Subject: [PATCH] arm64: dts: rockchip: add the power domain node for rk3399

From: [email-masked] (Caesar Wang)
Date: Fri, 01 Jul 2016 10:11:24 +0800

Thanks your reviewing!

On 2016?07?01? 05:57, Heiko Stuebner wrote:
> Am Donnerstag, 30. Juni 2016, 14:49:41 schrieb Doug Anderson:
>> Caesar,
>>
>> On Wed, Jun 29, 2016 at 6:56 PM, Caesar Wang <[email-masked]> wrote:
>>> From: Elaine Zhang <[email-masked]>
>>>
>>> In order to meet low power requirements, a power management unit (PMU)
>>> is
>>> designed for controlling power resources in RK3399. The RK3399 PMU is
>>> dedicated for managing the power of the whole chip.
>>>
>>> 1. add pd node for RK3399 Soc
>>> 2. create power domain tree
>>> 3. add qos node for domain
>>>
>>>  From the DT/binds and driver can get more detail information:
>>> The driver:
>>> drivers/soc/rockchip/pm_domains.c
>>> The document:
>>> Documentation/devicetree/bindings/soc/rockchip/power_domain.txt
>>>
>>> ---
>>>
>>> Tested on vop and gpu devices added for next kernel.
>>> PD:
>>> localhost / # cat sys/kernel/debug/pm_genpd/pm_genpd_summary
>> Nit: can you put a "/" before "sys" here and elsewhere in your patches?
>>
>>> domain                          status          slaves
>>> /device                                             runtime status
>>> ----------------------------------------------------------------------
>>> pd_gpu                          on
>>> /devices/platform/ff9a0000.gpu                      active
>>> pd_vopl                         off
>>> /devices/platform/ff8f0000.vop                      suspended
>>> pd_vopb                         off
>>> /devices/platform/ff900000.vop                      suspended
>>> pd_vo                           off             pd_vopb, pd_vopl
>>> pd_hdcp                         off
>>> ...
>>> pd_iep                          off
>>> pd_vcodec                       off
>>> pd_vdu                          off
>>>
>>> QOS:
>>> localhost / # cat sys/kernel/debug/pm_qos/
>>> cpu_dma_latency     network_latency
>>> memory_bandwidth    network_throughput
>> What is this supposed to be showing exactly?  You can't "cat" a
>> directory, so maybe you meant "ls"?
>>
>> Also, each of these files contains the string "Empty!" and these files
>> seem fairly unconnected to your patch.  Those files exist both before
>> and after your patch and nothing that I can see in the Rockchip QoS
>> stuff hooks up to the generic Linux QoS infrastructure.  The power
>> domains just save and restore the QoS--they don't actually allow
>> settting it.
> personally, I would just drop that debugfs-dump, as I don't see what we gain
> from it :-).

Agreed, drop it.

