linux-kernel - [PATCH 4/4] ARM: dts: keystone: k2g-evm: Move audio oscillator assigned clock to mcasp

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Date:   Mon, 10 May 2021 09:43:12 -0500
From:   Nishanth Menon <nm@...com>
To:     Santosh Shilimkar <ssantosh@...nel.org>
CC:     <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <kristo@...nel.org>,
        Nishanth Menon <nm@...com>
Subject: [PATCH 4/4] ARM: dts: keystone: k2g-evm: Move audio oscillator assigned clock to mcasp

Setting assigned clock with a dependency on itself for k2g_clks
creates a circular dependency. Instead, Lets model the audio clock
as a assigned-clock configuration for mcasp and set it up as the
first clock assigned-clock to be satisfied. Following the standard
convention, we use null entries to indicate entries that doesn't need
to be programmed.

References:
[1] schematics: https://www.ti.com/lit/df/sprr302/sprr302.pdf
[2] TRM: https://www.ti.com/lit/ug/spruhy8i/spruhy8i.pdf

Signed-off-by: Nishanth Menon <nm@...com>
---
yaml fixup series:
https://lore.kernel.org/linux-arm-kernel/20210503190824.GA2192378@robh.at.kernel.org

Specific yaml:
https://lore.kernel.org/linux-arm-kernel/20210426155457.21221-3-nm@ti.com/

 arch/arm/boot/dts/keystone-k2g-evm.dts | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/arch/arm/boot/dts/keystone-k2g-evm.dts b/arch/arm/boot/dts/keystone-k2g-evm.dts
index 14e26a4fd62a..d800f26b6275 100644
--- a/arch/arm/boot/dts/keystone-k2g-evm.dts
+++ b/arch/arm/boot/dts/keystone-k2g-evm.dts
@@ -544,20 +544,15 @@ dpi_out: endpoint {
 	};
 };
 
-&k2g_clks {
-	/* on the board 22.5792MHz is connected to AUDOSC_IN */
-	assigned-clocks = <&k2g_clks 0x4c 2>;
-	assigned-clock-rates = <22579200>;
-};
-
 &mcasp2 {
 	#sound-dai-cells = <0>;
 
 	pinctrl-names = "default";
 	pinctrl-0 = <&mcasp2_pins>;
 
-	assigned-clocks = <&k2g_clks 0x6 1>;
-	assigned-clock-parents = <&k2g_clks 0x6 2>;
+	assigned-clocks = <&k2g_clks 0x4c 2>, <&k2g_clks 0x6 1>;
+	assigned-clock-parents = <0>, <&k2g_clks 0x6 2>;
+	assigned-clock-rates = <22579200>, <0>;
 
 	status = "okay";
 
-- 
2.31.0