From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.16]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C52AB5EE64; Sat, 3 Feb 2024 15:05:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.16 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706972757; cv=none; b=N+edxHYjAdnWId5t9aMTOkDyEsPkEntXx9twbE5Cispou2FZ4yScrfijBjhFHIUH7NhLJCpK0U8RTDGK8+ztOH+EjsDFE/aTOtq7N5fvhBAHAC0/E2F2j2NNwlwZt009wHCdKYQ3BgG/7daMjvRAIZBJJVMFDByhXKw2WTAIfU4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706972757; c=relaxed/simple; bh=ELEZEWWk9NQcZeuQTjNOf8Xawd967PBWJKiK7K14SIs=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=i8wrQeAJQKyhumsfjmfrmKzs0TdB61NZZdzPDKoJHHdMK5BV6pHCjefFPtW2ySy0E3vNWO6pX4eAFD9K8vIvdQtm+/+N0bre2Feb7Th9miO/Vvz3XJRk7FYRLicts89gUMwcbFQ7Fl2gdoYtV158gPhVh6V9PBi+Fa+1wuYJhDM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=Yjg+4kYz; arc=none smtp.client-ip=192.198.163.16 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="Yjg+4kYz" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1706972756; x=1738508756; h=date:from:to:cc:subject:message-id:references: mime-version:content-transfer-encoding:in-reply-to; bh=ELEZEWWk9NQcZeuQTjNOf8Xawd967PBWJKiK7K14SIs=; b=Yjg+4kYzLsfG50Rw8QHWAZ/+qtKuOQdyrYDzb9hgERXpaud3OCJk/ijl 7IjI5BVb90e41xIUI1zpF1R23atfv0Fx4OMRmObArVNVyu7EduqW+5WD6 smrYrn6McwoUXV14/zN2xKpxcz/iMyzLcJK56ji9HhW26hoskb7JaoBZf 5UtRdTOVE78sFpimli9gfrfZhXWWLqPf3hlqKJMr8114+bxohv0TkAeIy OG7wuR0HY/vW4OSyILh5nCnGf8EnzDRFJ/N+ou455WuIbVhjuBTFwjfeR fAvFJbAXe+mWRXTbpIwEYykc6DyQQ8u0Rcm2eizEk+yj/NwpaVEhxjfkf Q==; X-IronPort-AV: E=McAfee;i="6600,9927,10973"; a="555422" X-IronPort-AV: E=Sophos;i="6.05,240,1701158400"; d="scan'208";a="555422" Received: from fmviesa002.fm.intel.com ([10.60.135.142]) by fmvoesa110.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Feb 2024 07:05:54 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.05,240,1701158400"; d="scan'208";a="23607836" Received: from lkp-server02.sh.intel.com (HELO 59f4f4cd5935) ([10.239.97.151]) by fmviesa002.fm.intel.com with ESMTP; 03 Feb 2024 07:05:47 -0800 Received: from kbuild by 59f4f4cd5935 with local (Exim 4.96) (envelope-from ) id 1rWHaS-0005DA-0N; Sat, 03 Feb 2024 15:05:44 +0000 Date: Sat, 3 Feb 2024 23:04:47 +0800 From: kernel test robot To: Aleksandr Shubin , linux-kernel@vger.kernel.org Cc: llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev, Aleksandr Shubin , Brandon Cheo Fusi , Uwe =?iso-8859-1?Q?Kleine-K=F6nig?= , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland , Paul Walmsley , Palmer Dabbelt , Albert Ou , Philipp Zabel , Cristian Ciocaltea , John Watts , Marc Kleine-Budde , Maksim Kiselev , linux-pwm@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-sunxi@lists.linux.dev, linux-riscv@lists.infradead.org Subject: Re: [PATCH v8 2/3] pwm: Add Allwinner's D1/T113-S3/R329 SoCs PWM support Message-ID: <202402032222.BiIrD3g4-lkp@intel.com> References: <20240131125920.2879433-3-privatesub2@gmail.com> Precedence: bulk X-Mailing-List: linux-pwm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20240131125920.2879433-3-privatesub2@gmail.com> Hi Aleksandr, kernel test robot noticed the following build warnings: [auto build test WARNING on robh/for-next] [also build test WARNING on sunxi/sunxi/for-next linus/master v6.8-rc2 next-20240202] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Aleksandr-Shubin/dt-bindings-pwm-Add-binding-for-Allwinner-D1-T113-S3-R329-PWM-controller/20240131-210313 