Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Message-ID: <3b733848-2745-e6ef-f517-039712bbe7af@linaro.org>
Date:   Wed, 12 Jul 2023 22:39:55 +0200
MIME-Version: 1.0
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101
 Thunderbird/102.13.0
Subject: Re: [PATCH 01/53] dt-bindings: interconnect: qcom,icc: Introduce
 fixed BCM voter indices
Content-Language: en-US
To:     Konrad Dybcio <konrad.dybcio@linaro.org>,
        Andy Gross <agross@kernel.org>,
        Bjorn Andersson <andersson@kernel.org>,
        Georgi Djakov <djakov@kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Conor Dooley <conor+dt@kernel.org>,
        cros-qcom-dts-watchers@chromium.org
Cc:     Marijn Suijten <marijn.suijten@somainline.org>,
        linux-arm-msm@vger.kernel.org, linux-pm@vger.kernel.org,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
References: <20230708-topic-rpmh_icc_rsc-v1-0-b223bd2ac8dd@linaro.org>
 <20230708-topic-rpmh_icc_rsc-v1-1-b223bd2ac8dd@linaro.org>
From:   Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
In-Reply-To: <20230708-topic-rpmh_icc_rsc-v1-1-b223bd2ac8dd@linaro.org>
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit
Precedence: bulk

On 11/07/2023 14:18, Konrad Dybcio wrote:
> It makes zero (or less) sense to consume BCM voters per interconnect
> provider. They are shared throughout the entire system and it's enough
> to keep a single reference to each of them.
> 
> Storing them in a shared array at fixed indices will let us improve both
> the representation of the RPMh architecture (every RSC can hold a resource
> vote on any bus, they're not limited in that regard) and save as much as
> kilobytes worth of RAM.
> 
> Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
> ---
>  include/dt-bindings/interconnect/qcom,icc.h | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/include/dt-bindings/interconnect/qcom,icc.h b/include/dt-bindings/interconnect/qcom,icc.h
> index cd34f36daaaa..9c13ef8a044e 100644
> --- a/include/dt-bindings/interconnect/qcom,icc.h
> +++ b/include/dt-bindings/interconnect/qcom,icc.h
> @@ -23,4 +23,12 @@
>  #define QCOM_ICC_TAG_ALWAYS		(QCOM_ICC_TAG_AMC | QCOM_ICC_TAG_WAKE |\
>  					 QCOM_ICC_TAG_SLEEP)
>  
> +#define ICC_BCM_VOTER_APPS		0
> +#define ICC_BCM_VOTER_DISP		1
> +#define ICC_BCM_VOTER_CAM0		2
> +#define ICC_BCM_VOTER_CAM1		3
> +#define ICC_BCM_VOTER_CAM2		4
> +
> +#define ICC_BCM_VOTER_MAX		64

I proposed to skip the max. If you actually use it, you won't be able to
change it ever.


Best regards,
Krzysztof