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Mon, 24 Aug 2026 07:58:23 -0700 (PDT) X-Received: by 2002:a05:622a:34e:b0:52b:4ec6:52c1 with SMTP id d75a77b69052e-52df59fbd50mr211833791cf.3.1787583502825; Mon, 24 Aug 2026 07:58:22 -0700 (PDT) Received: from [192.168.120.193] ([178.235.128.140]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-c249629a901sm1453437466b.25.2026.08.24.07.58.19 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 24 Aug 2026 07:58:21 -0700 (PDT) Message-ID: <5d2504be-0691-4174-9d98-7759205718cd@oss.qualcomm.com> Date: Mon, 24 Aug 2026 16:58:18 +0200 Precedence: bulk X-Mailing-List: linux-serial@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 3/7] soc: qcom: geni-se: Add helper to set SE clock rate via OPP To: Praveen Talari , Sudeep Holla , Cristian Marussi , Ulf Hansson , Bjorn Andersson , Konrad Dybcio , Greg Kroah-Hartman , Jiri Slaby , Mark Brown , Viken Dadhaniya , Andi Shyti Cc: mukesh.savaliya@oss.qualcomm.com, chandana.chiluveru@oss.qualcomm.com, arm-scmi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-serial@vger.kernel.org, linux-spi@vger.kernel.org, linux-i2c@vger.kernel.org References: <20260805-derive_clk_perf_tbl_from_perf_domain_opp_table-v1-0-61171ab1cdce@oss.qualcomm.com> <20260805-derive_clk_perf_tbl_from_perf_domain_opp_table-v1-3-61171ab1cdce@oss.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20260805-derive_clk_perf_tbl_from_perf_domain_opp_table-v1-3-61171ab1cdce@oss.qualcomm.com> Content-Type: text/plain; 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However, the device that owns the OPP table > differs depending on how the SE resources are managed. For Linux clock > managed platforms, the OPP table is associated with the SE device, > whereas on firmware-managed platforms it is associated with the > performance power-domain device. This requires protocol drivers to be > aware of the underlying resource management model when requesting > frequency changes. [...] > +/** > + * geni_se_set_rate() - Set the SE source clock rate via the OPP framework. > + * @se: Pointer to the struct geni_se instance. > + * @freq: The source clock frequency to set. > + * > + * Applies the given frequency through dev_pm_opp_set_rate(), targeting the > + * perf domain device when the SE has power domains attached (firmware > + * managed path), or se->dev otherwise (Linux clock managed path). > + * > + * Return: 0 on success, or a negative error code on failure. > + */ > +int geni_se_set_rate(struct geni_se *se, unsigned long freq) > +{ > + struct device *perf_dev = se->dev; > + > + if (se->pd_list && se->pd_list->pd_devs[DOMAIN_IDX_PERF]) The latter will always be true if the former is Konrad > + perf_dev = se->pd_list->pd_devs[DOMAIN_IDX_PERF]; > + > + return se->has_opp ? dev_pm_opp_set_rate(perf_dev, freq) : 0;