From: Johnson Wang <johnson.wang@mediatek.com> To: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>, <robh+dt@kernel.org>, <krzysztof.kozlowski+dt@linaro.org>, <sboyd@kernel.org> Cc: <linux-clk@vger.kernel.org>, <linux-kernel@vger.kernel.org>, <devicetree@vger.kernel.org>, <linux-arm-kernel@lists.infradead.org>, <linux-mediatek@lists.infradead.org>, <Project_Global_Chrome_Upstream_Group@mediatek.com>, Edward-JW Yang <edward-jw.yang@mediatek.com> Subject: Re: [PATCH v2 2/4] dt-bindings: arm: mediatek: Add new bindings of MediaTek frequency hopping Date: Thu, 15 Sep 2022 12:00:40 +0800 [thread overview] Message-ID: <47ad92dfc593681508fcf09df1303cdfe86c4202.camel@mediatek.com> (raw) In-Reply-To: <06eb15ea-56b3-4f18-be18-3fc710cef779@collabora.com> Hi Angelo, Thanks for your review. On Wed, 2022-09-14 at 15:46 +0200, AngeloGioacchino Del Regno wrote: > Il 14/09/22 14:45, Johnson Wang ha scritto: > > Add the new binding documentation for MediaTek frequency hopping > > and spread spectrum clocking control. > > > > Co-developed-by: Edward-JW Yang <edward-jw.yang@mediatek.com> > > Signed-off-by: Edward-JW Yang <edward-jw.yang@mediatek.com> > > Signed-off-by: Johnson Wang <johnson.wang@mediatek.com> > > --- > > .../bindings/arm/mediatek/mediatek,fhctl.yaml | 47 > > +++++++++++++++++++ > > 1 file changed, 47 insertions(+) > > create mode 100644 > > Documentation/devicetree/bindings/arm/mediatek/mediatek,fhctl.yaml > > > > diff --git > > a/Documentation/devicetree/bindings/arm/mediatek/mediatek,fhctl.yam > > l > > b/Documentation/devicetree/bindings/arm/mediatek/mediatek,fhctl.yam > > l > > new file mode 100644 > > index 000000000000..7b0fd0889bb6 > > --- /dev/null > > +++ > > b/Documentation/devicetree/bindings/arm/mediatek/mediatek,fhctl.yam > > l > > @@ -0,0 +1,47 @@ > > +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) > > +%YAML 1.2 > > +--- > > +$id: > > https://urldefense.com/v3/__http://devicetree.org/schemas/arm/mediatek/mediatek,fhctl.yaml*__;Iw!!CTRNKA9wMg0ARbw!3sumdhtrK5Ah5_rfIilgm4UUmnwkkqMpc3r_ZfkLfsXsLn-_AKm9ZokhJGD1Fl-gJpckAKHZh-jNVW64KRU8Duv1kg$ > > > > +$schema: > > https://urldefense.com/v3/__http://devicetree.org/meta-schemas/core.yaml*__;Iw!!CTRNKA9wMg0ARbw!3sumdhtrK5Ah5_rfIilgm4UUmnwkkqMpc3r_ZfkLfsXsLn-_AKm9ZokhJGD1Fl-gJpckAKHZh-jNVW64KRWMb8jIsw$ > > > > + > > +title: MediaTek frequency hopping and spread spectrum clocking > > control > > + > > +maintainers: > > + - Edward-JW Yang <edward-jw.yang@mediatek.com> > > + > > +description: | > > + Frequency hopping control (FHCTL) is a piece of hardware that > > control > > + some PLLs to adopt "hopping" mechanism to adjust their > > frequency. > > + Spread spectrum clocking (SSC) is another function provided by > > this hardware. > > + > > +properties: > > + compatible: > > + const: mediatek,mt8186-fhctl > > + > > + reg: > > + maxItems: 1 > > There are still a few issues in this binding that I can immediately > see... > > > + > > + clocks: > > MT8195 has 23 PLLs, MT8186 has 14, but perhaps in the future we may > see > something more than that on some newer SoC, so... > > clocks: > maxItems: 30 May I add "minItems: 1" to clocks property? Without this, dt_binding_check will fail because we don't have enough clocks in the example. (Both MT8195 and MT8186 don't have 30 PLLs) > > > + description: Phandles of the PLL with FHCTL hardware > > capability. > > + > > + mediatek,hopping-ssc-percents: > > + description: The percentage of spread spectrum clocking for > > one PLL. > > + $ref: /schemas/types.yaml#/definitions/uint32 > > This is an array, so... > $ref: /schemas/types.yaml#/definitions/uint32-array > > ...also, maxItems? As you know, mediatek,hopping-ssc-percents property is used to specify ssc rate for matching clocks. If we have to add maxItems, I think we should specify the same value as clocks property. Is my understanding wrong? Thanks! BRs, Johnson Wang > > and you should also specify: > > default: 0 <- because, by default, SSC is disabled > minimum: 0 <- because this is the minimum accepted value > > > Regards, > Angelo > > > + maximum: 8 > > + > > +required: > > + - compatible > > + - reg > > + - clocks > > + > > +additionalProperties: false > > + > > +examples: > > + - | > > + #include <dt-bindings/clock/mt8186-clk.h> > > + fhctl: fhctl@1000ce00 { > > + compatible = "mediatek,mt8186-fhctl"; > > + reg = <0x1000c000 0xe00>; > > + clocks = <&apmixedsys CLK_APMIXED_MSDCPLL>; > > + mediatek,hopping-ssc-percents = <3>; > > + }; > >
WARNING: multiple messages have this Message-ID (diff)
From: Johnson Wang <johnson.wang@mediatek.com> To: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>, <robh+dt@kernel.org>, <krzysztof.kozlowski+dt@linaro.org>, <sboyd@kernel.org> Cc: <linux-clk@vger.kernel.org>, <linux-kernel@vger.kernel.org>, <devicetree@vger.kernel.org>, <linux-arm-kernel@lists.infradead.org>, <linux-mediatek@lists.infradead.org>, <Project_Global_Chrome_Upstream_Group@mediatek.com>, Edward-JW Yang <edward-jw.yang@mediatek.com> Subject: Re: [PATCH v2 2/4] dt-bindings: arm: mediatek: Add new bindings of MediaTek frequency hopping Date: Thu, 15 Sep 2022 12:00:40 +0800 [thread overview] Message-ID: <47ad92dfc593681508fcf09df1303cdfe86c4202.camel@mediatek.com> (raw) In-Reply-To: <06eb15ea-56b3-4f18-be18-3fc710cef779@collabora.com> Hi Angelo, Thanks for your review. On Wed, 2022-09-14 at 15:46 +0200, AngeloGioacchino Del Regno wrote: > Il 14/09/22 14:45, Johnson Wang ha scritto: > > Add the new binding documentation for MediaTek frequency hopping > > and spread spectrum clocking control. > > > > Co-developed-by: Edward-JW Yang <edward-jw.yang@mediatek.com> > > Signed-off-by: Edward-JW Yang <edward-jw.yang@mediatek.com> > > Signed-off-by: Johnson Wang <johnson.wang@mediatek.com> > > --- > > .../bindings/arm/mediatek/mediatek,fhctl.yaml | 47 > > +++++++++++++++++++ > > 1 file changed, 47 insertions(+) > > create mode 100644 > > Documentation/devicetree/bindings/arm/mediatek/mediatek,fhctl.yaml > > > > diff --git > > a/Documentation/devicetree/bindings/arm/mediatek/mediatek,fhctl.yam > > l > > b/Documentation/devicetree/bindings/arm/mediatek/mediatek,fhctl.yam > > l > > new file mode 100644 > > index 000000000000..7b0fd0889bb6 > > --- /dev/null > > +++ > > b/Documentation/devicetree/bindings/arm/mediatek/mediatek,fhctl.yam > > l > > @@ -0,0 +1,47 @@ > > +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) > > +%YAML 1.2 > > +--- > > +$id: > > https://urldefense.com/v3/__http://devicetree.org/schemas/arm/mediatek/mediatek,fhctl.yaml*__;Iw!!CTRNKA9wMg0ARbw!3sumdhtrK5Ah5_rfIilgm4UUmnwkkqMpc3r_ZfkLfsXsLn-_AKm9ZokhJGD1Fl-gJpckAKHZh-jNVW64KRU8Duv1kg$ > > > > +$schema: > > https://urldefense.com/v3/__http://devicetree.org/meta-schemas/core.yaml*__;Iw!!CTRNKA9wMg0ARbw!3sumdhtrK5Ah5_rfIilgm4UUmnwkkqMpc3r_ZfkLfsXsLn-_AKm9ZokhJGD1Fl-gJpckAKHZh-jNVW64KRWMb8jIsw$ > > > > + > > +title: MediaTek frequency hopping and spread spectrum clocking > > control > > + > > +maintainers: > > + - Edward-JW Yang <edward-jw.yang@mediatek.com> > > + > > +description: | > > + Frequency hopping control (FHCTL) is a piece of hardware that > > control > > + some PLLs to adopt "hopping" mechanism to adjust their > > frequency. > > + Spread spectrum clocking (SSC) is another function provided by > > this hardware. > > + > > +properties: > > + compatible: > > + const: mediatek,mt8186-fhctl > > + > > + reg: > > + maxItems: 1 > > There are still a few issues in this binding that I can immediately > see... > > > + > > + clocks: > > MT8195 has 23 PLLs, MT8186 has 14, but perhaps in the future we may > see > something more than that on some newer SoC, so... > > clocks: > maxItems: 30 May I add "minItems: 1" to clocks property? Without this, dt_binding_check will fail because we don't have enough clocks in the example. (Both MT8195 and MT8186 don't have 30 PLLs) > > > + description: Phandles of the PLL with FHCTL hardware > > capability. > > + > > + mediatek,hopping-ssc-percents: > > + description: The percentage of spread spectrum clocking for > > one PLL. > > + $ref: /schemas/types.yaml#/definitions/uint32 > > This is an array, so... > $ref: /schemas/types.yaml#/definitions/uint32-array > > ...also, maxItems? As you know, mediatek,hopping-ssc-percents property is used to specify ssc rate for matching clocks. If we have to add maxItems, I think we should specify the same value as clocks property. Is my understanding wrong? Thanks! BRs, Johnson Wang > > and you should also specify: > > default: 0 <- because, by default, SSC is disabled > minimum: 0 <- because this is the minimum accepted value > > > Regards, > Angelo > > > + maximum: 8 > > + > > +required: > > + - compatible > > + - reg > > + - clocks > > + > > +additionalProperties: false > > + > > +examples: > > + - | > > + #include <dt-bindings/clock/mt8186-clk.h> > > + fhctl: fhctl@1000ce00 { > > + compatible = "mediatek,mt8186-fhctl"; > > + reg = <0x1000c000 0xe00>; > > + clocks = <&apmixedsys CLK_APMIXED_MSDCPLL>; > > + mediatek,hopping-ssc-percents = <3>; > > + }; > > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2022-09-15 4:00 UTC|newest] Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-09-14 12:45 [PATCH v2 0/4] Introduce MediaTek frequency hopping driver Johnson Wang 2022-09-14 12:45 ` Johnson Wang 2022-09-14 12:45 ` [PATCH v2 1/4] clk: mediatek: Export PLL operations symbols Johnson Wang 2022-09-14 12:45 ` Johnson Wang 2022-09-14 12:45 ` [PATCH v2 2/4] dt-bindings: arm: mediatek: Add new bindings of MediaTek frequency hopping Johnson Wang 2022-09-14 12:45 ` Johnson Wang 2022-09-14 13:46 ` AngeloGioacchino Del Regno 2022-09-14 13:46 ` AngeloGioacchino Del Regno 2022-09-15 4:00 ` Johnson Wang [this message] 2022-09-15 4:00 ` Johnson Wang 2022-09-15 6:56 ` AngeloGioacchino Del Regno 2022-09-15 6:56 ` AngeloGioacchino Del Regno 2022-09-18 9:38 ` Krzysztof Kozlowski 2022-09-18 9:38 ` Krzysztof Kozlowski 2022-09-28 6:18 ` Johnson Wang (王聖鑫) 2022-09-28 6:18 ` Johnson Wang (王聖鑫) 2022-09-14 12:45 ` [PATCH v2 3/4] clk: mediatek: Add new clock driver to handle FHCTL hardware Johnson Wang 2022-09-14 12:45 ` Johnson Wang 2022-09-27 10:56 ` Edward-JW Yang 2022-09-27 10:56 ` Edward-JW Yang 2022-09-28 6:18 ` Johnson Wang (王聖鑫) 2022-09-28 6:18 ` Johnson Wang (王聖鑫) 2022-09-14 12:45 ` [PATCH v2 4/4] clk: mediatek: Change PLL register API for MT8186 Johnson Wang 2022-09-14 12:45 ` Johnson Wang
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