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Message-ID: <eecc5d38-f6ab-b1ea-1a08-0afb2dcddbef@samsung.com>
Date: Mon, 16 Dec 2019 11:59:17 +0900
From: Chanwoo Choi <cw00.choi@...sung.com>
To: Artur Świgoń <a.swigon@...sung.com>,
devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-pm@...r.kernel.org, dri-devel@...ts.freedesktop.org
Cc: myungjoo.ham@...sung.com, inki.dae@...sung.com,
sw0312.kim@...sung.com, georgi.djakov@...aro.org,
leonard.crestez@....com, m.szyprowski@...sung.com,
b.zolnierkie@...sung.com, krzk@...nel.org
Subject: Re: [RFC PATCH v2 08/11] arm: dts: exynos: Add parents and
#interconnect-cells to Exynos4412
Hi,
On 12/16/19 9:51 AM, Chanwoo Choi wrote:
> On 9/19/19 11:22 PM, Artur Świgoń wrote:
>> From: Artur Świgoń <a.swigon@...tner.samsung.com>
>>
>> This patch adds two fields to the Exynos4412 DTS:
>> - parent: to declare connections between nodes that are not in a
>> parent-child relation in devfreq;
>> - #interconnect-cells: required by the interconnect framework.
>>
>> Please note that #interconnect-cells is always zero and node IDs are not
>> hardcoded anywhere. The above-mentioned parent-child relation in devfreq
>> means that there is a shared power line ('devfreq' property). The 'parent'
>> property only signifies an interconnect connection.
>>
>> Signed-off-by: Artur Świgoń <a.swigon@...tner.samsung.com>
>> ---
>> arch/arm/boot/dts/exynos4412-odroid-common.dtsi | 1 +
>> arch/arm/boot/dts/exynos4412.dtsi | 9 +++++++++
>> 2 files changed, 10 insertions(+)
>>
>> diff --git a/arch/arm/boot/dts/exynos4412-odroid-common.dtsi b/arch/arm/boot/dts/exynos4412-odroid-common.dtsi
>> index ea55f377d17c..bdd61ae86103 100644
>> --- a/arch/arm/boot/dts/exynos4412-odroid-common.dtsi
>> +++ b/arch/arm/boot/dts/exynos4412-odroid-common.dtsi
>> @@ -106,6 +106,7 @@
>> &bus_leftbus {
>> devfreq-events = <&ppmu_leftbus_3>, <&ppmu_rightbus_3>;
>> vdd-supply = <&buck3_reg>;
>> + parent = <&bus_dmc>;
>
> As I mentioned on other reply,
> I'm not sure to use the specific 'parent' property to make
> the connection between buses. If possible, you better to
> use the standard way like OF graph. Except for making
> the connection between buses by 'parent' property,
> looks good to me.
I tried to think it continuously. I withdraw the my opinion
using OF graph. If you make the property name like the following
example, it is possible for exynos.
- exynos,interconnect-parent-node = <&bus_dmc>; or other proper name.
Regardless of existing 'devfreq' property, I think you better to
make the connection between buses for only interconnect as following
example: This make it possible user can draw the correct tree by tracking
the 'exynos,interconnect-parent-node' value.
diff --git a/arch/arm/boot/dts/exynos4412-odroid-common.dtsi b/arch/arm/boot/dts/exynos4412-odroid-common.dtsi
index ea55f377d17c..53f87f46e161 100644
--- a/arch/arm/boot/dts/exynos4412-odroid-common.dtsi
+++ b/arch/arm/boot/dts/exynos4412-odroid-common.dtsi
@@ -90,6 +90,7 @@
&bus_dmc {
devfreq-events = <&ppmu_dmc0_3>, <&ppmu_dmc1_3>;
vdd-supply = <&buck1_reg>;
+ #interconnect-cells = <0>;
status = "okay";
};
@@ -106,6 +107,8 @@
&bus_leftbus {
devfreq-events = <&ppmu_leftbus_3>, <&ppmu_rightbus_3>;
vdd-supply = <&buck3_reg>;
+ exynos,interconnect-parent-node = <&bus_dmc>;
+ #interconnect-cells = <0>;
status = "okay";
};
@@ -116,6 +119,8 @@
&bus_display {
devfreq = <&bus_leftbus>;
+ exynos,interconnect-parent-node = <&bus_leftbus>;
+ #interconnect-cells = <0>;
status = "okay";
};
>
>
>> status = "okay";
>> };
>>
>> diff --git a/arch/arm/boot/dts/exynos4412.dtsi b/arch/arm/boot/dts/exynos4412.dtsi
>> index d20db2dfe8e2..a70a671acacd 100644
>> --- a/arch/arm/boot/dts/exynos4412.dtsi
>> +++ b/arch/arm/boot/dts/exynos4412.dtsi
>> @@ -390,6 +390,7 @@
>> clocks = <&clock CLK_DIV_DMC>;
>> clock-names = "bus";
>> operating-points-v2 = <&bus_dmc_opp_table>;
>> + #interconnect-cells = <0>;
>> status = "disabled";
>> };
>>
>> @@ -398,6 +399,7 @@
>> clocks = <&clock CLK_DIV_ACP>;
>> clock-names = "bus";
>> operating-points-v2 = <&bus_acp_opp_table>;
>> + #interconnect-cells = <0>;
>> status = "disabled";
>> };
>>
>> @@ -406,6 +408,7 @@
>> clocks = <&clock CLK_DIV_C2C>;
>> clock-names = "bus";
>> operating-points-v2 = <&bus_dmc_opp_table>;
>> + #interconnect-cells = <0>;
>> status = "disabled";
>> };
>>
>> @@ -459,6 +462,7 @@
>> clocks = <&clock CLK_DIV_GDL>;
>> clock-names = "bus";
>> operating-points-v2 = <&bus_leftbus_opp_table>;
>> + #interconnect-cells = <0>;
>> status = "disabled";
>> };
>>
>> @@ -467,6 +471,7 @@
>> clocks = <&clock CLK_DIV_GDR>;
>> clock-names = "bus";
>> operating-points-v2 = <&bus_leftbus_opp_table>;
>> + #interconnect-cells = <0>;
>> status = "disabled";
>> };
>>
>> @@ -475,6 +480,7 @@
>> clocks = <&clock CLK_ACLK160>;
>> clock-names = "bus";
>> operating-points-v2 = <&bus_display_opp_table>;
>> + #interconnect-cells = <0>;
>> status = "disabled";
>> };
>>
>> @@ -483,6 +489,7 @@
>> clocks = <&clock CLK_ACLK133>;
>> clock-names = "bus";
>> operating-points-v2 = <&bus_fsys_opp_table>;
>> + #interconnect-cells = <0>;
>> status = "disabled";
>> };
>>
>> @@ -491,6 +498,7 @@
>> clocks = <&clock CLK_ACLK100>;
>> clock-names = "bus";
>> operating-points-v2 = <&bus_peri_opp_table>;
>> + #interconnect-cells = <0>;
>> status = "disabled";
>> };
>>
>> @@ -499,6 +507,7 @@
>> clocks = <&clock CLK_SCLK_MFC>;
>> clock-names = "bus";
>> operating-points-v2 = <&bus_leftbus_opp_table>;
>> + #interconnect-cells = <0>;
>> status = "disabled";
>> };
>>
>>
>
>
--
Best Regards,
Chanwoo Choi
Samsung Electronics
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