From patchwork Tue Nov 30 19:53:55 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Biju Das X-Patchwork-Id: 518845 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 BE160C433FE for ; Tue, 30 Nov 2021 19:54:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1343534AbhK3T5X (ORCPT ); Tue, 30 Nov 2021 14:57:23 -0500 Received: from relmlor2.renesas.com ([210.160.252.172]:46541 "EHLO relmlie6.idc.renesas.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1343530AbhK3T5X (ORCPT ); Tue, 30 Nov 2021 14:57:23 -0500 X-IronPort-AV: E=Sophos;i="5.87,276,1631545200"; d="scan'208";a="102320739" Received: from unknown (HELO relmlir5.idc.renesas.com) ([10.200.68.151]) by relmlie6.idc.renesas.com with ESMTP; 01 Dec 2021 04:54:02 +0900 Received: from localhost.localdomain (unknown [10.226.93.28]) by relmlir5.idc.renesas.com (Postfix) with ESMTP id C39C640065DB; Wed, 1 Dec 2021 04:53:59 +0900 (JST) From: Biju Das To: Wim Van Sebroeck , Guenter Roeck , Rob Herring Cc: Biju Das , Wolfram Sang , Geert Uytterhoeven , linux-watchdog@vger.kernel.org, devicetree@vger.kernel.org, Chris Paterson , Biju Das , Prabhakar Mahadev Lad , linux-renesas-soc@vger.kernel.org Subject: [PATCH v5 0/2] Add WDT driver for RZ/G2L Date: Tue, 30 Nov 2021 19:53:55 +0000 Message-Id: <20211130195357.18626-1-biju.das.jz@bp.renesas.com> X-Mailer: git-send-email 2.17.1 Precedence: bulk List-ID: X-Mailing-List: linux-watchdog@vger.kernel.org This patch series aims to add WDT driver support for RZ/G2L SoC's. WDT has 3 channels 1) CH0 to check the operation of Cortex-A55-CPU Core0 2) CH1 to check the operation of Cortex-A55-CPU Core1 3) CH2 to check the operation of Cortex-M33 CPU WDT IP supports 1) Normal Watchdog Timer Function 2) Reset Request Function due to CPU Parity Error Once the software activates the watchdog timer, the watchdog timer does not stop until it is reset. Current driver supports Normal Watchdog Timer basic functionality. Tested WDT driver with selftests tool and reboot command All 3 channels tested with below command. cat /dev/watchdog & for i in {1..60}; do sleep 1; echo $i; devmem2 0x12800808; done cat /dev/watchdog1 & for i in {1..60}; do sleep 1; echo $i; devmem2 0x12800c08; done cat /dev/watchdog2 & for i in {1..60}; do sleep 1; echo $i; devmem2 0x12800408; done v4->v5: * Started using the macros MICRO and USEC_PER_SEC * Renamed rzg2l_wdt_get_cycle_msec() to rzg2l_wdt_get_cycle_usec() * Fixed the value of priv->wdev.max_timeout in seconds. V3->V4: * Fixed the build issue reported by kernel test robot V2->V3: * Added Rb tag from Guenter Roeck * Removed Removed patch#1, as the clock changes related to WDT reset selection will be handled in TF-A. V1->V2: * started using clk_get/put instead of devm_clk_get/put * Moved devm_add_action_or_reset after set_drvdata() and * removed redundant action on devm_add_action_or_reset() failure. RFC->V1 * Removed patch#3, the clk patch is queued for 5.17 * Added clock-names and interrupt-names as required properties for RZ/G2L * Re-order clocknames with internal module clock first * Removed pclk_rate from priv. * rzg2l_wdt_write() returns void and Removed tiemout related to register update * rzg2l_wdt_init_timeout() returns void and removed delays. * removed set_bit(WDOG_HW_RUNNING,..) as we can stop watchdog * renamed reset_assert_clock_disable->reset_assert_pm_disable_put * started using devm_reset_control_get_exclusive() * removed platform_set_drvdata(pdev, priv) as there is no user * removed watchdog_set_restart_priority(&priv->wdev, 0) as 0 is the default. * removed remove callback as it is empty. Biju Das (2): dt-bindings: watchdog: renesas,wdt: Add support for RZ/G2L watchdog: Add Watchdog Timer driver for RZ/G2L .../bindings/watchdog/renesas,wdt.yaml | 75 +++-- drivers/watchdog/Kconfig | 8 + drivers/watchdog/Makefile | 1 + drivers/watchdog/rzg2l_wdt.c | 263 ++++++++++++++++++ 4 files changed, 329 insertions(+), 18 deletions(-) create mode 100644 drivers/watchdog/rzg2l_wdt.c