>>> Signed-off-by: Elaine Zhang <[email-masked]>
>>> Signed-off-by: Caesar Wang <[email-masked]>
>>> ---
> [...]
>
>>> +       pmu: power-management at ff310000 {
>>> +               compatible = "rockchip,rk3399-pmu", "syscon",
>>> "simple-mfd"; +               reg = <0x0 0xff310000 0x0 0x1000>;
>>> +
>>> +               power: power-controller {
>>> +                       status = "okay";
>>> +                       compatible = "rockchip,rk3399-power-controller";
>>> +                       #power-domain-cells = <1>;
>>> +                       #address-cells = <1>;
>>> +                       #size-cells = <0>;
>>> +
>>> +                       pd_vdu {
>>> +                               reg = <RK3399_PD_VDU>;
>>> +                               clocks = <&cru ACLK_VDU>,
>>> +                                        <&cru HCLK_VDU>;
>>> +                               pm_qos = <&qos_video_m1_r>,
>>> +                                        <&qos_video_m1_w>;
>>> +                       };
>>> +                       pd_vcodec {
>>> +                               reg = <RK3399_PD_VCODEC>;
>>> +                               clocks = <&cru ACLK_VCODEC>,
>>> +                                        <&cru HCLK_VCODEC>;
>>> +                               pm_qos = <&qos_video_m0>;
>>> +                       };
>>> +                       pd_iep {
>>> +                               reg = <RK3399_PD_IEP>;
>>> +                               clocks = <&cru ACLK_IEP>,
>>> +                                        <&cru HCLK_IEP>;
>>> +                               pm_qos = <&qos_iep>;
>>> +                       };
>>> +                       pd_rga {
>>> +                               reg = <RK3399_PD_RGA>;
>>> +                               clocks = <&cru ACLK_RGA>,
>>> +                                        <&cru HCLK_RGA>;
>>> +                               pm_qos = <&qos_rga_r>,
>>> +                                        <&qos_rga_w>;
>>> +                       };
>>> +                       pd_vio {
>>> +                               reg = <RK3399_PD_VIO>;
>>> +                               #address-cells = <1>;
>>> +                               #size-cells = <0>;
>>> +
>>> +                               pd_isp0 {
>>> +                                       reg = <RK3399_PD_ISP0>;
>>> +                                       clocks = <&cru ACLK_ISP0>,
>>> +                                                <&cru HCLK_ISP0>;
>>> +                                       pm_qos = <&qos_isp0_m0>,
>>> +                                                <&qos_isp0_m1>;
>>> +                               };
>>> +                               pd_isp1 {
>>> +                                       reg = <RK3399_PD_ISP1>;
>>> +                                       clocks = <&cru ACLK_ISP1>,
>>> +                                                <&cru HCLK_ISP1>;
>>> +                                       pm_qos = <&qos_isp1_m0>,
>>> +                                                <&qos_isp1_m1>;
>>> +                               };
>>> +                               pd_hdcp {
>>> +                                       reg = <RK3399_PD_HDCP>;
>>> +                                       clocks = <&cru ACLK_HDCP>,
>>> +                                                <&cru HCLK_HDCP>,
>>> +                                                <&cru PCLK_HDCP>;
>>> +                                       pm_qos = <&qos_hdcp>;
>>> +                               };
>>> +                               pd_vo {
>>> +                                       reg = <RK3399_PD_VO>;
>>> +                                       #address-cells = <1>;
>>> +                                       #size-cells = <0>;
>>> +
>>> +                                       pd_vopb {
>>> +                                               reg = <RK3399_PD_VOPB>;
>>> +                                               clocks = <&cru
>>> ACLK_VOP0>, +
>>> <&cru HCLK_VOP0>; +
>>> pm_qos = <&qos_vop_big_r>, +
>>>              <&qos_vop_big_w>; +
>>> };
>>> +                                       pd_vopl {
>>> +                                               reg = <RK3399_PD_VOPL>;
>>> +                                               clocks = <&cru
>>> ACLK_VOP1>, +
>>> <&cru HCLK_VOP1>; +
>>> pm_qos = <&qos_vop_little>; +                                       };
>>> +                               };
>>> +                       };
>>> +                       pd_gpu {
>>> +                               reg = <RK3399_PD_GPU>;
>>> +                               clocks = <&cru ACLK_GPU>;
>>> +                               pm_qos = <&qos_gpu>;
>>> +                       };
>> Again a nitty sort order question.  Is there a reason not to make
>> things alphabetical?  AKA: pd_gpu, pd_iep, pd_rga, ...
>>
>> ...and inside pd_vio should be alphabetical too?
>>
>> In the TRM it looks like some of the power domains are grouped
>> together (like all the domains under LOGIC or CENTERLOGIC).  If
>> keeping that grouping makes sense here then you should add a comment
>> at the start of each group and sort the groups sanely (and sort within
>> each group).

Okay, let me see it.

Thanks!

>>
>> It looks like there are also more power domains that you haven't
>> listed here (like PD_GMAC, for instance, or PD_CORE_L).  Are you
>> planning to add those in a followon patch?
> that reminds me, nodes with a reg property should have the base address in
> the node name as well. Using the constant works nicely, as can be seen on
> the rk3288 where we have for example:
>
> 	pd_vio at RK3288_PD_VIO

Agreed.

> Heiko

-- 
caesar wang | software engineer | wxt at rock-chip.com