[Letux-kernel] [PATCH v3 8/8] ARM: dts: Add OPP-V2 table for AM3517

H. Nikolaus Schaller hns at goldelico.com
Wed Sep 11 19:47:14 CEST 2019


From: Adam Ford <aford173 at gmail.com>

The AM3517 only lists 600MHz @ 1.2V, but the register values for
0x4830A204 = 1b86 802f, it seems like am3517 might be a derivative
of the omap36 which OPPs would be OPP50 (300 MHz) and OPP100
(600 MHz).

This patch sets up the OPP50 and OPP100 tables at 300MHz and 600MHz
for the AM3517 with each having an operating voltage at 1.2V.

Signed-off-by: Adam Ford <aford173 at gmail.com>
Tested-by: Adam Ford <aford173 at gmail.com>
Signed-off-by: H. Nikolaus Schaller <hns at goldelico.com>
---
 arch/arm/boot/dts/am3517.dtsi | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/arch/arm/boot/dts/am3517.dtsi b/arch/arm/boot/dts/am3517.dtsi
index 23ea381d363f..a0f23361d4bc 100644
--- a/arch/arm/boot/dts/am3517.dtsi
+++ b/arch/arm/boot/dts/am3517.dtsi
@@ -16,6 +16,37 @@
 		can = &hecc;
 	};
 
+	cpus {
+		cpu: cpu at 0 {
+			/* Based on OMAP3630 variants OPP50 and OPP100 */
+			operating-points-v2 = <&cpu0_opp_table>;
+
+			clock-latency = <300000>; /* From legacy driver */
+		};
+	};
+
+	cpu0_opp_table: opp-table {
+		compatible = "operating-points-v2-ti-cpu";
+		syscon = <&scm_conf>;
+		/*
+		 * AM3517 TRM only lists 600MHz @ 1.2V, but omap36xx
+		 * appear to operate at 300MHz as well. Since AM3517 only
+		 * lists one operating voltage, it will remain fixed at 1.2V
+		 */
+		opp50-300000000 {
+			opp-hz = /bits/ 64 <300000000>;
+			opp-microvolt = <1200000>;
+			opp-supported-hw = <0xffffffff 0xffffffff>;
+			opp-suspend;
+		};
+
+		opp100-600000000 {
+			opp-hz = /bits/ 64 <600000000>;
+			opp-microvolt = <1200000>;
+			opp-supported-hw = <0xffffffff 0xffffffff>;
+		};
+	};
+
 	ocp at 68000000 {
 		am35x_otg_hs: am35x_otg_hs at 5c040000 {
 			compatible = "ti,omap3-musb";
-- 
2.19.1



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