k3_clks 157 0>;
-	assigned-clock-parents = <&k3_clks 157 15>;
-};
-
 &cpsw_mac_syscon {
 	bootph-all;
 };
@@ -358,12 +359,6 @@ J722S_IOPAD(0x0084, PIN_INPUT, 2) /* (N21) GPMC0_ADVn_ALE.MCASP1_AXR2 */
 		>;
 	};
 
-	audio_ext_refclk1_pins_default: audio-ext-refclk1-default-pins {
-		pinctrl-single,pins = <
-			J722S_IOPAD(0x00a0, PIN_OUTPUT, 1) /* (N24) GPMC0_WPn.AUDIO_EXT_REFCLK1 */
-		>;
-	};
-
 	pmic_irq_pins_default: pmic-irq-default-pins {
 		pinctrl-single,pins = <
 			J722S_IOPAD(0x030, PIN_INPUT, 7) /* (K23) GPIO0_12 */
@@ -562,12 +557,6 @@ ldo3: ldo3 {
 	};
 };
 
-&k3_clks {
-	/* Configure AUDIO_EXT_REFCLK1 pin as output */
-	pinctrl-names = "default";
-	pinctrl-0 = <&audio_ext_refclk1_pins_default>;
-};
-
 &main_i2c0 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&main_i2c0_pins_default>;
-- 
2.34.1