| Message ID | 1621596371-26482-4-git-send-email-mkshah@codeaurora.org |
|---|---|
| State | New |
| Headers | show |
| Series | Introduce SoC sleep stats driver | expand |
On Wed 26 May 18:30 CDT 2021, Stephen Boyd wrote: > Quoting Maulik Shah (2021-05-21 04:26:09) > > Add device node for SoC sleep stats driver which provides various > > low power mode stats. > > > > Also update the reg size of aoss_qmp device to 0x400. > > > > Cc: devicetree@vger.kernel.org > > Signed-off-by: Maulik Shah <mkshah@codeaurora.org> > > Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> > > --- > > arch/arm64/boot/dts/qcom/sc7180.dtsi | 7 ++++++- > > 1 file changed, 6 insertions(+), 1 deletion(-) > > > > diff --git a/arch/arm64/boot/dts/qcom/sc7180.dtsi b/arch/arm64/boot/dts/qcom/sc7180.dtsi > > index 6228ba2..889d04d 100644 > > --- a/arch/arm64/boot/dts/qcom/sc7180.dtsi > > +++ b/arch/arm64/boot/dts/qcom/sc7180.dtsi > > @@ -3215,7 +3215,7 @@ > > > > aoss_qmp: power-controller@c300000 { > > compatible = "qcom,sc7180-aoss-qmp"; > > - reg = <0 0x0c300000 0 0x100000>; > > + reg = <0 0x0c300000 0 0x400>; > > interrupts = <GIC_SPI 389 IRQ_TYPE_EDGE_RISING>; > > mboxes = <&apss_shared 0>; > > > > @@ -3223,6 +3223,11 @@ > > #power-domain-cells = <1>; > > }; > > > > + rpmh-sleep-stats@c3f0000 { > > + compatible = "qcom,rpmh-sleep-stats"; > > + reg = <0 0x0c3f0000 0 0x400>; > > + }; > > + > > Does this need to be in DT? Can the sc7180-aoss-qmp driver use the > aux-bus and stick the sleep stats device on there? > The AOSS memory space has N chunks of "message ram", one is used for the QMP protocol (presumably the APSS specific one), a different one is used for the sleep stats. I presume we could have come up with a binding for the entire AOSS/AOP and then describe (either implicit or explicitly) the QMP and debug-stats under that. But we'd also have to come up with the same container-device for the RPM case. Regards, Bjorn > > spmi_bus: spmi@c440000 { > > compatible = "qcom,spmi-pmic-arb"; > > reg = <0 0x0c440000 0 0x1100>,
Quoting Bjorn Andersson (2021-05-31 10:57:03) > On Wed 26 May 18:30 CDT 2021, Stephen Boyd wrote: > > > Quoting Maulik Shah (2021-05-21 04:26:09) > > > Add device node for SoC sleep stats driver which provides various > > > low power mode stats. > > > > > > Also update the reg size of aoss_qmp device to 0x400. > > > > > > Cc: devicetree@vger.kernel.org > > > Signed-off-by: Maulik Shah <mkshah@codeaurora.org> > > > Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> > > > --- > > > arch/arm64/boot/dts/qcom/sc7180.dtsi | 7 ++++++- > > > 1 file changed, 6 insertions(+), 1 deletion(-) > > > > > > diff --git a/arch/arm64/boot/dts/qcom/sc7180.dtsi b/arch/arm64/boot/dts/qcom/sc7180.dtsi > > > index 6228ba2..889d04d 100644 > > > --- a/arch/arm64/boot/dts/qcom/sc7180.dtsi > > > +++ b/arch/arm64/boot/dts/qcom/sc7180.dtsi > > > @@ -3215,7 +3215,7 @@ > > > > > > aoss_qmp: power-controller@c300000 { > > > compatible = "qcom,sc7180-aoss-qmp"; > > > - reg = <0 0x0c300000 0 0x100000>; > > > + reg = <0 0x0c300000 0 0x400>; > > > interrupts = <GIC_SPI 389 IRQ_TYPE_EDGE_RISING>; > > > mboxes = <&apss_shared 0>; > > > > > > @@ -3223,6 +3223,11 @@ > > > #power-domain-cells = <1>; > > > }; > > > > > > + rpmh-sleep-stats@c3f0000 { > > > + compatible = "qcom,rpmh-sleep-stats"; > > > + reg = <0 0x0c3f0000 0 0x400>; > > > + }; > > > + > > > > Does this need to be in DT? Can the sc7180-aoss-qmp driver use the > > aux-bus and stick the sleep stats device on there? > > > > The AOSS memory space has N chunks of "message ram", one is used for the > QMP protocol (presumably the APSS specific one), a different one is used > for the sleep stats. > > I presume we could have come up with a binding for the entire AOSS/AOP > and then describe (either implicit or explicitly) the QMP and > debug-stats under that. > > But we'd also have to come up with the same container-device for the RPM > case. Because the rpm node doesn't include this region of memory today? I still fail to see why we're changing the existing binding and adding a DT node for this new region that is basically a debug feature.
On Wed 02 Jun 19:26 CDT 2021, Stephen Boyd wrote: > Quoting Bjorn Andersson (2021-05-31 10:57:03) > > On Wed 26 May 18:30 CDT 2021, Stephen Boyd wrote: > > > > > Quoting Maulik Shah (2021-05-21 04:26:09) > > > > Add device node for SoC sleep stats driver which provides various > > > > low power mode stats. > > > > > > > > Also update the reg size of aoss_qmp device to 0x400. > > > > > > > > Cc: devicetree@vger.kernel.org > > > > Signed-off-by: Maulik Shah <mkshah@codeaurora.org> > > > > Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> > > > > --- > > > > arch/arm64/boot/dts/qcom/sc7180.dtsi | 7 ++++++- > > > > 1 file changed, 6 insertions(+), 1 deletion(-) > > > > > > > > diff --git a/arch/arm64/boot/dts/qcom/sc7180.dtsi b/arch/arm64/boot/dts/qcom/sc7180.dtsi > > > > index 6228ba2..889d04d 100644 > > > > --- a/arch/arm64/boot/dts/qcom/sc7180.dtsi > > > > +++ b/arch/arm64/boot/dts/qcom/sc7180.dtsi > > > > @@ -3215,7 +3215,7 @@ > > > > > > > > aoss_qmp: power-controller@c300000 { > > > > compatible = "qcom,sc7180-aoss-qmp"; > > > > - reg = <0 0x0c300000 0 0x100000>; > > > > + reg = <0 0x0c300000 0 0x400>; > > > > interrupts = <GIC_SPI 389 IRQ_TYPE_EDGE_RISING>; > > > > mboxes = <&apss_shared 0>; > > > > > > > > @@ -3223,6 +3223,11 @@ > > > > #power-domain-cells = <1>; > > > > }; > > > > > > > > + rpmh-sleep-stats@c3f0000 { > > > > + compatible = "qcom,rpmh-sleep-stats"; > > > > + reg = <0 0x0c3f0000 0 0x400>; > > > > + }; > > > > + > > > > > > Does this need to be in DT? Can the sc7180-aoss-qmp driver use the > > > aux-bus and stick the sleep stats device on there? > > > > > > > The AOSS memory space has N chunks of "message ram", one is used for the > > QMP protocol (presumably the APSS specific one), a different one is used > > for the sleep stats. > > > > I presume we could have come up with a binding for the entire AOSS/AOP > > and then describe (either implicit or explicitly) the QMP and > > debug-stats under that. > > > > But we'd also have to come up with the same container-device for the RPM > > case. > > Because the rpm node doesn't include this region of memory today? I > still fail to see why we're changing the existing binding and adding a > DT node for this new region that is basically a debug feature. We're not changing the binding, the memory region for the "AOSS QMP" thing was never larger than 0x400. 0x100000 is the size of all the AOSS "msg_ram" regions. We don't have this whole thing described in a binding and we don't have an implementation for the whole thing. If we're going for that we'd need to extend the binding to indicate which of the msg_ram regions are used for APSS QMP and for debug stats on particular platform (either by compatible, explicit properties or as some subnodes). That said, as I looked into my other objection, for the RPM (non-hardened) case it seems that we're actually describing the RPM region. So there it would make sense to describe it as such in DT - but we don't have any other code (that I'm aware of) that would implement the "qcom,<platform>-rpm". Regards, Bjorn
Quoting Bjorn Andersson (2021-06-02 19:44:40) > On Wed 02 Jun 19:26 CDT 2021, Stephen Boyd wrote: > > > Quoting Bjorn Andersson (2021-05-31 10:57:03) > > > On Wed 26 May 18:30 CDT 2021, Stephen Boyd wrote: > > > > > > > Quoting Maulik Shah (2021-05-21 04:26:09) > > > > > @@ -3223,6 +3223,11 @@ > > > > > #power-domain-cells = <1>; > > > > > }; > > > > > > > > > > + rpmh-sleep-stats@c3f0000 { > > > > > + compatible = "qcom,rpmh-sleep-stats"; > > > > > + reg = <0 0x0c3f0000 0 0x400>; > > > > > + }; > > > > > + > > > > > > > > Does this need to be in DT? Can the sc7180-aoss-qmp driver use the > > > > aux-bus and stick the sleep stats device on there? > > > > > > > > > > The AOSS memory space has N chunks of "message ram", one is used for the > > > QMP protocol (presumably the APSS specific one), a different one is used > > > for the sleep stats. > > > > > > I presume we could have come up with a binding for the entire AOSS/AOP > > > and then describe (either implicit or explicitly) the QMP and > > > debug-stats under that. > > > > > > But we'd also have to come up with the same container-device for the RPM > > > case. > > > > Because the rpm node doesn't include this region of memory today? I > > still fail to see why we're changing the existing binding and adding a > > DT node for this new region that is basically a debug feature. > > We're not changing the binding, the memory region for the "AOSS QMP" > thing was never larger than 0x400. > > 0x100000 is the size of all the AOSS "msg_ram" regions. We don't have > this whole thing described in a binding and we don't have an > implementation for the whole thing. > > If we're going for that we'd need to extend the binding to indicate > which of the msg_ram regions are used for APSS QMP and for debug stats > on particular platform (either by compatible, explicit properties or as > some subnodes). Fair enough. At the least, can we change the name of the node then to 'sram' or 'ram'? The 'rpmh-sleep-stats' node name is nonsense. > > > That said, as I looked into my other objection, for the RPM > (non-hardened) case it seems that we're actually describing the RPM > region. So there it would make sense to describe it as such in DT - but > we don't have any other code (that I'm aware of) that would implement > the "qcom,<platform>-rpm". > I only half parsed this part. Are you saying that because we don't have a driver for qcom,<platform>-rpm we shouldn't keep it all within the rpm node?
