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arm64: dts: renesas: Add CPU capacity-dmips-mhz 

Set the capacity-dmips-mhz for R-Car Gen3 SoCs, that is based on
dhrystone. The average in 10 times of dhrystone result as follows:

r8a7795 SoC (A57x4 + A53x4)
  CPU   max-freq   dhrystone
  ---------------------------------
  A57   1500 MHz  11470943 lps/s
  A53   1200 MHz   4798583 lps/s

r8a7796 SoC (A57x2 + A53x4)
  CPU   max-freq   dhrystone
  ---------------------------------
  A57   1500 MHz  11463526 lps/s
  A53   1200 MHz   4793276 lps/s

Based on above, capacity-dmips-mhz values are calculated as follows:

r8a7795 SoC
  A57 : 1024 / (11470943 / 1500) * (11470943 / 1500) = 1024
  A53 : 1024 / (11470943 / 1500) * ( 4798583 / 1200) =  535

r8a7796 SoC
  A57 : 1024 / (11463526 / 1500) * (11463526 / 1500) = 1024
  A53 : 1024 / (11463526 / 1500) * ( 4793276 / 1200) =  535

However, since each CPUs have different max frequencies, the final
CPU capacities of A53 are scaled by this difference, the values are
as follows.

[r8a7795 SoC]
  $ cat /sys/devices/system/cpu/cpu*/cpu_capacity
  1024	<---- CPU capacity of A57
  1024
  1024
  1024
  428	<---- CPU capacity of A53
  428
  428
  428

[r8a7796 SoC]
  $ cat /sys/devices/system/cpu/cpu*/cpu_capacity
  1024	<---- CPU capacity of A57
  1024
  428	<---- CPU capacity of A53
  428
  428
  428

Signed-off-by: Gaku Inami <gaku.inami.xh@renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
This commit is contained in:
Gaku Inami 2018-11-08 16:24:55 +09:00 committed by Simon Horman
parent b380ae0db6
commit 2250d856b2
2 changed files with 14 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
arch/arm64/boot/dts/renesas/r8a7795.dtsi
View File

@ -157,6 +157,7 @@
enable-method = "psci";
clocks = <&cpg CPG_CORE R8A7795_CLK_Z>;
operating-points-v2 = <&cluster0_opp>;
capacity-dmips-mhz = <1024>;
#cooling-cells = <2>;
};
@ -169,6 +170,7 @@
enable-method = "psci";
clocks = <&cpg CPG_CORE R8A7795_CLK_Z>;
operating-points-v2 = <&cluster0_opp>;
capacity-dmips-mhz = <1024>;
#cooling-cells = <2>;
};
@ -181,6 +183,7 @@
enable-method = "psci";
clocks = <&cpg CPG_CORE R8A7795_CLK_Z>;
operating-points-v2 = <&cluster0_opp>;
capacity-dmips-mhz = <1024>;
#cooling-cells = <2>;
};
@ -193,6 +196,7 @@
enable-method = "psci";
clocks = <&cpg CPG_CORE R8A7795_CLK_Z>;
operating-points-v2 = <&cluster0_opp>;
capacity-dmips-mhz = <1024>;
#cooling-cells = <2>;
};
@ -205,6 +209,7 @@
enable-method = "psci";
clocks = <&cpg CPG_CORE R8A7795_CLK_Z2>;
operating-points-v2 = <&cluster1_opp>;
capacity-dmips-mhz = <535>;
};
a53_1: cpu@101 {
@ -216,6 +221,7 @@
enable-method = "psci";
clocks = <&cpg CPG_CORE R8A7795_CLK_Z2>;
operating-points-v2 = <&cluster1_opp>;
capacity-dmips-mhz = <535>;
};
a53_2: cpu@102 {
@ -227,6 +233,7 @@
enable-method = "psci";
clocks = <&cpg CPG_CORE R8A7795_CLK_Z2>;
operating-points-v2 = <&cluster1_opp>;
capacity-dmips-mhz = <535>;
};
a53_3: cpu@103 {
@ -238,6 +245,7 @@
enable-method = "psci";
clocks = <&cpg CPG_CORE R8A7795_CLK_Z2>;
operating-points-v2 = <&cluster1_opp>;
capacity-dmips-mhz = <535>;
};
L2_CA57: cache-controller-0 {

6
arch/arm64/boot/dts/renesas/r8a7796.dtsi
View File

@ -162,6 +162,7 @@
enable-method = "psci";
clocks = <&cpg CPG_CORE R8A7796_CLK_Z>;
operating-points-v2 = <&cluster0_opp>;
capacity-dmips-mhz = <1024>;
#cooling-cells = <2>;
};
@ -174,6 +175,7 @@
enable-method = "psci";
clocks = <&cpg CPG_CORE R8A7796_CLK_Z>;
operating-points-v2 = <&cluster0_opp>;
capacity-dmips-mhz = <1024>;
#cooling-cells = <2>;
};
@ -186,6 +188,7 @@
enable-method = "psci";
clocks = <&cpg CPG_CORE R8A7796_CLK_Z2>;
operating-points-v2 = <&cluster1_opp>;
capacity-dmips-mhz = <535>;
};
a53_1: cpu@101 {
@ -197,6 +200,7 @@
enable-method = "psci";
clocks = <&cpg CPG_CORE R8A7796_CLK_Z2>;
operating-points-v2 = <&cluster1_opp>;
capacity-dmips-mhz = <535>;
};
a53_2: cpu@102 {
@ -208,6 +212,7 @@
enable-method = "psci";
clocks = <&cpg CPG_CORE R8A7796_CLK_Z2>;
operating-points-v2 = <&cluster1_opp>;
capacity-dmips-mhz = <535>;
};
a53_3: cpu@103 {
@ -219,6 +224,7 @@
enable-method = "psci";
clocks = <&cpg CPG_CORE R8A7796_CLK_Z2>;
operating-points-v2 = <&cluster1_opp>;
capacity-dmips-mhz = <535>;
};
L2_CA57: cache-controller-0 {