From patchwork Mon Aug 18 08:33:03 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Javier Martinez Canillas X-Patchwork-Id: 4733391 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 88D26C0338 for ; Mon, 18 Aug 2014 08:39:11 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 87E3C20123 for ; Mon, 18 Aug 2014 08:39:10 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 818A52010E for ; Mon, 18 Aug 2014 08:39:09 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1XJIOW-0001DC-Lg; Mon, 18 Aug 2014 08:34:24 +0000 Received: from bhuna.collabora.co.uk ([93.93.135.160]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1XJINu-0000om-03 for linux-arm-kernel@lists.infradead.org; Mon, 18 Aug 2014 08:33:47 +0000 Received: from [127.0.0.1] (localhost [127.0.0.1]) (Authenticated sender: javier) with ESMTPSA id 7A030603339 From: Javier Martinez Canillas To: Mike Turquette Subject: [PATCH v9 5/6] clk: Add driver for Maxim 77802 PMIC clocks Date: Mon, 18 Aug 2014 10:33:03 +0200 Message-Id: <1408350784-15577-6-git-send-email-javier.martinez@collabora.co.uk> X-Mailer: git-send-email 2.0.1 In-Reply-To: <1408350784-15577-1-git-send-email-javier.martinez@collabora.co.uk> References: <1408350784-15577-1-git-send-email-javier.martinez@collabora.co.uk> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140818_013346_415907_9256112B X-CRM114-Status: GOOD ( 17.17 ) X-Spam-Score: -0.7 (/) Cc: devicetree@vger.kernel.org, linux-samsung-soc@vger.kernel.org, Yadwinder Singh Brar , Doug Anderson , linux-kernel@vger.kernel.org, Olof Johansson , Javier Martinez Canillas , linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-2.6 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_NONE, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The MAX77802 PMIC has two 32.768kHz Buffered Clock Outputs with Low Jitter Mode. This patch adds support for these two clocks. Signed-off-by: Javier Martinez Canillas Reviewed-by: Krzysztof Kozlowski Acked-by: Mike Turquette --- Changes since v6: None Changes since v5: None Changes since v4: None Changes since v3: None Changes since v2: None Changes since v1: - Use module_platform_driver() instead of having init/exit functions. Suggested by Mark Brown. - Use the generic maxim clock driver to reduce code duplication with clk-max77686.c driver. --- drivers/clk/Kconfig | 7 +++ drivers/clk/Makefile | 1 + drivers/clk/clk-max77802.c | 98 ++++++++++++++++++++++++++++++ include/dt-bindings/clock/maxim,max77802.h | 22 +++++++ 4 files changed, 128 insertions(+) create mode 100644 drivers/clk/clk-max77802.c create mode 100644 include/dt-bindings/clock/maxim,max77802.h diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig index d68b14b..85131ae 100644 --- a/drivers/clk/Kconfig +++ b/drivers/clk/Kconfig @@ -42,6 +42,13 @@ config COMMON_CLK_MAX77686 ---help--- This driver supports Maxim 77686 crystal oscillator clock. +config COMMON_CLK_MAX77802 + tristate "Clock driver for Maxim 77802 PMIC" + depends on MFD_MAX77686 + select COMMON_CLK_MAX_GEN + ---help--- + This driver supports Maxim 77802 crystal oscillator clock. + config COMMON_CLK_SI5351 tristate "Clock driver for SiLabs 5351A/B/C" depends on I2C diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile index 9de85f6..27c542b 100644 --- a/drivers/clk/Makefile +++ b/drivers/clk/Makefile @@ -24,6 +24,7 @@ obj-$(CONFIG_ARCH_HIGHBANK) += clk-highbank.o obj-$(CONFIG_MACH_LOONGSON1) += clk-ls1x.o obj-$(CONFIG_COMMON_CLK_MAX_GEN) += clk-max-gen.o obj-$(CONFIG_COMMON_CLK_MAX77686) += clk-max77686.o +obj-$(CONFIG_COMMON_CLK_MAX77802) += clk-max77802.o obj-$(CONFIG_ARCH_MOXART) += clk-moxart.o obj-$(CONFIG_ARCH_NOMADIK) += clk-nomadik.o obj-$(CONFIG_ARCH_NSPIRE) += clk-nspire.o diff --git a/drivers/clk/clk-max77802.c b/drivers/clk/clk-max77802.c new file mode 100644 index 0000000..8e480c5 --- /dev/null +++ b/drivers/clk/clk-max77802.c @@ -0,0 +1,98 @@ +/* + * clk-max77802.c - Clock driver for Maxim 77802 + * + * Copyright (C) 2014 Google, Inc + * + * Copyright (C) 2012 Samsung Electornics + * Jonghwa Lee + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * This driver is based on clk-max77686.c + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include "clk-max-gen.h" + +#define MAX77802_CLOCK_OPMODE_MASK 0x1 +#define MAX77802_CLOCK_LOW_JITTER_SHIFT 0x3 + +static struct clk_init_data max77802_clks_init[MAX77802_CLKS_NUM] = { + [MAX77802_CLK_32K_AP] = { + .name = "32khz_ap", + .ops = &max_gen_clk_ops, + .flags = CLK_IS_ROOT, + }, + [MAX77802_CLK_32K_CP] = { + .name = "32khz_cp", + .ops = &max_gen_clk_ops, + .flags = CLK_IS_ROOT, + }, +}; + +static int max77802_clk_probe(struct platform_device *pdev) +{ + struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent); + int ret; + + ret = max_gen_clk_probe(pdev, iodev->regmap, MAX77802_REG_32KHZ, + max77802_clks_init, MAX77802_CLKS_NUM); + + if (ret) { + dev_err(&pdev->dev, "generic probe failed %d\n", ret); + return ret; + } + + /* Enable low-jitter mode on the 32khz clocks. */ + ret = regmap_update_bits(iodev->regmap, MAX77802_REG_32KHZ, + 1 << MAX77802_CLOCK_LOW_JITTER_SHIFT, + 1 << MAX77802_CLOCK_LOW_JITTER_SHIFT); + if (ret < 0) + dev_err(&pdev->dev, "failed to enable low-jitter mode\n"); + + return ret; +} + +static int max77802_clk_remove(struct platform_device *pdev) +{ + return max_gen_clk_remove(pdev, MAX77802_CLKS_NUM); +} + +static const struct platform_device_id max77802_clk_id[] = { + { "max77802-clk", 0}, + { }, +}; +MODULE_DEVICE_TABLE(platform, max77802_clk_id); + +static struct platform_driver max77802_clk_driver = { + .driver = { + .name = "max77802-clk", + .owner = THIS_MODULE, + }, + .probe = max77802_clk_probe, + .remove = max77802_clk_remove, + .id_table = max77802_clk_id, +}; + +module_platform_driver(max77802_clk_driver); + +MODULE_DESCRIPTION("MAXIM 77802 Clock Driver"); +MODULE_AUTHOR("Javier Martinez Canillas "); +MODULE_LICENSE("GPL"); diff --git a/include/dt-bindings/clock/maxim,max77802.h b/include/dt-bindings/clock/maxim,max77802.h new file mode 100644 index 0000000..997312e --- /dev/null +++ b/include/dt-bindings/clock/maxim,max77802.h @@ -0,0 +1,22 @@ +/* + * Copyright (C) 2014 Google, Inc + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Device Tree binding constants clocks for the Maxim 77802 PMIC. + */ + +#ifndef _DT_BINDINGS_CLOCK_MAXIM_MAX77802_CLOCK_H +#define _DT_BINDINGS_CLOCK_MAXIM_MAX77802_CLOCK_H + +/* Fixed rate clocks. */ + +#define MAX77802_CLK_32K_AP 0 +#define MAX77802_CLK_32K_CP 1 + +/* Total number of clocks. */ +#define MAX77802_CLKS_NUM (MAX77802_CLK_32K_CP + 1) + +#endif /* _DT_BINDINGS_CLOCK_MAXIM_MAX77802_CLOCK_H */