linux-kernel - Re: [PATCH] media: qcom: camss: Enable setting the rate to camnoc_rt

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Message-ID: <9984bc23-05ef-4d46-aeb8-feb0a18e5762@kernel.org>
Date: Thu, 16 Oct 2025 07:54:21 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Hangxiang Ma <hangxiang.ma@....qualcomm.com>,
 Loic Poulain <loic.poulain@....qualcomm.com>, Robert Foss
 <rfoss@...nel.org>, Andi Shyti <andi.shyti@...nel.org>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Todor Tomov <todor.too@...il.com>,
 Vladimir Zapolskiy <vladimir.zapolskiy@...aro.org>,
 Mauro Carvalho Chehab <mchehab@...nel.org>,
 Bryan O'Donoghue <bryan.odonoghue@...aro.org>
Cc: linux-i2c@...r.kernel.org, linux-arm-msm@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-media@...r.kernel.org
Subject: Re: [PATCH] media: qcom: camss: Enable setting the rate to
 camnoc_rt_axi clock

On 15/10/2025 04:43, Hangxiang Ma wrote:
> On hardware architectures where a single CAMNOC module is split into
> two, one for each of the real time (RT) and non real time (NRT) modules
> within camera sub system, processing VFE output over the AXI bus
> requires enabling and setting the appropriate clock rate for the RT
> CAMNOC. This change lays the groundwork for supporting such
> configurations.
> 
> Signed-off-by: Hangxiang Ma <hangxiang.ma@....qualcomm.com>
> ---
> This change lays the groundwork for supporting configurations for
> hardware architectures that split a single CAMNOC module into real time
> (RT) and non real time (NRT).
> ---
>  drivers/media/platform/qcom/camss/camss-vfe.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/platform/qcom/camss/camss-vfe.c b/drivers/media/platform/qcom/camss/camss-vfe.c
> index ee08dbbddf88..09b29ba383f1 100644
> --- a/drivers/media/platform/qcom/camss/camss-vfe.c
> +++ b/drivers/media/platform/qcom/camss/camss-vfe.c
> @@ -914,7 +914,8 @@ static int vfe_match_clock_names(struct vfe_device *vfe,
>  	return (!strcmp(clock->name, vfe_name) ||
>  		!strcmp(clock->name, vfe_lite_name) ||
>  		!strcmp(clock->name, "vfe_lite") ||
> -		!strcmp(clock->name, "camnoc_axi"));
> +		!strcmp(clock->name, "camnoc_axi") ||
> +		!strcmp(clock->name, "camnoc_rt_axi"));

Just use camnoc_axi for both. Look at your bindings - why do you keep
different names for same signal?

Best regards,
Krzysztof