From patchwork Wed May 6 21:41:00 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Serge Semin X-Patchwork-Id: 11531925 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 336CF139A for ; Wed, 6 May 2020 21:41:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 209222078C for ; Wed, 6 May 2020 21:41:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730038AbgEFVlY (ORCPT ); Wed, 6 May 2020 17:41:24 -0400 Received: from mail.baikalelectronics.com ([87.245.175.226]:33802 "EHLO mail.baikalelectronics.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728621AbgEFVlY (ORCPT ); Wed, 6 May 2020 17:41:24 -0400 Received: from localhost (unknown [127.0.0.1]) by mail.baikalelectronics.ru (Postfix) with ESMTP id 8867D803087B; Wed, 6 May 2020 21:41:19 +0000 (UTC) X-Virus-Scanned: amavisd-new at baikalelectronics.ru Received: from mail.baikalelectronics.ru ([127.0.0.1]) by localhost (mail.baikalelectronics.ru [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id hYhsMsirV777; Thu, 7 May 2020 00:41:18 +0300 (MSK) From: Serge Semin To: Thomas Bogendoerfer CC: Serge Semin , Serge Semin , Alexey Malahov , Maxim Kaurkin , Pavel Parkhomenko , Ramil Zaripov , Ekaterina Skachko , Vadim Vlasov , Alexey Kolotnikov , Paul Burton , Ralf Baechle , Daniel Lezcano , Thomas Gleixner , Arnd Bergmann , Alessandro Zummo , Alexandre Belloni , Rob Herring , , , , Subject: [PATCH v3 0/7] clocksource: Fix MIPS GIC and DW APB Timer for Baikal-T1 SoC support Date: Thu, 7 May 2020 00:41:00 +0300 Message-ID: <20200506214107.25956-1-Sergey.Semin@baikalelectronics.ru> In-Reply-To: <20200324174325.14213-1-Sergey.Semin@baikalelectronics.ru> References: <20200324174325.14213-1-Sergey.Semin@baikalelectronics.ru> MIME-Version: 1.0 X-ClientProxiedBy: MAIL.baikal.int (192.168.51.25) To mail (192.168.51.25) Sender: linux-mips-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org From: Serge Semin As for all Baikal-T1 SoC related patchsets, which need this, we replaced the DW APB Timer legacy plain text-based dt-binding file with DT schema. Similarly the MIPS GIC bindings file is also converted to DT schema seeing it also defines the MIPS GIC Timer binding. Aside from MIPS-specific r4k timer Baikal-T1 chip also provides a functionality of two another timers: embedded into the MIPS GIC timer and three external DW timers available over APB bus. But we can't use them before the corresponding drivers are properly fixed. First of all DW APB Timer shouldn't be bound to a single CPU, since as being accessible over APB they are external with respect to all possible CPUs. Secondly there might be more than just two DW APB Timers in the system (Baikal-T1 has three of them), so permit the driver to use one of them as a clocksource and the rest - for clockevents. Thirdly it's possible to use MIPS GIC timer as a clocksource so register it in the corresponding subsystem (the patch has been found in the Paul Burton MIPS repo so I left the original Signed-off-by attribute). Finally in the same way as r4k timer the MIPS GIC timer should be used with care when CPUFREQ config is enabled since in case of CM2 the timer counting depends on the CPU reference clock frequency while the clocksource subsystem currently doesn't support the timers with non-stable clock. This patchset is rebased and tested on the mainline Linux kernel 5.7-rc4: 0e698dfa2822 ("Linux 5.7-rc4") tag: v5.7-rc4 Changelog v2: - Fix the SoB tags. - Our corporate email server doesn't change Message-Id anymore, so the patchset is resubmitted being in the cover-letter-threaded format. - Convert the "snps,dw-apb-timer" binding to DT schema in a dedicated patch. - Convert the "mti,gic" binding to DT schema in a dedicated patch. Changelog v3: - Make the MIPS GIC timer sub-node name not having a unit-address number. - Discard allOf: [ $ref: /schemas/interrupt-controller.yaml# ] from MIPS GIC bindings. - Add patch moving the "snps,dw-apb-timer" binding file to the directory with timers binding files. Signed-off-by: Serge Semin Cc: Alexey Malahov Cc: Maxim Kaurkin Cc: Pavel Parkhomenko Cc: Ramil Zaripov Cc: Ekaterina Skachko Cc: Vadim Vlasov Cc: Alexey Kolotnikov Cc: Paul Burton Cc: Ralf Baechle Cc: Daniel Lezcano Cc: Thomas Gleixner Cc: Arnd Bergmann Cc: Alessandro Zummo Cc: Alexandre Belloni Cc: Rob Herring Cc: linux-mips@vger.kernel.org Cc: linux-rtc@vger.kernel.org Cc: devicetree@vger.kernel.org Cc: linux-kernel@vger.kernel.org Paul Burton (1): clocksource: mips-gic-timer: Register as sched_clock Serge Semin (6): dt-bindings: rtc: Convert snps,dw-apb-timer to DT schema dt-bindings: timer: Move snps,dw-apb-timer DT schema from rtc dt-bindings: interrupt-controller: Convert mti,gic to DT schema clocksource: dw_apb_timer: Set clockevent any-possible-CPU mask clocksource: dw_apb_timer_of: Fix missing clockevent timers clocksource: mips-gic-timer: Set limitations on clocksource/sched-clocks usage .../interrupt-controller/mips-gic.txt | 67 -------- .../interrupt-controller/mti,gic.yaml | 148 ++++++++++++++++++ .../devicetree/bindings/rtc/dw-apb.txt | 32 ---- .../bindings/timer/snps,dw-apb-timer.yaml | 88 +++++++++++ drivers/clocksource/dw_apb_timer.c | 18 +-- drivers/clocksource/dw_apb_timer_of.c | 9 +- drivers/clocksource/mips-gic-timer.c | 30 +++- include/linux/dw_apb_timer.h | 2 +- 8 files changed, 272 insertions(+), 122 deletions(-) delete mode 100644 Documentation/devicetree/bindings/interrupt-controller/mips-gic.txt create mode 100644 Documentation/devicetree/bindings/interrupt-controller/mti,gic.yaml delete mode 100644 Documentation/devicetree/bindings/rtc/dw-apb.txt create mode 100644 Documentation/devicetree/bindings/timer/snps,dw-apb-timer.yaml