From: Sylwester Nawrocki <s.nawrocki@samsung.com>
To: georgi.djakov@linaro.org, cw00.choi@samsung.com, krzk@kernel.org
Cc: a.swigon@samsung.com, myungjoo.ham@samsung.com,
inki.dae@samsung.com, sw0312.kim@samsung.com,
b.zolnierkie@samsung.com, m.szyprowski@samsung.com,
s.nawrocki@samsung.com, linux-kernel@vger.kernel.org,
linux-samsung-soc@vger.kernel.org,
dri-devel@lists.freedesktop.org,
linux-arm-kernel@lists.infradead.org
Subject: [RFC PATCH v5 1/6] dt-bindings: exynos-bus: Add documentation for interconnect properties
Date: Fri, 29 May 2020 18:31:55 +0200 [thread overview]
Message-ID: <20200529163200.18031-2-s.nawrocki@samsung.com> (raw)
In-Reply-To: <20200529163200.18031-1-s.nawrocki@samsung.com>
Add documentation for new optional properties in the exynos bus nodes:
samsung,interconnect-parent, #interconnect-cells.
These properties allow to specify the SoC interconnect structure which
then allows the interconnect consumer devices to request specific
bandwidth requirements.
Signed-off-by: Artur Świgoń <a.swigon@samsung.com>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
---
Changes for v5:
- exynos,interconnect-parent-node renamed to samsung,interconnect-parent
---
Documentation/devicetree/bindings/devfreq/exynos-bus.txt | 15 +++++++++++++--
1 file changed, 13 insertions(+), 2 deletions(-)
diff --git a/Documentation/devicetree/bindings/devfreq/exynos-bus.txt b/Documentation/devicetree/bindings/devfreq/exynos-bus.txt
index e71f752..e0d2daa 100644
--- a/Documentation/devicetree/bindings/devfreq/exynos-bus.txt
+++ b/Documentation/devicetree/bindings/devfreq/exynos-bus.txt
@@ -51,6 +51,11 @@ Optional properties only for parent bus device:
- exynos,saturation-ratio: the percentage value which is used to calibrate
the performance count against total cycle count.
+Optional properties for interconnect functionality (QoS frequency constraints):
+- samsung,interconnect-parent: phandle to the parent interconnect node; for
+ passive devices should point to same node as the exynos,parent-bus property.
+- #interconnect-cells: should be 0
+
Detailed correlation between sub-blocks and power line according to Exynos SoC:
- In case of Exynos3250, there are two power line as following:
VDD_MIF |--- DMC
@@ -185,8 +190,9 @@ Example1:
----------------------------------------------------------
Example2 :
- The bus of DMC (Dynamic Memory Controller) block in exynos3250.dtsi
- is listed below:
+ The bus of DMC (Dynamic Memory Controller) block in exynos3250.dtsi is
+ listed below. An interconnect path "bus_lcd0 -- bus_leftbus -- bus_dmc"
+ is defined for demonstration purposes.
bus_dmc: bus_dmc {
compatible = "samsung,exynos-bus";
@@ -376,12 +382,15 @@ Example2 :
&bus_dmc {
devfreq-events = <&ppmu_dmc0_3>, <&ppmu_dmc1_3>;
vdd-supply = <&buck1_reg>; /* VDD_MIF */
+ #interconnect-cells = <0>;
status = "okay";
};
&bus_leftbus {
devfreq-events = <&ppmu_leftbus_3>, <&ppmu_rightbus_3>;
vdd-supply = <&buck3_reg>;
+ samsung,interconnect-parent = <&bus_dmc>;
+ #interconnect-cells = <0>;
status = "okay";
};
@@ -392,6 +401,8 @@ Example2 :
&bus_lcd0 {
devfreq = <&bus_leftbus>;
+ samsung,interconnect-parent = <&bus_leftbus>;
+ #interconnect-cells = <0>;
status = "okay";
};
--
2.7.4
next prev parent reply other threads:[~2020-05-29 16:32 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20200529163213eucas1p1ac148f9238214ac84f3d0cc199c4398b@eucas1p1.samsung.com>
2020-05-29 16:31 ` [RFC PATCH v5 0/6] Exynos: Simple QoS for exynos-bus using interconnect Sylwester Nawrocki
[not found] ` <CGME20200529163219eucas1p2d127fe3936921f53f6fe7902e7d14a3e@eucas1p2.samsung.com>
2020-05-29 16:31 ` Sylwester Nawrocki [this message]
2020-05-31 0:01 ` [RFC PATCH v5 1/6] dt-bindings: exynos-bus: Add documentation for interconnect properties Chanwoo Choi
2020-06-01 9:40 ` Sylwester Nawrocki
2020-06-01 8:19 ` Sylwester Nawrocki
2020-06-02 8:05 ` Krzysztof Kozlowski
[not found] ` <CGME20200529163223eucas1p2f663280abb499b4114b2f2930b43a4e5@eucas1p2.samsung.com>
2020-05-29 16:31 ` [RFC PATCH v5 2/6] interconnect: Add generic interconnect driver for Exynos SoCs Sylwester Nawrocki
2020-05-31 0:13 ` Chanwoo Choi
2020-06-01 9:57 ` Sylwester Nawrocki
2020-06-02 8:21 ` Krzysztof Kozlowski
2020-06-03 9:24 ` Sylwester Nawrocki
2020-07-01 12:50 ` Georgi Djakov
2020-07-02 12:01 ` Sylwester Nawrocki
2020-07-02 12:33 ` Georgi Djakov
2020-07-02 14:24 ` Sylwester Nawrocki
[not found] ` <CGME20200529163225eucas1p1cfb2233c869dcc3dab84b754bbce17b6@eucas1p1.samsung.com>
2020-05-29 16:31 ` [RFC PATCH v5 3/6] PM / devfreq: exynos-bus: Add registration of interconnect child device Sylwester Nawrocki
2020-05-30 23:57 ` Chanwoo Choi
2020-06-01 10:04 ` Sylwester Nawrocki
2020-06-02 0:50 ` Chanwoo Choi
[not found] ` <CGME20200529163226eucas1p15bea74bed9cc5d22727c9ba732a5cbb9@eucas1p1.samsung.com>
2020-05-29 16:31 ` [RFC PATCH v5 4/6] ARM: dts: exynos: Add interconnect properties to Exynos4412 bus nodes Sylwester Nawrocki
2020-05-31 0:02 ` Chanwoo Choi
[not found] ` <CGME20200529163228eucas1p1d05340fef9ffc724f5d3d9f5709a600f@eucas1p1.samsung.com>
2020-05-29 16:31 ` [RFC PATCH v5 5/6] ARM: dts: exynos: Add interconnects to Exynos4412 mixer Sylwester Nawrocki
2020-05-31 0:07 ` Chanwoo Choi
[not found] ` <CGME20200529163229eucas1p2ee6394f184e5eba12599559f8a621fde@eucas1p2.samsung.com>
2020-05-29 16:32 ` [RFC PATCH v5 6/6] drm: exynos: mixer: Add interconnect support Sylwester Nawrocki
2020-06-01 7:58 ` Chanwoo Choi
2020-06-03 10:04 ` Sylwester Nawrocki
2020-06-01 8:17 ` [RFC PATCH v5 0/6] Exynos: Simple QoS for exynos-bus using interconnect Sylwester Nawrocki
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