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From:   Vaishnav Achath <vaishnav.a@ti.com>
To:     <vigneshr@ti.com>, <nm@ti.com>, <kristo@kernel.org>,
        <krzysztof.kozlowski+dt@linaro.org>, <afd@ti.com>
CC:     <vaishnav.a@ti.com>, <devicetree@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>,
        <linux-kernel@vger.kernel.org>, <robh+dt@kernel.org>,
        <u-kumar1@ti.com>
Subject: [PATCH v3 2/2] arm64: dts: ti: k3-j7200-mcu-wakeup: Update fss node and hbmc_mux
Date:   Sat, 13 May 2023 15:43:43 +0530
Message-ID: <20230513101343.785-3-vaishnav.a@ti.com>
In-Reply-To: <20230513101343.785-1-vaishnav.a@ti.com>
References: <20230513101343.785-1-vaishnav.a@ti.com>
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From: Nishanth Menon <nm@ti.com>

FSS node claims to be a syscon node, while it actually is a simple bus
where OSPI, HBMC peripherals are located and a mux for path select
between OSPI and Hyperbus which can be modelled as a reg-mux. So model
it accordingly and use reg-mux to describe the hbmc_mux.

Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Vaishnav Achath <vaishnav.a@ti.com>
---

V2->V3:
 * Keep register regions unchanged as it is correct according to memory
  map.
 * Update commit messages as per Vignesh's suggestion.

V1->V2:
 * Address feedback from Udit to limit the FSS register region size as
 per TRM.
 * Use reg-mux changes to simplify the hbmc-mux modelling.
 * Update commit message to reflect changes.

Depends on:
 https://lore.kernel.org/all/20230424184810.29453-1-afd@ti.com/

 arch/arm64/boot/dts/ti/k3-j7200-mcu-wakeup.dtsi | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/boot/dts/ti/k3-j7200-mcu-wakeup.dtsi b/arch/arm64/boot/dts/ti/k3-j7200-mcu-wakeup.dtsi
index b58a31371bf3..a7dd771b83e2 100644
--- a/arch/arm64/boot/dts/ti/k3-j7200-mcu-wakeup.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-j7200-mcu-wakeup.dtsi
@@ -338,15 +338,16 @@
 		status = "disabled";
 	};
 
-	fss: syscon@47000000 {
-		compatible = "syscon", "simple-mfd";
+	fss: bus@47000000 {
+		compatible = "simple-bus";
 		reg = <0x00 0x47000000 0x00 0x100>;
 		#address-cells = <2>;
 		#size-cells = <2>;
 		ranges;
 
-		hbmc_mux: hbmc-mux {
-			compatible = "mmio-mux";
+		hbmc_mux: mux-controller@47000004 {
+			compatible = "reg-mux";
+			reg = <0x00 0x47000004 0x00 0x2>;
 			#mux-control-cells = <1>;
 			mux-reg-masks = <0x4 0x2>; /* HBMC select */
 		};
-- 
2.17.1