19.12.2016, 16:54, "Chen-Yu Tsai" [off-list ref]:

On Mon, Dec 19, 2016 at 4:46 PM, Maxime Ripard
[off-list ref] wrote:

quoted

?On Fri, Dec 16, 2016 at 02:27:54AM +0800, Icenowy Zheng wrote:

quoted

?An operating point table is needed for the cpu frequency adjusting to
?work.

?The operating point table is converted from the common value in
?extracted script.fex from many A33 board/tablets.

?Signed-off-by: Icenowy Zheng [off-list ref]
?---
?Changes since v1:
?- Fix format problem (blank lines).
?- Removed the 1.344GHz operating point, as it's overvoltage and overclocked.

?This patch depends on the following patchset:

?http://lists.infradead.org/pipermail/linux-arm-kernel/2016-December/473962.html

?It's the v2 of the [PATCH 4/6] in this patchset.

?I think this operating point table may also apply to A23, as there's no
?difference except the points over 1.2GHz between A23 and A33's stock dvfs table.

?But as A23 CCU may not have the necessary fixes, I won't add the table to A23
?now.

?Chen-Yu, could you test the CCU fixes I described in the patchset above on A23,
?then test this operating points table?

?If it's necessary, you can send out the CCU fixes and add one more patch that
?moves this opp-v2 table to sun8i-a23-a33.dtsi .

??arch/arm/boot/dts/sun8i-a33.dtsi | 35 +++++++++++++++++++++++++++++++++++
??1 file changed, 35 insertions(+)

?diff --git a/arch/arm/boot/dts/sun8i-a33.dtsi b/arch/arm/boot/dts/sun8i-a33.dtsi
?index 504996cbee29..0f5b2af72981 100644
?--- a/arch/arm/boot/dts/sun8i-a33.dtsi
?+++ b/arch/arm/boot/dts/sun8i-a33.dtsi
?@@ -46,7 +46,42 @@
??#include <dt-bindings/dma/sun4i-a10.h>

??/ {
?+ cpu0_opp_table: opp_table0 {
?+ compatible = "operating-points-v2";
?+ opp-shared;
?+
?+ opp at 648000000 {
?+ opp-hz = /bits/ 64 <648000000>;
?+ opp-microvolt = <1040000>;
?+ clock-latency-ns = <244144>; /* 8 32k periods */
?+ };
?+
?+ opp at 816000000 {
?+ opp-hz = /bits/ 64 <816000000>;
?+ opp-microvolt = <1100000>;
?+ clock-latency-ns = <244144>; /* 8 32k periods */
?+ };
?+
?+ opp at 1008000000 {
?+ opp-hz = /bits/ 64 <1008000000>;
?+ opp-microvolt = <1200000>;
?+ clock-latency-ns = <244144>; /* 8 32k periods */
?+ };
?+
?+ opp at 1200000000 {
?+ opp-hz = /bits/ 64 <1200000000>;
?+ opp-microvolt = <1320000>;
?+ clock-latency-ns = <244144>; /* 8 32k periods */
?+ };
?+ };
?+
???????cpus {
?+ cpu0: cpu at 0 {

?There's no need to duplicate the label here. I removed it and applied.

I think using the label to directly reference cpu0 would be better,
instead of duplicating the cpu at 0 block.

After proper testing of A23 ccu, the operating points can also apply to A23.
(According to A23 devices' fex)

ChenYu