From 3b72fc895a2e57f70276b46f386f35d752adf555 Mon Sep 17 00:00:00 2001
From: Tony Lindgren <tony@atomide.com>
Date: Mon, 26 Aug 2019 08:47:08 -0700
Subject: ARM: dts: Configure interconnect target module for omap3 sgx
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Looks like omap34xx OCP registers are not readable unlike on omap36xx.
We use SGX revision register instead of the OCP revision register for
34xx and do not configure any SYSCONFIG register unlike for 36xx.

I've tested that the interconnect target module enables and idles
just fine with PM runtime control via sys:

# echo on > $(find /sys -name control | grep \/5000); rwmem 0x5000fe10
# rwmem 0x50000014	# SGX revision register on 36xx
0x50000014 = 0x00010205
# echo auto > $(find /sys -name control | grep \/5000)
# rwmem 0x5000fe00
And when idled, it will produce "Bus error" as expected.

Cc: Adam Ford <aford173@gmail.com>
Cc: Filip Matijević <filip.matijevic.pz@gmail.com>
Cc: "H. Nikolaus Schaller" <hns@goldelico.com>
Cc: Ivaylo Dimitrov <ivo.g.dimitrov.75@gmail.com>
Cc: moaz korena <moaz@korena.xyz>
Cc: Merlijn Wajer <merlijn@wizzup.org>
Cc: Paweł Chmiel <pawel.mikolaj.chmiel@gmail.com>
Cc: Philipp Rossak <embed3d@gmail.com>
Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
Tested-by: Adam Ford <aford173@gmail.com> #logicpd-torpedo-37xx-devkit
Signed-off-by: Tony Lindgren <tony@atomide.com>
---
 arch/arm/boot/dts/omap36xx.dtsi | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

(limited to 'arch/arm/boot/dts/omap36xx.dtsi')

diff --git a/arch/arm/boot/dts/omap36xx.dtsi b/arch/arm/boot/dts/omap36xx.dtsi
index 6fb23ada1f64..1e552f08f120 100644
--- a/arch/arm/boot/dts/omap36xx.dtsi
+++ b/arch/arm/boot/dts/omap36xx.dtsi
@@ -139,6 +139,34 @@
 				interrupts = <18>;
 			};
 		};
+
+		/*
+		 * Note that the sysconfig register layout is a subset of the
+		 * "ti,sysc-omap4" type register with just sidle and midle bits
+		 * available while omap34xx has "ti,sysc-omap2" type sysconfig.
+		 */
+		sgx_module: target-module@50000000 {
+			compatible = "ti,sysc-omap4", "ti,sysc";
+			reg = <0x5000fe00 0x4>,
+			      <0x5000fe10 0x4>;
+			reg-names = "rev", "sysc";
+			ti,sysc-midle = <SYSC_IDLE_FORCE>,
+					<SYSC_IDLE_NO>,
+					<SYSC_IDLE_SMART>;
+			ti,sysc-sidle = <SYSC_IDLE_FORCE>,
+					<SYSC_IDLE_NO>,
+					<SYSC_IDLE_SMART>;
+			clocks = <&sgx_fck>, <&sgx_ick>;
+			clock-names = "fck", "ick";
+			#address-cells = <1>;
+			#size-cells = <1>;
+			ranges = <0 0x50000000 0x2000000>;
+
+			/*
+			 * Closed source PowerVR driver, no child device
+			 * binding or driver in mainline
+			 */
+		};
 	};
 
 	thermal_zones: thermal-zones {
-- 
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