From patchwork Fri May 13 03:28:30 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Johnson Wang X-Patchwork-Id: 12848327 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id B5D8CC433EF for ; Fri, 13 May 2022 03:32:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-ID:Date:Subject:CC :To:From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=IbduVemtL0bIcsjyGJnW8GdZqp0554aS15Q4q/sHeF8=; b=kDbThg9Qw5T6w0 0SrPrtoh8UR6YT6b25NvZX4oLi/Z2h7BvtzqwIpYKTXru4A3vNQPXzIsd2ZeDCuJTMS84T8oopmtt 9YFd8xEyuCUUyOnmIy8pc+IhuRFvdbx/NTQS1LRhoSYlWBGjNTws85QLzwb/hPuYIf9FaYp4Tfvl6 j0StGijfPi7IokaNhlVcDHbnrcYIwkgqNNdcRaoWRD/iE2aytAv+gqjXxWKHIOTuqNFS0q1yuryHx reMeUwh4keNOJL6Vh2jil86Ski2bcJLzBndu/vs0dbrG1uk5TSLyRXHSyfaYdDtWYC046dw+x9b5o V9tt4MhiHoexW5bjPDPg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1npM1R-00EK48-Te; Fri, 13 May 2022 03:31:22 +0000 Received: from mailgw02.mediatek.com ([216.200.240.185]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1npM1O-00EK0l-AZ; Fri, 13 May 2022 03:31:19 +0000 X-UUID: c585bd74c785433f87281c2665b37b45-20220512 X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.4, REQID:f3207785-94f5-40ad-aded-183efc726ecf, OB:0, LO B:0,IP:0,URL:0,TC:0,Content:0,EDM:0,RT:0,SF:0,FILE:0,RULE:Release_Ham,ACTI ON:release,TS:0 X-CID-META: VersionHash:faefae9, CLOUDID:3aee0ef2-ab23-4aed-a67b-f96514452486, C OID:IGNORED,Recheck:0,SF:nil,TC:nil,Content:0,EDM:-3,File:nil,QS:0,BEC:nil X-UUID: c585bd74c785433f87281c2665b37b45-20220512 Received: from mtkcas66.mediatek.inc [(172.29.193.44)] by mailgw02.mediatek.com (envelope-from ) (musrelay.mediatek.com ESMTP with TLSv1.2 ECDHE-RSA-AES256-SHA384 256/256) with ESMTP id 299258035; Thu, 12 May 2022 20:31:10 -0700 Received: from mtkmbs11n2.mediatek.inc (172.21.101.187) by MTKMBS62DR.mediatek.inc (172.29.94.18) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Thu, 12 May 2022 20:28:52 -0700 Received: from mtkcas11.mediatek.inc (172.21.101.40) by mtkmbs11n2.mediatek.inc (172.21.101.187) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id 15.2.792.3; Fri, 13 May 2022 11:28:51 +0800 Received: from mtksdccf07.mediatek.inc (172.21.84.99) by mtkcas11.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Fri, 13 May 2022 11:28:50 +0800 From: Johnson Wang To: , , , CC: , , , , , , , , , Johnson Wang Subject: [RESEND v4 0/2] Introduce MediaTek CCI devfreq driver Date: Fri, 13 May 2022 11:28:30 +0800 Message-ID: <20220513032832.17645-1-johnson.wang@mediatek.com> X-Mailer: git-send-email 2.18.0 MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220512_203118_469411_1B0149ED X-CRM114-Status: GOOD ( 12.12 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 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