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Fri, 10 Jul 2020 09:33:41 +0200 Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 43017100038; Fri, 10 Jul 2020 09:33:41 +0200 (CEST) Received: from Webmail-eu.st.com (sfhdag5node2.st.com [10.75.127.14]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id 2B6422A5AFE; Fri, 10 Jul 2020 09:33:41 +0200 (CEST) Received: from SFHDAG3NODE3.st.com (10.75.127.9) by SFHDAG5NODE2.st.com (10.75.127.14) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Fri, 10 Jul 2020 09:33:40 +0200 Received: from SFHDAG3NODE3.st.com ([fe80::3507:b372:7648:476]) by SFHDAG3NODE3.st.com ([fe80::3507:b372:7648:476%20]) with mapi id 15.00.1347.000; Fri, 10 Jul 2020 09:33:40 +0200 From: Benjamin GAIGNARD To: Rob Herring Subject: Re: [PATCH v7 1/3] dt-bindings: media: stm32-dcmi: Add DCMI min frequency property Thread-Topic: [PATCH v7 1/3] dt-bindings: media: stm32-dcmi: Add DCMI min frequency property Thread-Index: AQHWT6e/b2wyFUUnLkaf//MXpHPgJqj/oKMAgAC3YwA= Date: Fri, 10 Jul 2020 07:33:40 +0000 Message-ID: <20e4907a-f218-3e43-1111-7d4b9ee6d945@st.com> References: <20200701130129.30961-1-benjamin.gaignard@st.com> <20200701130129.30961-2-benjamin.gaignard@st.com> <20200709203718.GA837160@bogus> In-Reply-To: <20200709203718.GA837160@bogus> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Mozilla/5.0 (X11; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 7/9/20 10:37 PM, Rob Herring wrote: > On Wed, Jul 01, 2020 at 03:01:27PM +0200, Benjamin Gaignard wrote: >> Document st,stm32-dcmi-min-frequency property which is used to >> request CPUs minimum frequency when streaming frames. >> >> Signed-off-by: Benjamin Gaignard >> --- >> Documentation/devicetree/bindings/media/st,stm32-dcmi.yaml | 8 ++++++++ >> 1 file changed, 8 insertions(+) >> >> diff --git a/Documentation/devicetree/bindings/media/st,stm32-dcmi.yaml b/Documentation/devicetree/bindings/media/st,stm32-dcmi.yaml >> index 3fe778cb5cc3..05ca85a2411a 100644 >> --- a/Documentation/devicetree/bindings/media/st,stm32-dcmi.yaml >> +++ b/Documentation/devicetree/bindings/media/st,stm32-dcmi.yaml >> @@ -44,6 +44,13 @@ properties: >> bindings defined in >> Documentation/devicetree/bindings/media/video-interfaces.txt. >> >> + st,stm32-dcmi-min-frequency: >> + description: DCMI minimum CPUs frequency requirement (in KHz). >> + allOf: >> + - $ref: /schemas/types.yaml#/definitions/uint32 >> + - minimum: 0 >> + - default: 0 > I think this is questionable to be in DT and if it is, it's something > that's hardly specific to ST or this block. IIRC, we already have a way > to specify minimum OPPs. This binding is only needed on some STM32 SoC when DVFS is activated with low frequency setting in opp. The value also depends of the targeted video format and framerate. It is not an opp because it doesn't define a voltage-current-frequency combination but only set a minimum target for the CPUs frequency to guaranty a good reaction time when handling IRQs for the sensor. Benjamin > > Rob _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel