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 X-Spam-Level: X-Spam-Status: No, score=-3.0 required=3.0 tests=DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED,DKIM_VALID,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C4DC6C468C0 for ; Sat, 8 Jun 2019 18:06:51 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 9761721537 for ; Sat, 8 Jun 2019 18:06:51 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="lYnGXRBL"; dkim=fail reason="signature verification failed" (2048-bit key) header.d=googlemail.com header.i=@googlemail.com header.b="NMBwiOLI" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9761721537 Authentication-Results: mail.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=googlemail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-Id:Date:Subject:To :From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=a05GeElzgKEf2968C1Zy/q9yZfnryg2riABPslurook=; b=lYnGXRBLAOQdJ3 o22dBcNHdoXrsuzqIKyxU69eDaAaXbBpJ2QvV9EZYoHaMVYed+v8W3tM2ZkCdAtpik5+q522zHYai HtA7a+BUCvSDg7w+az5QLkGIIlsr0adLsrYkyNIoCLuWiMOZxXDmFofo7vvbDig+jNz7b+E0jys1Y OBW1jvdvL6mcl55FDn4untCtu4VsQAJJXB5unbGEb/doQ9klmi3/WF1rzJ/JxYhPaNSdnU2QmrGbF QmBFoHK7c9HRI1g7lvFO1Zlle5WpkcgK1wzUbLlIc3t0M79jt4RUwYiErRjysAXPSQjWRn0q7/86T qBRaEfQoLZH+j/xiBqrA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1hZfjl-0000nD-Lx; Sat, 08 Jun 2019 18:06:41 +0000 Received: from mail-wr1-x441.google.com ([2a00:1450:4864:20::441]) by bombadil.infradead.org with esmtps (Exim 4.92 #3 (Red Hat Linux)) id 1hZfjf-0000kA-SE; Sat, 08 Jun 2019 18:06:37 +0000 Received: by mail-wr1-x441.google.com with SMTP id c2so5203125wrm.8; Sat, 08 Jun 2019 11:06:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=googlemail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=CuUE0MVJ4EiDj/R4+UJN1pSKA+Jns9ufEuzEwI3ecfc=; b=NMBwiOLIzdn0IuBMvEJo7m9mr0pup/SZfwc+LTYFylMBWek4k8fb/5oanI2zRZVyVG ++6Ci7cqfziSdlIXVJ1lmsoWd7srcHkQSeidh17/m0biXfhKzc0ZzkzLNvLvKwbGAlt0 pp+Q0rCjF9NGdNpsTMu8Aq3JW9wW20otUvjOozfWEbLVFHJ93N5iBe+iJvc0XSvqXsua cmJUDYo90rhfxOM1kisxWWpywnzVeJfanShGdBuJP5tweH+Wr5xj9Vbholo7DgBQosov oF/iANPXLGa0UGR2SSArlAedGXOI6Z6dZanjTU5xEgCttjydEeHf7NneO3yZRRNetn/z ERBg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=CuUE0MVJ4EiDj/R4+UJN1pSKA+Jns9ufEuzEwI3ecfc=; b=X1DRvgHe83xFdNLrceFNNOQi0y5iK09/dIerZK7xBkiJGszzkYSHBaw6UMdyV+U5Y7 Ls9po/1FLeZoiZuxnNPzfcMxsAtPHBi4/aQoqnxBg/hWMvqIH1Lpi575UReve63CRYaO NEfEYyfaLzakHycfpzV9Bv9Rvtk9pPWl6pClv/IRM5oSc4BDyG8GoWvsNS005m2pQOrM nvm5d5tXjDmu8Yhn+/As+gWgs02g4s/hpi/qgruvizJzL5mJDUzvUiYAiuJpXCnWbjF7 Fi3ucG+x/Q0rlUC9joOt/kd0ncczUa12A4x/0ET9dh4tQIvLFv5nlgUqYzU7jO5OPmPv 0KVw== X-Gm-Message-State: APjAAAWBuqq8z+poV1RVRTOps3P6mYPc1TfJdhQVfkTlxZZd6fArXou8 CIBi5LnawC72ufdK4O8rIxwXhwKX X-Google-Smtp-Source: APXvYqy3O37+yFg/dRFn1re7VJBCjQhw131ukejmKTFgVlkkAI9DNI/H+HB3d7RDWFCQTx4maYTgYg== X-Received: by 2002:adf:ed41:: with SMTP id u1mr22980982wro.162.1560017193772; Sat, 08 Jun 2019 11:06:33 -0700 (PDT) Received: from blackbox.darklights.net (p200300F133DDA400D12EFF43FED1E981.dip0.t-ipconnect.de. [2003:f1:33dd:a400:d12e:ff43:fed1:e981]) by smtp.googlemail.com with ESMTPSA id c7sm5143345wrp.57.2019.06.08.11.06.32 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Sat, 08 Jun 2019 11:06:32 -0700 (PDT) From: Martin Blumenstingl To: linux-amlogic@lists.infradead.org, linux-pwm@vger.kernel.org, thierry.reding@gmail.com Subject: [PATCH v2 00/14] pwm-meson: cleanups and improvements Date: Sat, 8 Jun 2019 20:06:12 +0200 Message-Id: <20190608180626.30589-1-martin.blumenstingl@googlemail.com> X-Mailer: git-send-email 2.21.0 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190608_110635_917694_67C49E3E X-CRM114-Status: GOOD ( 14.17 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Martin Blumenstingl , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, u.kleine-koenig@pengutronix.de Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org This series consists of various cleanups and improvements for the pwm-meson driver. Patches 1 to 6 are small code cleanups with the goal of making the code easier to read. Patches 7 to 9 are reworking the way the per-channel settings are accessed. This is a first preparation step for adding full support to meson_pwm_get_state() in the pwm-meson driver. Patch 7 makes struct meson_pwm_channel accessible from struct meson_pwm because meson_pwm_get_state() cannot use pwm_get_chip_data(). Patch 8 removes redundant switch/case statements and ensures that we don't have to add another redundant one for the upcoming full meson_pwm_get_state() implementation. Patch 9 gets rid of meson_pwm_add_channels() and moves the pwm_set_chip_data() call to meson_pwm_request() (like all other PWM drivers do - except two). Patch 10 is based on a suggestion by Uwe to simplify the calculation of the values which the PWM IP requires. The nice benefit of this is that we have an easier calculation which we can do "in reverse" for the meson_pwm_get_state() (which calculates nanoseconds from the hardware values). Patch 11 implements reading the period and duty cycle in the meson_pwm_get_state() callback. Patch 12 removes some internal caching which we don't need anymore now meson_pwm_get_state() is fully implemented. The PWM core now takes care of not calling pwm_ops.apply() if "nothing has changed". Patch 13 adds support for PWM_POLARITY_INVERSED when disabling the output as suggested by Uwe. Patch 14 completes this series by adding some documentation to the driver. Thanks to Neil for summarizing how the hardware works internally. Due to the changed PWM calculation in patch 10 I have verified that we don't break any existing boards. The patch itself contains two examples which show that the new calculation improves precision. I made screenshots of the measurements in pulseview [0] for the second case ("PWM LED on Khadas VIM"): - old algorithm: [1] - old algorithm: [2] Dependencies: This series applies on top of Neil's patch "pwm: pwm-meson: update with SPDX Licence identifier" [3] Changes since v1 at [4]: - fixed MESON_NUM_PWM vs MESON_NUM_PWMS typo in patch #7 - add another example to patch #10 where the pre_div has changed with the new calculation. the generated PWM signal is still the same as measuring shows - added Neil's Reviewed-by's and Uwe's Acked-by (thank you!) [0] https://sigrok.org/wiki/PulseView [1] https://abload.de/img/old-algormjs9.png [2] https://abload.de/img/new-algo4ckjo.png [3] https://patchwork.kernel.org/patch/10951319/ [4] https://patchwork.kernel.org/cover/10961073/ Martin Blumenstingl (14): pwm: meson: unify the parameter list of meson_pwm_{enable,disable} pwm: meson: use devm_clk_get_optional() to get the input clock pwm: meson: use GENMASK and FIELD_PREP for the lo and hi values pwm: meson: change MISC_CLK_SEL_WIDTH to MISC_CLK_SEL_MASK pwm: meson: don't duplicate the polarity internally pwm: meson: pass struct pwm_device to meson_pwm_calc() pwm: meson: add the meson_pwm_channel data to struct meson_pwm pwm: meson: add the per-channel register offsets and bits in a struct pwm: meson: move pwm_set_chip_data() to meson_pwm_request() pwm: meson: simplify the calculation of the pre-divider and count pwm: meson: read the full hardware state in meson_pwm_get_state() pwm: meson: don't cache struct pwm_state internally pwm: meson: add support PWM_POLARITY_INVERSED when disabling pwm: meson: add documentation to the driver drivers/pwm/pwm-meson.c | 323 +++++++++++++++++++++------------------- 1 file changed, 169 insertions(+), 154 deletions(-) -- 2.21.0 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel