From patchwork Fri Oct 20 11:34:16 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Alvin_=C5=A0ipraga?= X-Patchwork-Id: 13430613 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 C5BA2CDB474 for ; Fri, 20 Oct 2023 11:34:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1377166AbjJTLeg (ORCPT ); Fri, 20 Oct 2023 07:34:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37678 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1377142AbjJTLec (ORCPT ); Fri, 20 Oct 2023 07:34:32 -0400 Received: from mail-ej1-x635.google.com (mail-ej1-x635.google.com [IPv6:2a00:1450:4864:20::635]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B5D7CD5E for ; Fri, 20 Oct 2023 04:34:29 -0700 (PDT) Received: by mail-ej1-x635.google.com with SMTP id a640c23a62f3a-99c3c8adb27so108019866b.1 for ; Fri, 20 Oct 2023 04:34:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=pqrs.dk; s=google; t=1697801668; x=1698406468; darn=vger.kernel.org; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=fXvJpV0gpvSkUrAaGppJnbjeNlJABP+T2f/Ne1XnKTw=; b=QkYBgQhmBFsfyP73EUzOvZDT/GEJnHObufFs6IWBqgMHsWUH0M+iq/NS7ChVHnELi+ rMNjEwbss/U1MdOxoCC3BBAsUj9tHA4cyJF/Ke8jwfCFQy3xRYtPwwKD5l3+svQCzm1v MT5Ku8eM9TQ/ttWUdVeMNrcHK11HFBPm9Hp4l/BVkWk+QRDJbMrRlE0RK5bF8m86owCm 7IvUEbaqsmI+Uzp5JP4ADmGLAN0Pf322LI+E2WtoODzKLyqrUJmMizB7yoCge9xU14qK jX8ldJcjtBPil0rdqXrjHWuoxuJ5JuNMNK+KAgqu2eATCyurVyRShtZ+1FCl3YaliAE4 T4cg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1697801668; x=1698406468; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=fXvJpV0gpvSkUrAaGppJnbjeNlJABP+T2f/Ne1XnKTw=; b=qrY4Ogl/1QMIUzkrurOBluPyaoJTwDj9UTpKsbhx6hYfwbJJFA2Bw3bLDYBiCyuCpn SeOnwu13/fuo+IaOaqIb3xJxJIBwRGYMJ+M/V0la57bzvRnnk2b0848gae4c3o8/PPq1 zWvWV3JhAIW/1pRtc2/yPSYlTS/W6pKYXXInnLLg/Qa6dlsFUBldT8wvXrIBqdevZ6mJ pMXyROq40d8YmQIAcHyaqMva/mxli0NRQUEugddzG6GHxCzqVMFfBOvofOiYWhWGlVej uaAaqSG5AV1iuDzFaH2xK5pVk3QCot2X2FEBxeSmm8Fy/UKNiO3su0ZAVuq+GLIMRDv0 fRGA== X-Gm-Message-State: AOJu0YzXvSU4gYeDRD705geEn5+gNXmYUT+fwKqAB7hS/kSP20Co02T6 cweU7Ek9kedutxmQJnuUmEOGDa2oDRXQJJdCmqbaJg== X-Google-Smtp-Source: AGHT+IE2cqRe/b7SznA5f9wgW3W00fTFZ38FmRaqPeuDiU4EW9+UF4yLZznf7d1onwrlLkBbX3ltTg== X-Received: by 2002:a17:907:86a0:b0:9bd:fc4a:c70b with SMTP id qa32-20020a17090786a000b009bdfc4ac70bmr1310791ejc.70.1697801668164; Fri, 20 Oct 2023 04:34:28 -0700 (PDT) Received: from capella.localdomain ([193.89.194.60]) by smtp.gmail.com with ESMTPSA id ce10-20020a170906b24a00b009b654751c14sm1300320ejb.47.2023.10.20.04.34.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 20 Oct 2023 04:34:27 -0700 (PDT) From: =?utf-8?q?Alvin_=C5=A0ipraga?= Date: Fri, 20 Oct 2023 13:34:16 +0200 Subject: [PATCH v5 3/3] clk: si5351: allow PLLs to be adjusted without reset MIME-Version: 1.0 Message-Id: <20231020-alvin-clk-si5351-no-pll-reset-v5-3-f0c1ba537f88@bang-olufsen.dk> References: <20231020-alvin-clk-si5351-no-pll-reset-v5-0-f0c1ba537f88@bang-olufsen.dk> In-Reply-To: <20231020-alvin-clk-si5351-no-pll-reset-v5-0-f0c1ba537f88@bang-olufsen.dk> To: Michael Turquette , Stephen Boyd , Rob Herring , Krzysztof Kozlowski , Conor Dooley , =?utf-8?q?Alvin_=C5=A0ipraga?= Cc: Sebastian Hesselbarth , Rabeeh Khoury , Jacob Siverskog , Sergej Sawazki , linux-clk@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org X-Mailer: b4 0.12.3 Precedence: bulk List-ID: X-Mailing-List: linux-clk@vger.kernel.org From: Alvin Šipraga Introduce a new PLL reset mode flag which controls whether or not to reset a PLL after adjusting its rate. The mode can be configured through platform data or device tree. Since commit 6dc669a22c77 ("clk: si5351: Add PLL soft reset"), the driver unconditionally resets a PLL whenever its rate is adjusted. The rationale was that a PLL reset was required to get three outputs working at the same time. Before this change, the driver never reset the PLLs. Commit b26ff127c52c ("clk: si5351: Apply PLL soft reset before enabling the outputs") subsequently introduced an option to reset the PLL when enabling a clock output that sourced it. Here, the rationale was that this is required to get a deterministic phase relationship between multiple output clocks. This clearly shows that it is useful to reset the PLLs in applications where multiple clock outputs are used. However, the Si5351 also allows for glitch-free rate adjustment of its PLLs if one avoids resetting the PLL. In our audio application where a single Si5351 clock output is used to supply a runtime adjustable bit clock, this unconditional PLL reset behaviour introduces unwanted glitches in the clock output. It would appear that the problem being solved in the former commit may be solved by using the optional device tree property introduced in the latter commit, obviating the need for an unconditional PLL reset after rate adjustment. But it's not OK to break the default behaviour of the driver, and it cannot be assumed that all device trees are using the property introduced in the latter commit. Hence, the new behaviour is made opt-in. Cc: Sebastian Hesselbarth Cc: Rabeeh Khoury Cc: Jacob Siverskog Cc: Sergej Sawazki Signed-off-by: Alvin Šipraga Acked-by: Sebastian Hesselbarth --- drivers/clk/clk-si5351.c | 47 +++++++++++++++++++++++++++++++++--- include/linux/platform_data/si5351.h | 2 ++ 2 files changed, 46 insertions(+), 3 deletions(-) diff --git a/drivers/clk/clk-si5351.c b/drivers/clk/clk-si5351.c index cbf7cde01157..bed0fe3bfa08 100644 --- a/drivers/clk/clk-si5351.c +++ b/drivers/clk/clk-si5351.c @@ -506,6 +506,8 @@ static int si5351_pll_set_rate(struct clk_hw *hw, unsigned long rate, { struct si5351_hw_data *hwdata = container_of(hw, struct si5351_hw_data, hw); + struct si5351_platform_data *pdata = + hwdata->drvdata->client->dev.platform_data; u8 reg = (hwdata->num == 0) ? SI5351_PLLA_PARAMETERS : SI5351_PLLB_PARAMETERS; @@ -518,9 +520,10 @@ static int si5351_pll_set_rate(struct clk_hw *hw, unsigned long rate, (hwdata->params.p2 == 0) ? SI5351_CLK_INTEGER_MODE : 0); /* Do a pll soft reset on the affected pll */ - si5351_reg_write(hwdata->drvdata, SI5351_PLL_RESET, - hwdata->num == 0 ? SI5351_PLL_RESET_A : - SI5351_PLL_RESET_B); + if (pdata->pll_reset[hwdata->num]) + si5351_reg_write(hwdata->drvdata, SI5351_PLL_RESET, + hwdata->num == 0 ? SI5351_PLL_RESET_A : + SI5351_PLL_RESET_B); dev_dbg(&hwdata->drvdata->client->dev, "%s - %s: p1 = %lu, p2 = %lu, p3 = %lu, parent_rate = %lu, rate = %lu\n", @@ -1222,6 +1225,44 @@ static int si5351_dt_parse(struct i2c_client *client, } } + /* + * Parse PLL reset mode. For compatibility with older device trees, the + * default is to always reset a PLL after setting its rate. + */ + pdata->pll_reset[0] = true; + pdata->pll_reset[1] = true; + + of_property_for_each_u32(np, "silabs,pll-reset-mode", prop, p, num) { + if (num >= 2) { + dev_err(&client->dev, + "invalid pll %d on pll-reset-mode prop\n", num); + return -EINVAL; + } + + p = of_prop_next_u32(prop, p, &val); + if (!p) { + dev_err(&client->dev, + "missing pll-reset-mode for pll %d\n", num); + return -EINVAL; + } + + switch (val) { + case 0: + /* Reset PLL whenever its rate is adjusted */ + pdata->pll_reset[num] = true; + break; + case 1: + /* Don't reset PLL whenever its rate is adjusted */ + pdata->pll_reset[num] = false; + break; + default: + dev_err(&client->dev, + "invalid pll-reset-mode %d for pll %d\n", val, + num); + return -EINVAL; + } + } + /* per clkout properties */ for_each_child_of_node(np, child) { if (of_property_read_u32(child, "reg", &num)) { diff --git a/include/linux/platform_data/si5351.h b/include/linux/platform_data/si5351.h index c71a2dd66143..5f412a615532 100644 --- a/include/linux/platform_data/si5351.h +++ b/include/linux/platform_data/si5351.h @@ -105,10 +105,12 @@ struct si5351_clkout_config { * @clk_xtal: xtal input clock * @clk_clkin: clkin input clock * @pll_src: array of pll source clock setting + * @pll_reset: array indicating if plls should be reset after setting the rate * @clkout: array of clkout configuration */ struct si5351_platform_data { enum si5351_pll_src pll_src[2]; + bool pll_reset[2]; struct si5351_clkout_config clkout[8]; };