From: Sylwester Nawrocki <s.nawrocki@samsung.com>
To: Rob Herring <robh@kernel.org>, georgi.djakov@linaro.org
Cc: cw00.choi@samsung.com, krzk@kernel.org,
devicetree@vger.kernel.org, a.swigon@samsung.com,
myungjoo.ham@samsung.com, inki.dae@samsung.com,
sw0312.kim@samsung.com, b.zolnierkie@samsung.com,
m.szyprowski@samsung.com, linux-kernel@vger.kernel.org,
linux-pm@vger.kernel.org, linux-samsung-soc@vger.kernel.org,
dri-devel@lists.freedesktop.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH RFC v6 1/6] dt-bindings: exynos-bus: Add documentation for interconnect properties
Date: Fri, 28 Aug 2020 16:49:33 +0200 [thread overview]
Message-ID: <35d9d396-b553-a815-1f3b-1af4dc37a2ca@samsung.com> (raw)
In-Reply-To: <65af1a5c-8f8a-ef65-07f8-e0b3d04c336c@samsung.com>
On 30.07.2020 14:28, Sylwester Nawrocki wrote:
> On 09.07.2020 23:04, Rob Herring wrote:
>> On Thu, Jul 02, 2020 at 06:37:19PM +0200, Sylwester Nawrocki wrote:
>>> Add documentation for new optional properties in the exynos bus nodes:
>>> samsung,interconnect-parent, #interconnect-cells, bus-width.
>>> 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>
>>> --- a/Documentation/devicetree/bindings/devfreq/exynos-bus.txt
>>> +++ b/Documentation/devicetree/bindings/devfreq/exynos-bus.txt
>>> @@ -51,6 +51,13 @@ 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.
>> Adding vendor specific properties for a common binding defeats the
>> point.
Actually we could do without any new property if we used existing interconnect
consumers binding to specify linking between the provider nodes. I think those
exynos-bus nodes could well be considered both the interconnect providers
and consumers. The example would then be something along the lines
(yes, I know the bus node naming needs to be fixed):
soc {
bus_dmc: bus_dmc {
compatible = "samsung,exynos-bus";
/* ... */
samsung,data-clock-ratio = <4>;
#interconnect-cells = <0>;
};
bus_leftbus: bus_leftbus {
compatible = "samsung,exynos-bus";
/* ... */
interconnects = <&bus_leftbus &bus_dmc>;
#interconnect-cells = <0>;
};
bus_display: bus_display {
compatible = "samsung,exynos-bus";
/* ... */
interconnects = <&bus_display &bus_leftbus>;
#interconnect-cells = <0>;
};
&mixer {
compatible = "samsung,exynos4212-mixer";
interconnects = <&bus_display &bus_dmc>;
/* ... */
};
};
What do you think, Georgi, Rob?
--
Regards
Sylwester
next prev parent reply other threads:[~2020-08-28 14:49 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20200702163746eucas1p2363251b3b6fb6084123cedd67fa132d5@eucas1p2.samsung.com>
2020-07-02 16:37 ` [PATCH RFC v6 0/6] Exynos: Simple QoS for exynos-bus using interconnect Sylwester Nawrocki
[not found] ` <CGME20200702163748eucas1p2cf7eab70bc072dea9a95183018b38ad3@eucas1p2.samsung.com>
2020-07-02 16:37 ` [PATCH RFC v6 1/6] dt-bindings: exynos-bus: Add documentation for interconnect properties Sylwester Nawrocki
2020-07-03 0:47 ` Chanwoo Choi
2020-07-09 21:04 ` Rob Herring
2020-07-30 12:28 ` Sylwester Nawrocki
2020-08-28 14:49 ` Sylwester Nawrocki [this message]
2020-09-09 9:07 ` Georgi Djakov
2020-09-09 14:47 ` Sylwester Nawrocki
2020-09-15 21:40 ` Georgi Djakov
2020-10-30 12:29 ` Sylwester Nawrocki
[not found] ` <CGME20200702163753eucas1p16fbd5d59d05fb8e4fdcde9df839cb71e@eucas1p1.samsung.com>
2020-07-02 16:37 ` [PATCH RFC v6 2/6] interconnect: Add generic interconnect driver for Exynos SoCs Sylwester Nawrocki
[not found] ` <CGME20200702163754eucas1p2bbe44897234a3e39dcd10b23e536a927@eucas1p2.samsung.com>
2020-07-02 16:37 ` [PATCH RFC v6 3/6] PM / devfreq: exynos-bus: Add registration of interconnect child device Sylwester Nawrocki
[not found] ` <CGME20200702163756eucas1p282c6bc5a61f8dd7b6a5d59d92e92e2f1@eucas1p2.samsung.com>
2020-07-02 16:37 ` [PATCH RFC v6 4/6] ARM: dts: exynos: Add interconnect properties to Exynos4412 bus nodes Sylwester Nawrocki
[not found] ` <CGME20200702163758eucas1p1e18d95f3dce34df1f4334da5462a04a2@eucas1p1.samsung.com>
2020-07-02 16:37 ` [PATCH RFC v6 5/6] ARM: dts: exynos: Add interconnects to Exynos4412 mixer Sylwester Nawrocki
[not found] ` <CGME20200702163801eucas1p12db276c7ac9e244e93e4b2f3d33ba729@eucas1p1.samsung.com>
2020-07-02 16:37 ` [PATCH RFC v6 6/6] drm: exynos: mixer: Add interconnect support Sylwester Nawrocki
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