From: Krzysztof Kozlowski <krzk@kernel.org>
To: ckeitz@amazon.com, Loic Poulain <loic.poulain@oss.qualcomm.com>,
Robert Foss <rfoss@kernel.org>,
Andi Shyti <andi.shyti@kernel.org>, Rob Herring <robh@kernel.org>,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
Conor Dooley <conor+dt@kernel.org>
Cc: linux-arm-msm@vger.kernel.org, linux-i2c@vger.kernel.org,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: i2c: qcom-cci: Document qcom,scl-stretch-enable property
Date: Thu, 5 Mar 2026 16:18:11 +0100 [thread overview]
Message-ID: <7b8585de-38ce-4d87-aa12-4a2cc420402e@kernel.org> (raw)
In-Reply-To: <20260305-cci-scl-stretch-v1-1-8412abc65745@amazon.com>
On 05/03/2026 15:40, Cory Keitz via B4 Relay wrote:
> From: Cory Keitz <ckeitz@amazon.com>
>
> Add the optional boolean property "qcom,scl-stretch-enable" to the
> CCI i2c-bus sub-nodes. This property enables SCL clock stretching on
> the corresponding CCI master, which is needed by peripherals such as
> GMSL deserializers that hold SCL low to absorb forwarding latency.
>
> Signed-off-by: Cory Keitz <ckeitz@amazon.com>
> ---
> Documentation/devicetree/bindings/i2c/qcom,i2c-cci.yaml | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/i2c/qcom,i2c-cci.yaml b/Documentation/devicetree/bindings/i2c/qcom,i2c-cci.yaml
> index 399a09409e07..fea609fa2f05 100644
> --- a/Documentation/devicetree/bindings/i2c/qcom,i2c-cci.yaml
> +++ b/Documentation/devicetree/bindings/i2c/qcom,i2c-cci.yaml
> @@ -78,6 +78,14 @@ patternProperties:
> clock-frequency:
> default: 100000
>
> + qcom,scl-stretch-enable:
I don't understand why only Qualcomm needs per-controller property and
no others need to static configuration. Maybe this is just already solved?
And I actually found this:
https://lore.kernel.org/all/20230312131933.248715-2-andi.shyti@kernel.org/
so this is all done.
Best regards,
Krzysztof
next prev parent reply other threads:[~2026-03-05 15:18 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-05 14:40 [PATCH 0/2] i2c: qcom-cci: Add DT property for SCL clock stretching Cory Keitz via B4 Relay
2026-03-05 14:40 ` [PATCH 1/2] dt-bindings: i2c: qcom-cci: Document qcom,scl-stretch-enable property Cory Keitz via B4 Relay
2026-03-05 15:18 ` Krzysztof Kozlowski [this message]
2026-03-05 23:04 ` Cory Keitz
2026-03-05 14:40 ` [PATCH 2/2] i2c: qcom-cci: Add DT property for SCL clock stretching Cory Keitz via B4 Relay
2026-03-05 15:16 ` [PATCH 0/2] " Loic Poulain
2026-03-05 23:01 ` Cory Keitz
2026-03-11 13:18 ` Konrad Dybcio
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