base: https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next patch link: https://lore.kernel.org/r/20240131125920.2879433-3-privatesub2%40gmail.com patch subject: [PATCH v8 2/3] pwm: Add Allwinner's D1/T113-S3/R329 SoCs PWM support config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20240203/202402032222.BiIrD3g4-lkp@intel.com/config) compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240203/202402032222.BiIrD3g4-lkp@intel.com/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Closes: https://lore.kernel.org/oe-kbuild-all/202402032222.BiIrD3g4-lkp@intel.com/ All warnings (new ones prefixed by >>): >> drivers/pwm/pwm-sun20i.c:47: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst * SUN20I_PWM_MAGIC is used to quickly compute the values of the clock dividers vim +47 drivers/pwm/pwm-sun20i.c 45 46 /** > 47 * SUN20I_PWM_MAGIC is used to quickly compute the values of the clock dividers 48 * div_m (SUN20I_PWM_CLK_CFG_DIV_M) & prescale_k (SUN20I_PWM_CTL_PRESCAL_K) 49 * without using a loop. These dividers limit the # of cycles in a period 50 * to SUN20I_PWM_PCNTR_SIZE by applying a scaling factor of 51 * 1/(div_m * (prescale_k + 1)) to the clock source. 52 * 53 * SUN20I_PWM_MAGIC is derived by solving for div_m and prescale_k 54 * such that for a given requested period, 55 * 56 * i) div_m is minimized for any prescale_k ≤ SUN20I_PWM_CTL_PRESCAL_K_MAX, 57 * ii) prescale_k is minimized. 58 * 59 * The derivation proceeds as follows, with val = # of cycles for reqested 60 * period: 61 * 62 * for a given value of div_m we want the smallest prescale_k such that 63 * 64 * (val >> div_m) // (prescale_k + 1) ≤ 65536 (SUN20I_PWM_PCNTR_SIZE) 65 * 66 * This is equivalent to: 67 * 68 * (val >> div_m) ≤ 65536 * (prescale_k + 1) + prescale_k 69 * ⟺ (val >> div_m) ≤ 65537 * prescale_k + 65536 70 * ⟺ (val >> div_m) - 65536 ≤ 65537 * prescale_k 71 * ⟺ ((val >> div_m) - 65536) / 65537 ≤ prescale_k 72 * 73 * As prescale_k is integer, this becomes 74 * 75 * ((val >> div_m) - 65536) // 65537 ≤ prescale_k 76 * 77 * And is minimized at 78 * 79 * ((val >> div_m) - 65536) // 65537 80 * 81 * Now we pick the smallest div_m that satifies prescale_k ≤ 255 82 * (i.e SUN20I_PWM_CTL_PRESCAL_K_MAX), 83 * 84 * ((val >> div_m) - 65536) // 65537 ≤ 255 85 * ⟺ (val >> div_m) - 65536 ≤ 255 * 65537 + 65536 86 * ⟺ val >> div_m ≤ 255 * 65537 + 2 * 65536 87 * ⟺ val >> div_m < (255 * 65537 + 2 * 65536 + 1) 88 * ⟺ div_m = fls((val) / (255 * 65537 + 2 * 65536 + 1)) 89 * 90 * Suggested by Uwe Kleine-König 91 */ 92 #define SUN20I_PWM_MAGIC (255 * 65537 + 2 * 65536 + 1) 93 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki From mboxrd@z Thu Jan 1 00:00:00 1970 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 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devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-sunxi@lists.linux.dev, linux-riscv@lists.infradead.org Subject: Re: [PATCH v8 2/3] pwm: Add Allwinner's D1/T113-S3/R329 SoCs PWM support Message-ID: <202402032222.BiIrD3g4-lkp@intel.com> References: <20240131125920.2879433-3-privatesub2@gmail.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20240131125920.2879433-3-privatesub2@gmail.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240203_070555_085153_48171EE0 X-CRM114-Status: GOOD ( 13.83 ) 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: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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