On Fri 04 Jun 16:53 CDT 2021, Stephen Boyd wrote: > Quoting Bjorn Andersson (2021-06-02 19:44:40) > > On Wed 02 Jun 19:26 CDT 2021, Stephen Boyd wrote: > > > > > Quoting Bjorn Andersson (2021-05-31 10:57:03) > > > > On Wed 26 May 18:30 CDT 2021, Stephen Boyd wrote: > > > > > > > > > Quoting Maulik Shah (2021-05-21 04:26:09) > > > > > > @@ -3223,6 +3223,11 @@ > > > > > > #power-domain-cells = <1>; > > > > > > }; > > > > > > > > > > > > + rpmh-sleep-stats@c3f0000 { > > > > > > + compatible = "qcom,rpmh-sleep-stats"; > > > > > > + reg = <0 0x0c3f0000 0 0x400>; > > > > > > + }; > > > > > > + > > > > > > > > > > Does this need to be in DT? Can the sc7180-aoss-qmp driver use the > > > > > aux-bus and stick the sleep stats device on there? > > > > > > > > > > > > > The AOSS memory space has N chunks of "message ram", one is used for the > > > > QMP protocol (presumably the APSS specific one), a different one is used > > > > for the sleep stats. > > > > > > > > I presume we could have come up with a binding for the entire AOSS/AOP > > > > and then describe (either implicit or explicitly) the QMP and > > > > debug-stats under that. > > > > > > > > But we'd also have to come up with the same container-device for the RPM > > > > case. > > > > > > Because the rpm node doesn't include this region of memory today? I > > > still fail to see why we're changing the existing binding and adding a > > > DT node for this new region that is basically a debug feature. > > > > We're not changing the binding, the memory region for the "AOSS QMP" > > thing was never larger than 0x400. > > > > 0x100000 is the size of all the AOSS "msg_ram" regions. We don't have > > this whole thing described in a binding and we don't have an > > implementation for the whole thing. > > > > If we're going for that we'd need to extend the binding to indicate > > which of the msg_ram regions are used for APSS QMP and for debug stats > > on particular platform (either by compatible, explicit properties or as > > some subnodes). > > Fair enough. At the least, can we change the name of the node then to > 'sram' or 'ram'? The 'rpmh-sleep-stats' node name is nonsense. > Yes, "ram" sounds like a better node name for both the qmp and sleep-stats region - in the RPMH case. > > > > > > That said, as I looked into my other objection, for the RPM > > (non-hardened) case it seems that we're actually describing the RPM > > region. So there it would make sense to describe it as such in DT - but > > we don't have any other code (that I'm aware of) that would implement > > the "qcom,<platform>-rpm". > > > > I only half parsed this part. Are you saying that because we don't have > a driver for qcom,<platform>-rpm we shouldn't keep it all within the rpm > node? What I was trying to say is that in the RPM (non-H) case the described memory region is not a chunk of "ram" (or "sram"), but seems to rather be the RPM region. So there it seems more reasonable to have a non-debug compatible, but I don't think we have any other use for it than the debug-stats... Regards, Bjorn
diff --git a/arch/arm64/boot/dts/qcom/sc7180.dtsi b/arch/arm64/boot/dts/qcom/sc7180.dtsi index 6228ba2..889d04d 100644 --- a/arch/arm64/boot/dts/qcom/sc7180.dtsi +++ b/arch/arm64/boot/dts/qcom/sc7180.dtsi @@ -3215,7 +3215,7 @@ aoss_qmp: power-controller@c300000 { compatible = "qcom,sc7180-aoss-qmp"; - reg = <0 0x0c300000 0 0x100000>; + reg = <0 0x0c300000 0 0x400>; interrupts = <GIC_SPI 389 IRQ_TYPE_EDGE_RISING>; mboxes = <&apss_shared 0>; @@ -3223,6 +3223,11 @@ #power-domain-cells = <1>; }; + rpmh-sleep-stats@c3f0000 { + compatible = "qcom,rpmh-sleep-stats"; + reg = <0 0x0c3f0000 0 0x400>; + }; + spmi_bus: spmi@c440000 { compatible = "qcom,spmi-pmic-arb"; reg = <0 0x0c440000 0 0x1100>,