lkml.org 
[lkml]   [2017]   [Jun]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 5/8] arm64: dts: allwinner: a64: add SCPI DVFS nodes
Date
One functionality provided by the SCPI handler is frequency scaling,
which allows to switch the one CPU cluster between several operating
points, each specifying a matching frequency and CPU voltage.
The actual table is specified in firmware and can be queried by Linux
using standardised SCPI calls.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
---
arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi | 15 +++++++++++++++
1 file changed, 15 insertions(+)

diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
index ef6f10e..58c3675 100644
--- a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
+++ b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
@@ -61,6 +61,7 @@
device_type = "cpu";
reg = <0>;
enable-method = "psci";
+ clocks = <&scpi_dvfs 0>;
};

cpu1: cpu@1 {
@@ -68,6 +69,7 @@
device_type = "cpu";
reg = <1>;
enable-method = "psci";
+ clocks = <&scpi_dvfs 0>;
};

cpu2: cpu@2 {
@@ -75,6 +77,7 @@
device_type = "cpu";
reg = <2>;
enable-method = "psci";
+ clocks = <&scpi_dvfs 0>;
};

cpu3: cpu@3 {
@@ -82,6 +85,7 @@
device_type = "cpu";
reg = <3>;
enable-method = "psci";
+ clocks = <&scpi_dvfs 0>;
};
};

@@ -148,6 +152,17 @@
compatible = "arm,scpi";
mboxes = <&mailbox 0>;
shmem = <&cpu_scp_mem>;
+
+ scpi-clocks {
+ compatible = "arm,scpi-clocks";
+
+ scpi_dvfs: scpi_dvfs_clocks {
+ compatible = "arm,scpi-dvfs-clocks";
+ #clock-cells = <1>;
+ clock-indices = <0>;
+ clock-output-names = "cpu_clk";
+ };
+ };
};

soc {
--
2.9.0
\
 
 \ /
  Last update: 2017-06-30 23:11    [W:0.103 / U:4.572 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site