linux-kernel - [PATCH V3] arm64: dts: ti: k3-am62: use opp_efuse

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Message-ID: <20241104063707.3604302-1-d-gole@ti.com>
Date: Mon, 4 Nov 2024 12:07:08 +0530
From: Dhruva Gole <d-gole@...com>
To: Nishanth Menon <nm@...com>, Vignesh Raghavendra <vigneshr@...com>
CC: <linux-pm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
        Dhruva Gole <d-gole@...com>, Rob Herring <robh@...nel.org>,
        Krzysztof
 Kozlowski <krzk+dt@...nel.org>, Bryan Brattlof <bb@...com>,
        Wadim Egorov
	<w.egorov@...tec.de>
Subject: [PATCH V3] arm64: dts: ti: k3-am62: use opp_efuse_table for opp-table syscon

Add another entry in the wkup_conf for the syscon node, and then use
that for the syscon in opp-table.

Marking entire wkup_conf as "syscon", "simple-mfd" is wrong and needs to
be addressed similar to how other child-nodes in wkup_conf are implemented
in the same file.

Signed-off-by: Dhruva Gole <d-gole@...com>
---

Since the driver fixes for ti-cpufreq.c have made it in -next [1],
The DT fixes for SK-AM62x can be supported with support for legacy
style DT as well. This has been tested on SK-AM62x [2]

[2] https://gist.github.com/DhruvaG2000/40b80cc04a9ac90c86445d6e67ece4cb
[1] https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/drivers/cpufreq/ti-cpufreq.c?id=1724ae88efcbcd0daeb203ffeb4a2c0e59f2ddf7

Changelog:
v3:
- Update syscon@...00000 to say bus@...
- Validated that these changes don't break U-Boot:
https://gist.github.com/DhruvaG2000/2833b895dc79d5ce16265ecf15310add
- Link to v2:
https://lore.kernel.org/all/20241030044553.3225383-1-d-gole@ti.com/

v2:
- Deleted PATCH to Make the AM625 efuse_offset 0, because with [1] we no
  longer break backward compatibility and hence need to preserve the old
  offset.
- Link to v1:
  https://lore.kernel.org/linux-arm-kernel/20240902093222.2828345-3-d-gole@ti.com/

---

 arch/arm64/boot/dts/ti/k3-am62-wakeup.dtsi | 9 +++++++--
 arch/arm64/boot/dts/ti/k3-am625.dtsi       | 2 +-
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/boot/dts/ti/k3-am62-wakeup.dtsi b/arch/arm64/boot/dts/ti/k3-am62-wakeup.dtsi
index e0afafd532a5..9b8a1f85aa15 100644
--- a/arch/arm64/boot/dts/ti/k3-am62-wakeup.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-am62-wakeup.dtsi
@@ -8,9 +8,9 @@
 #include <dt-bindings/bus/ti-sysc.h>
 
 &cbass_wakeup {
-	wkup_conf: syscon@...00000 {
+	wkup_conf: bus@...00000 {
 		bootph-all;
-		compatible = "syscon", "simple-mfd";
+		compatible = "simple-bus";
 		reg = <0x00 0x43000000 0x00 0x20000>;
 		#address-cells = <1>;
 		#size-cells = <1>;
@@ -22,6 +22,11 @@ chipid: chipid@14 {
 			reg = <0x14 0x4>;
 		};
 
+		opp_efuse_table: syscon@18 {
+			compatible = "ti,am62-opp-efuse-table", "syscon";
+			reg = <0x18 0x4>;
+		};
+
 		cpsw_mac_syscon: ethernet-mac-syscon@200 {
 			compatible = "ti,am62p-cpsw-mac-efuse", "syscon";
 			reg = <0x200 0x8>;
diff --git a/arch/arm64/boot/dts/ti/k3-am625.dtsi b/arch/arm64/boot/dts/ti/k3-am625.dtsi
index c3d1db47dc9f..c249883a8a8d 100644
--- a/arch/arm64/boot/dts/ti/k3-am625.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-am625.dtsi
@@ -108,7 +108,7 @@ cpu3: cpu@3 {
 	a53_opp_table: opp-table {
 		compatible = "operating-points-v2-ti-cpu";
 		opp-shared;
-		syscon = <&wkup_conf>;
+		syscon = <&opp_efuse_table>;
 
 		opp-200000000 {
 			opp-hz = /bits/ 64 <200000000>;

base-commit: dec9255a128e19c5fcc3bdb18175d78094cc624d
-- 
2.34.1