From patchwork Mon Apr 25 12:55:44 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Johnson Wang X-Patchwork-Id: 12825750 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 57C0AC433EF for ; Mon, 25 Apr 2022 12:57:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237656AbiDYNAG (ORCPT ); Mon, 25 Apr 2022 09:00:06 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60830 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235833AbiDYM72 (ORCPT ); Mon, 25 Apr 2022 08:59:28 -0400 Received: from mailgw02.mediatek.com (unknown [210.61.82.184]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B8F9C1409E; Mon, 25 Apr 2022 05:55:56 -0700 (PDT) X-UUID: 61afe927d777481899c1cc36f86b09c2-20220425 X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.4,REQID:effaf1d9-7688-43a2-91b5-191fa1153c8c,OB:0,LO B:0,IP:0,URL:0,TC:0,Content:-20,EDM:0,RT:0,SF:0,FILE:0,RULE:Release_Ham,AC TION:release,TS:-20 X-CID-META: VersionHash:faefae9,CLOUDID:403409f0-06b0-4305-bfbf-554bfc9d151a,C OID:IGNORED,Recheck:0,SF:nil,TC:nil,Content:0,EDM:-3,File:nil,QS:0,BEC:nil X-UUID: 61afe927d777481899c1cc36f86b09c2-20220425 Received: from mtkexhb02.mediatek.inc [(172.21.101.103)] by mailgw02.mediatek.com (envelope-from ) (Generic MTA with TLSv1.2 ECDHE-RSA-AES256-SHA384 256/256) with ESMTP id 1770244614; Mon, 25 Apr 2022 20:55:51 +0800 Received: from mtkcas11.mediatek.inc (172.21.101.40) by mtkmbs07n2.mediatek.inc (172.21.101.141) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Mon, 25 Apr 2022 20:55:49 +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; Mon, 25 Apr 2022 20:55:49 +0800 From: Johnson Wang To: , , , CC: , , , , , , , , Johnson Wang Subject: [PATCH v3 0/2] Introduce MediaTek CCI devfreq driver Date: Mon, 25 Apr 2022 20:55:44 +0800 Message-ID: <20220425125546.4129-1-johnson.wang@mediatek.com> X-Mailer: git-send-email 2.18.0 MIME-Version: 1.0 X-MTK: N Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.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 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: devfreq: mediatek: Add mtk cci devfreq dt-bindings PM / devfreq: mediatek: Introduce MediaTek CCI devfreq driver .../devicetree/bindings/devfreq/mtk-cci.yaml | 72 +++ drivers/devfreq/Kconfig | 10 + drivers/devfreq/Makefile | 1 + drivers/devfreq/mtk-cci-devfreq.c | 479 ++++++++++++++++++ 4 files changed, 562 insertions(+) create mode 100644 Documentation/devicetree/bindings/devfreq/mtk-cci.yaml create mode 100644 drivers/devfreq/mtk-cci-devfreq.c