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From: Rob Herring <robh@kernel.org>
To: qii.wang@mediatek.com
Cc: matthias.bgg@gmail.com, wsa@the-dreams.de,
	devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org,
	srv_heupstream@mediatek.com, leilk.liu@mediatek.com
Subject: Re: [PATCH] dt-bindings: i2c: Add device clock-stretch time via dts
Date: Wed, 24 Mar 2021 11:12:17 -0600	[thread overview]
Message-ID: <20210324171217.GA3262580@robh.at.kernel.org> (raw)
In-Reply-To: <1615622829-15167-1-git-send-email-qii.wang@mediatek.com>

On Sat, Mar 13, 2021 at 04:07:09PM +0800, qii.wang@mediatek.com wrote:
> From: Qii Wang <qii.wang@mediatek.com>
> 
> tSU,STA/tHD,STA/tSU,STOP maybe out of spec due to device
> clock-stretching or circuit loss, we could get device
> clock-stretch time from dts to adjust these parameters
> to meet the spec via EXT_CONF register.
> 
> Signed-off-by: Qii Wang <qii.wang@mediatek.com>
> ---
>  Documentation/devicetree/bindings/i2c/i2c-mt65xx.txt | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/Documentation/devicetree/bindings/i2c/i2c-mt65xx.txt b/Documentation/devicetree/bindings/i2c/i2c-mt65xx.txt
> index 7f0194f..97f66f0 100644
> --- a/Documentation/devicetree/bindings/i2c/i2c-mt65xx.txt
> +++ b/Documentation/devicetree/bindings/i2c/i2c-mt65xx.txt
> @@ -32,6 +32,7 @@ Optional properties:
>    - mediatek,have-pmic: platform can control i2c form special pmic side.
>      Only mt6589 and mt8135 support this feature.
>    - mediatek,use-push-pull: IO config use push-pull mode.
> +  - clock-stretch-ns: Slave device clock-stretch time.

Should be a common I2C property?

>  
>  Example:
>  
> -- 
> 1.9.1
> 

WARNING: multiple messages have this Message-ID (diff)
From: Rob Herring <robh@kernel.org>
To: qii.wang@mediatek.com
Cc: matthias.bgg@gmail.com, wsa@the-dreams.de,
	devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org,
	srv_heupstream@mediatek.com, leilk.liu@mediatek.com
Subject: Re: [PATCH] dt-bindings: i2c: Add device clock-stretch time via dts
Date: Wed, 24 Mar 2021 11:12:17 -0600	[thread overview]
Message-ID: <20210324171217.GA3262580@robh.at.kernel.org> (raw)
In-Reply-To: <1615622829-15167-1-git-send-email-qii.wang@mediatek.com>

On Sat, Mar 13, 2021 at 04:07:09PM +0800, qii.wang@mediatek.com wrote:
> From: Qii Wang <qii.wang@mediatek.com>
> 
> tSU,STA/tHD,STA/tSU,STOP maybe out of spec due to device
> clock-stretching or circuit loss, we could get device
> clock-stretch time from dts to adjust these parameters
> to meet the spec via EXT_CONF register.
> 
> Signed-off-by: Qii Wang <qii.wang@mediatek.com>
> ---
>  Documentation/devicetree/bindings/i2c/i2c-mt65xx.txt | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/Documentation/devicetree/bindings/i2c/i2c-mt65xx.txt b/Documentation/devicetree/bindings/i2c/i2c-mt65xx.txt
> index 7f0194f..97f66f0 100644
> --- a/Documentation/devicetree/bindings/i2c/i2c-mt65xx.txt
> +++ b/Documentation/devicetree/bindings/i2c/i2c-mt65xx.txt
> @@ -32,6 +32,7 @@ Optional properties:
>    - mediatek,have-pmic: platform can control i2c form special pmic side.
>      Only mt6589 and mt8135 support this feature.
>    - mediatek,use-push-pull: IO config use push-pull mode.
> +  - clock-stretch-ns: Slave device clock-stretch time.

Should be a common I2C property?

>  
>  Example:
>  
> -- 
> 1.9.1
> 

_______________________________________________
Linux-mediatek mailing list
Linux-mediatek@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-mediatek

WARNING: multiple messages have this Message-ID (diff)
From: Rob Herring <robh@kernel.org>
To: qii.wang@mediatek.com
Cc: matthias.bgg@gmail.com, wsa@the-dreams.de,
	devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org,
	srv_heupstream@mediatek.com, leilk.liu@mediatek.com
Subject: Re: [PATCH] dt-bindings: i2c: Add device clock-stretch time via dts
Date: Wed, 24 Mar 2021 11:12:17 -0600	[thread overview]
Message-ID: <20210324171217.GA3262580@robh.at.kernel.org> (raw)
In-Reply-To: <1615622829-15167-1-git-send-email-qii.wang@mediatek.com>

On Sat, Mar 13, 2021 at 04:07:09PM +0800, qii.wang@mediatek.com wrote:
> From: Qii Wang <qii.wang@mediatek.com>
> 
> tSU,STA/tHD,STA/tSU,STOP maybe out of spec due to device
> clock-stretching or circuit loss, we could get device
> clock-stretch time from dts to adjust these parameters
> to meet the spec via EXT_CONF register.
> 
> Signed-off-by: Qii Wang <qii.wang@mediatek.com>
> ---
>  Documentation/devicetree/bindings/i2c/i2c-mt65xx.txt | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/Documentation/devicetree/bindings/i2c/i2c-mt65xx.txt b/Documentation/devicetree/bindings/i2c/i2c-mt65xx.txt
> index 7f0194f..97f66f0 100644
> --- a/Documentation/devicetree/bindings/i2c/i2c-mt65xx.txt
> +++ b/Documentation/devicetree/bindings/i2c/i2c-mt65xx.txt
> @@ -32,6 +32,7 @@ Optional properties:
>    - mediatek,have-pmic: platform can control i2c form special pmic side.
>      Only mt6589 and mt8135 support this feature.
>    - mediatek,use-push-pull: IO config use push-pull mode.
> +  - clock-stretch-ns: Slave device clock-stretch time.

Should be a common I2C property?

>  
>  Example:
>  
> -- 
> 1.9.1
> 

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  reply	other threads:[~2021-03-24 17:12 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-13  8:07 [PATCH] dt-bindings: i2c: Add device clock-stretch time via dts qii.wang
2021-03-13  8:07 ` qii.wang
2021-03-13  8:07 ` qii.wang
2021-03-24 17:12 ` Rob Herring [this message]
2021-03-24 17:12   ` Rob Herring
2021-03-24 17:12   ` Rob Herring
2021-03-26  1:30   ` Qii Wang
2021-03-26  1:30     ` Qii Wang
2021-03-26  1:30     ` Qii Wang

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