From patchwork Mon Jan 18 04:11:56 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manivannan Sadhasivam X-Patchwork-Id: 365694 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=-18.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, 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 22053C433DB for ; Mon, 18 Jan 2021 04:14:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E83C32222F for ; Mon, 18 Jan 2021 04:14:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732188AbhAREOV (ORCPT ); Sun, 17 Jan 2021 23:14:21 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34874 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732180AbhAREOS (ORCPT ); Sun, 17 Jan 2021 23:14:18 -0500 Received: from mail-pf1-x42a.google.com (mail-pf1-x42a.google.com [IPv6:2607:f8b0:4864:20::42a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A60D2C0617A2 for ; Sun, 17 Jan 2021 20:12:47 -0800 (PST) Received: by mail-pf1-x42a.google.com with SMTP id o20so1031912pfu.0 for ; Sun, 17 Jan 2021 20:12:47 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=RmLbr7qUzl1MTnqQWZhlIJBHXutyuDgrinxDo9CCubY=; b=Lt0obleqpybMZAIrPC2n9Vajsw7PqlBVg+XhnXMAFYHLYcPjZTN5OFNb9SC8DCwvA5 goM5s8urSo83hZYu058rAFKWybuHpHX9plMpPUANQ+G+Fnyn7srjF5dsnQCgyIhRsS/R 7evN9ZWKzvWWfwyUTFj/Xlu+LRCU2bqEF4Q8TEdlkvAy83VdRmvrj5VLVToxDIIgAuEF 52NEbaHspwxTSGzTh6qdJ5Sugp2EVXPHCvFoIcsMzslHTfYuPGnO8vdylTZdvpSCF7tu Rz64RuS0gXM9F+tXH8Nqhz3/4heS2me4spyzEt4D+HKYJirIqloh3T8vg9nfnNaB4H9u I4MQ== 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:in-reply-to :references:mime-version:content-transfer-encoding; bh=RmLbr7qUzl1MTnqQWZhlIJBHXutyuDgrinxDo9CCubY=; b=Y8Gz4Y+B53AnBtjXXKCUYpocLl/IgQcK5eGxm/ymsx9Eg6/y8q2SKuQ1eijjEzW5Hc XxThJOnR1hgYKA1MekvaHxrJaYaKYu+s4Bkc3GEleH5NkPuVWx8HWH5C1bb6nIQSFOgi lGhuSlYF0fwIIyR4o+BuI/iee8vcXnUwUuhl6Iuw8G234Rl7MP1oNRVO9aexjcuByG46 qYhn19aa82ybjGONxior7N/tGV6+2yftXC5eqGfQCRN2vXH5KO/AC2SU6uAI20T8FDRR 2Fmbu5x2Q/esfDTNt9JrBIMOCXTQahb1IAtx/vz0LSIK+TuimV9kySbYU7bUtbWGsnyX Lppw== X-Gm-Message-State: AOAM53131wpztS8EnxkKJyZOQjhGK+VAVXZ9NFhJdwjR7grcx/twtjd1 Xf4qm5JqU9lnphCsUE6SlpXL X-Google-Smtp-Source: ABdhPJyzMz/9WCKbybYtoh/9zmy6Zh47DU0GQKf5yyd/8y2O7AHeo+HZ5GNW/YE0emM3XyD+McFBqw== X-Received: by 2002:a63:e246:: with SMTP id y6mr24036307pgj.412.1610943167148; Sun, 17 Jan 2021 20:12:47 -0800 (PST) Received: from localhost.localdomain ([103.77.37.182]) by smtp.gmail.com with ESMTPSA id h15sm6727319pja.4.2021.01.17.20.12.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 17 Jan 2021 20:12:46 -0800 (PST) From: Manivannan Sadhasivam To: mturquette@baylibre.com, sboyd@kernel.org, robh+dt@kernel.org, jassisinghbrar@gmail.com Cc: viresh.kumar@linaro.org, ulf.hansson@linaro.org, bjorn.andersson@linaro.org, agross@kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-clk@vger.kernel.org, devicetree@vger.kernel.org, Manivannan Sadhasivam Subject: [PATCH v3 5/5] clk: qcom: Add SDX55 APCS clock controller support Date: Mon, 18 Jan 2021 09:41:56 +0530 Message-Id: <20210118041156.50016-6-manivannan.sadhasivam@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210118041156.50016-1-manivannan.sadhasivam@linaro.org> References: <20210118041156.50016-1-manivannan.sadhasivam@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Add a driver for the SDX55 APCS clock controller. It is part of the APCS hardware block, which among other things implements also a combined mux and half integer divider functionality. The APCS clock controller has 3 parent clocks: 1. Board XO 2. Fixed rate GPLL0 3. A7 PLL This is required for enabling CPU frequency scaling on SDX55-based platforms. Signed-off-by: Manivannan Sadhasivam --- drivers/clk/qcom/Kconfig | 9 ++ drivers/clk/qcom/Makefile | 1 + drivers/clk/qcom/apcs-sdx55.c | 149 ++++++++++++++++++++++++++++++++++ 3 files changed, 159 insertions(+) create mode 100644 drivers/clk/qcom/apcs-sdx55.c diff --git a/drivers/clk/qcom/Kconfig b/drivers/clk/qcom/Kconfig index d6f4aee4427a..ac43b715bff6 100644 --- a/drivers/clk/qcom/Kconfig +++ b/drivers/clk/qcom/Kconfig @@ -54,6 +54,15 @@ config QCOM_CLK_APCC_MSM8996 Say Y if you want to support CPU clock scaling using CPUfreq drivers for dynamic power management. +config QCOM_CLK_APCS_SDX55 + tristate "SDX55 APCS Clock Controller" + depends on QCOM_APCS_IPC || COMPILE_TEST + help + Support for the APCS Clock Controller on SDX55 platform. The + APCS is managing the mux and divider which feeds the CPUs. + Say Y if you want to support CPU frequency scaling on devices + such as SDX55. + config QCOM_CLK_RPM tristate "RPM based Clock Controller" depends on MFD_QCOM_RPM diff --git a/drivers/clk/qcom/Makefile b/drivers/clk/qcom/Makefile index e7e0ac382176..4de926da4b15 100644 --- a/drivers/clk/qcom/Makefile +++ b/drivers/clk/qcom/Makefile @@ -47,6 +47,7 @@ obj-$(CONFIG_QCOM_A53PLL) += a53-pll.o obj-$(CONFIG_QCOM_A7PLL) += a7-pll.o obj-$(CONFIG_QCOM_CLK_APCS_MSM8916) += apcs-msm8916.o obj-$(CONFIG_QCOM_CLK_APCC_MSM8996) += clk-cpu-8996.o +obj-$(CONFIG_QCOM_CLK_APCS_SDX55) += apcs-sdx55.o obj-$(CONFIG_QCOM_CLK_RPM) += clk-rpm.o obj-$(CONFIG_QCOM_CLK_RPMH) += clk-rpmh.o obj-$(CONFIG_QCOM_CLK_SMD_RPM) += clk-smd-rpm.o diff --git a/drivers/clk/qcom/apcs-sdx55.c b/drivers/clk/qcom/apcs-sdx55.c new file mode 100644 index 000000000000..e111e124cb7a --- /dev/null +++ b/drivers/clk/qcom/apcs-sdx55.c @@ -0,0 +1,149 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Qualcomm SDX55 APCS clock controller driver + * + * Copyright (c) 2020, Linaro Limited + * Author: Manivannan Sadhasivam + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "clk-regmap.h" +#include "clk-regmap-mux-div.h" + +static const u32 apcs_mux_clk_parent_map[] = { 0, 1, 5 }; + +static const struct clk_parent_data pdata[] = { + { .fw_name = "ref" }, + { .fw_name = "aux" }, + { .fw_name = "pll" }, +}; + +/* + * We use the notifier function for switching to a temporary safe configuration + * (mux and divider), while the A7 PLL is reconfigured. + */ +static int a7cc_notifier_cb(struct notifier_block *nb, unsigned long event, + void *data) +{ + int ret = 0; + struct clk_regmap_mux_div *md = container_of(nb, + struct clk_regmap_mux_div, + clk_nb); + if (event == PRE_RATE_CHANGE) + /* set the mux and divider to safe frequency (400mhz) */ + ret = mux_div_set_src_div(md, 1, 2); + + return notifier_from_errno(ret); +} + +static int qcom_apcs_sdx55_clk_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct device *parent = dev->parent; + struct device *cpu_dev; + struct clk_regmap_mux_div *a7cc; + struct regmap *regmap; + struct clk_init_data init = { }; + int ret; + + regmap = dev_get_regmap(parent, NULL); + if (!regmap) { + dev_err_probe(dev, ret, "Failed to get parent regmap\n"); + return -ENODEV; + } + + a7cc = devm_kzalloc(dev, sizeof(*a7cc), GFP_KERNEL); + if (!a7cc) + return -ENOMEM; + + init.name = "a7mux"; + init.parent_data = pdata; + init.num_parents = ARRAY_SIZE(pdata); + init.ops = &clk_regmap_mux_div_ops; + + a7cc->clkr.hw.init = &init; + a7cc->clkr.regmap = regmap; + a7cc->reg_offset = 0x8; + a7cc->hid_width = 5; + a7cc->hid_shift = 0; + a7cc->src_width = 3; + a7cc->src_shift = 8; + a7cc->parent_map = apcs_mux_clk_parent_map; + + a7cc->pclk = devm_clk_get(parent, "pll"); + if (IS_ERR(a7cc->pclk)) { + ret = PTR_ERR(a7cc->pclk); + if (ret != -EPROBE_DEFER) + dev_err_probe(dev, ret, "Failed to get PLL clk\n"); + return ret; + } + + a7cc->clk_nb.notifier_call = a7cc_notifier_cb; + ret = clk_notifier_register(a7cc->pclk, &a7cc->clk_nb); + if (ret) { + dev_err_probe(dev, ret, "Failed to register clock notifier\n"); + return ret; + } + + ret = devm_clk_register_regmap(dev, &a7cc->clkr); + if (ret) { + dev_err_probe(dev, ret, "Failed to register regmap clock\n"); + goto err; + } + + ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get, + &a7cc->clkr.hw); + if (ret) { + dev_err_probe(dev, ret, "Failed to add clock provider\n"); + goto err; + } + + platform_set_drvdata(pdev, a7cc); + + /* + * Attach the power domain to cpudev. Since there is no dedicated driver + * for CPUs and the SDX55 platform lacks hardware specific CPUFreq + * driver, there seems to be no better place to do this. So do it here! + */ + cpu_dev = get_cpu_device(0); + dev_pm_domain_attach(cpu_dev, true); + + return 0; + +err: + clk_notifier_unregister(a7cc->pclk, &a7cc->clk_nb); + return ret; +} + +static int qcom_apcs_sdx55_clk_remove(struct platform_device *pdev) +{ + struct device *cpu_dev = get_cpu_device(0); + struct clk_regmap_mux_div *a7cc = platform_get_drvdata(pdev); + + clk_notifier_unregister(a7cc->pclk, &a7cc->clk_nb); + dev_pm_domain_detach(cpu_dev, true); + + return 0; +} + +static struct platform_driver qcom_apcs_sdx55_clk_driver = { + .probe = qcom_apcs_sdx55_clk_probe, + .remove = qcom_apcs_sdx55_clk_remove, + .driver = { + .name = "qcom-sdx55-acps-clk", + }, +}; +module_platform_driver(qcom_apcs_sdx55_clk_driver); + +MODULE_AUTHOR("Manivannan Sadhasivam "); +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("Qualcomm SDX55 APCS clock driver");