From patchwork Tue Jun 4 17:32:18 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolas Saenz Julienne X-Patchwork-Id: 10975831 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id EB26414B6 for ; Tue, 4 Jun 2019 17:33:45 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D5AE5287ED for ; Tue, 4 Jun 2019 17:33:45 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id C7B98287F3; Tue, 4 Jun 2019 17:33:45 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 50819287ED for ; Tue, 4 Jun 2019 17:33:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726305AbfFDRdo (ORCPT ); Tue, 4 Jun 2019 13:33:44 -0400 Received: from mx2.suse.de ([195.135.220.15]:39300 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726092AbfFDRdo (ORCPT ); Tue, 4 Jun 2019 13:33:44 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id F3163AE05; Tue, 4 Jun 2019 17:33:42 +0000 (UTC) From: Nicolas Saenz Julienne To: stefan.wahren@i2se.com, linux-rpi-kernel@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-pm@vger.kernel.org Cc: mbrugger@suse.de, viresh.kumar@linaro.org, rjw@rjwysocki.net, sboyd@kernel.org, eric@anholt.net, f.fainelli@gmail.com, bcm-kernel-feedback-list@broadcom.com, ptesarik@suse.com, ssuloev@orpaltech.com, linux-clk@vger.kernel.org, mturquette@baylibre.com, Nicolas Saenz Julienne , linux-kernel@vger.kernel.org Subject: [PATCH 0/4] cpufreq support for the Raspberry Pi Date: Tue, 4 Jun 2019 19:32:18 +0200 Message-Id: <20190604173223.4229-1-nsaenzjulienne@suse.de> X-Mailer: git-send-email 2.21.0 MIME-Version: 1.0 Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Hi all, this series aims at adding cpufreq support to the Raspberry Pi family of boards. The previous revision can be found at: https://lkml.org/lkml/2019/5/20/431 The series first factors out 'pllb' from clk-bcm2385 and creates a new clk driver that operates it over RPi's firmware interface[1]. We are forced to do so as the firmware 'owns' the pll and we're not allowed to change through the register interface directly as we might race with the over-temperature and under-voltage protections provided by the firmware. Next it creates a minimal cpufreq driver that populates the CPU's opp table, and registers cpufreq-dt. Which is needed as the firmware controls the max and min frequencies available. This was tested on a RPi3b+ and RPI2b which are the boards I have access to. Until this is tested broadly the cpufreq driver takes care of filtering out the rest of boards. That's all, kind regards, Nicolas [1] https://github.com/raspberrypi/firmware/wiki/Mailbox-property-interface --- Changes since RFC: - Addressed Viresh's comments in cpufreq driver - Addressed Stefan's comments in both cpufreq & clk drivers - Moved all firmware clk operations into it's own driver Nicolas Saenz Julienne (4): clk: bcm2835: remove pllb clk: bcm283x: add driver interfacing with Raspberry Pi's firmware clk: bcm2835: register Raspberry Pi's firmware clk device cpufreq: add driver for Raspbery Pi drivers/clk/bcm/Makefile | 1 + drivers/clk/bcm/clk-bcm2835.c | 40 ++-- drivers/clk/bcm/clk-raspberrypi.c | 316 ++++++++++++++++++++++++++ drivers/cpufreq/Kconfig.arm | 8 + drivers/cpufreq/Makefile | 1 + drivers/cpufreq/raspberrypi-cpufreq.c | 84 +++++++ 6 files changed, 423 insertions(+), 27 deletions(-) create mode 100644 drivers/clk/bcm/clk-raspberrypi.c create mode 100644 drivers/cpufreq/raspberrypi-cpufreq.c