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Wed, 8 Jun 2022 11:00:38 +0900 (KST) Received: from epsmtrp1.samsung.com (unknown [182.195.40.13]) by epcas1p2.samsung.com (KnoxPortal) with ESMTPA id 20220608020038epcas1p29d690189e5f4ec195a410e721da9c959~2greoE3K_3197331973epcas1p2D; Wed, 8 Jun 2022 02:00:38 +0000 (GMT) Received: from epsmgms1p1new.samsung.com (unknown [182.195.42.41]) by epsmtrp1.samsung.com (KnoxPortal) with ESMTP id 20220608020038epsmtrp1c4e2d10c9664c0259ec2f933dc5552ee~2grenPE1-1419514195epsmtrp1o; Wed, 8 Jun 2022 02:00:38 +0000 (GMT) X-AuditID: b6c32a39-f37ff700000026cf-a0-62a002c6a183 Received: from epsmtip1.samsung.com ( [182.195.34.30]) by epsmgms1p1new.samsung.com (Symantec Messaging Gateway) with SMTP id AD.F5.11276.6C200A26; Wed, 8 Jun 2022 11:00:38 +0900 (KST) Received: from [10.113.221.102] (unknown [10.113.221.102]) by epsmtip1.samsung.com (KnoxPortal) with ESMTPA id 20220608020037epsmtip185ff608915ef81f4d9c3c6281c3cc037~2greO7RWm2414924149epsmtip1x; Wed, 8 Jun 2022 02:00:37 +0000 (GMT) Subject: Re: [PATCH v7 0/2] Introduce MediaTek CCI devfreq driver To: Johnson Wang , krzk+dt@kernel.org, robh+dt@kernel.org, kyungmin.park@samsung.com Cc: khilman@kernel.org, djakov@kernel.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, jia-wei.chang@mediatek.com, Project_Global_Chrome_Upstream_Group@mediatek.com From: Chanwoo Choi Organization: Samsung Electronics Message-ID: <1f3bb9cd-dd13-c9fb-9d90-a02159a59463@samsung.com> Date: Wed, 8 Jun 2022 11:00:37 +0900 User-Agent: Mozilla/5.0 (X11; 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charset="utf-8" X-Sendblock-Type: SVC_REQ_APPROVE CMS-TYPE: 101P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20220607140711epcas1p1aca32de28831fae8a6fd3b890b26f7ac References: <20220607140556.6278-1-johnson.wang@mediatek.com> Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org On 6/7/22 11:05 PM, Johnson Wang wrote: > The Cache Coherent Interconnect (CCI) is the management of cache > coherency by hardware. CCI DEVFREQ is DVFS driver for power saving by > scaling clock frequency and supply voltage of CCI. CCI uses the same > input clock source and power rail as LITTLE CPUs on Mediatek SoCs. > > This series depends on: > Chanwoo's repo: kernel/git/chanwoo/linux.git > branch: devfreq-testing > [1]: PM / devfreq: Export devfreq_get_freq_range symbol within devfreq > [2]: PM / devfreq: Add cpu based scaling support to passive governor > [3]: PM / devfreq: passive: Reduce duplicate code when passive_devfreq case > [4]: PM / devfreq: passive: Update frequency when start governor > > Changes in v7: > - remove the 'ret' printing from dev_err_probe(). > > Changes in v6: > - Remove unnecessary "goto" statement. > > Changes in v5: > - Modify some binding description. > - Remove pre_voltage member. > - Not to enable/disable intermediate clock. > - Not to "put" resources that using devm_ variants. > > Resend v4: > - CC interconnect maintainer. > - Change sign-off sequence in commit message. > > Changes in v4: > - Add a maintainer in the binding document. > - Modify clock description. > - Add binding document into MAINTAINERS. > - Replace format specifier %d with %ld. > > Changes in v3: > - Move binding document to 'interconnect' and rename it. > - Add COMPILE_TEST dependence symbol. > - Remove need_voltage_tracking variable. > - Move mtk_ccifreq_voltage_tracking() code into mtk_ccifreq_set_voltage(). > - Add an interation limit in the while() loop. > - Replace 'cci_dev' with 'dev' > - Replace old_* with pre_* > - Remove of_match_ptr() > - Use module_platform_driver() > > Changes in v2: > - Take MT8183 as example in binding document. > - Use dev_err() instead of pr_err(). > - Use 'goto' statement to handle error case. > - Clean up driver code. > > Johnson Wang (2): > dt-bindings: interconnect: Add MediaTek CCI dt-bindings > PM / devfreq: mediatek: Introduce MediaTek CCI devfreq driver > > .../bindings/interconnect/mediatek,cci.yaml | 140 ++++++ > MAINTAINERS | 1 + > drivers/devfreq/Kconfig | 10 + > drivers/devfreq/Makefile | 1 + > drivers/devfreq/mtk-cci-devfreq.c | 474 ++++++++++++++++++ > 5 files changed, 626 insertions(+) > create mode 100644 Documentation/devicetree/bindings/interconnect/mediatek,cci.yaml > create mode 100644 drivers/devfreq/mtk-cci-devfreq.c > Applied them. Thanks. -- Best Regards, Chanwoo Choi Samsung Electronics