clk: Add driver for Maxim 77802 PMIC clocks
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 <javier.martinez@collabora.co.uk> Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Signed-off-by: Mike Turquette <mturquette@linaro.org>
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@ -42,6 +42,13 @@ config COMMON_CLK_MAX77686
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---help---
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This driver supports Maxim 77686 crystal oscillator clock.
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config COMMON_CLK_MAX77802
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tristate "Clock driver for Maxim 77802 PMIC"
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depends on MFD_MAX77686
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select COMMON_CLK_MAX_GEN
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---help---
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This driver supports Maxim 77802 crystal oscillator clock.
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config COMMON_CLK_SI5351
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tristate "Clock driver for SiLabs 5351A/B/C"
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depends on I2C
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@ -24,6 +24,7 @@ obj-$(CONFIG_ARCH_HIGHBANK) += clk-highbank.o
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obj-$(CONFIG_MACH_LOONGSON1) += clk-ls1x.o
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obj-$(CONFIG_COMMON_CLK_MAX_GEN) += clk-max-gen.o
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obj-$(CONFIG_COMMON_CLK_MAX77686) += clk-max77686.o
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obj-$(CONFIG_COMMON_CLK_MAX77802) += clk-max77802.o
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obj-$(CONFIG_ARCH_MOXART) += clk-moxart.o
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obj-$(CONFIG_ARCH_NOMADIK) += clk-nomadik.o
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obj-$(CONFIG_ARCH_NSPIRE) += clk-nspire.o
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98
drivers/clk/clk-max77802.c
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98
drivers/clk/clk-max77802.c
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@ -0,0 +1,98 @@
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/*
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* clk-max77802.c - Clock driver for Maxim 77802
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*
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* Copyright (C) 2014 Google, Inc
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*
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* Copyright (C) 2012 Samsung Electornics
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* Jonghwa Lee <jonghwa3.lee@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* This driver is based on clk-max77686.c
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/err.h>
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#include <linux/platform_device.h>
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#include <linux/mfd/max77686-private.h>
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#include <linux/clk-provider.h>
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#include <linux/mutex.h>
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#include <linux/clkdev.h>
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#include <dt-bindings/clock/maxim,max77802.h>
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#include "clk-max-gen.h"
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#define MAX77802_CLOCK_OPMODE_MASK 0x1
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#define MAX77802_CLOCK_LOW_JITTER_SHIFT 0x3
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static struct clk_init_data max77802_clks_init[MAX77802_CLKS_NUM] = {
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[MAX77802_CLK_32K_AP] = {
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.name = "32khz_ap",
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.ops = &max_gen_clk_ops,
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.flags = CLK_IS_ROOT,
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},
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[MAX77802_CLK_32K_CP] = {
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.name = "32khz_cp",
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.ops = &max_gen_clk_ops,
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.flags = CLK_IS_ROOT,
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},
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};
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static int max77802_clk_probe(struct platform_device *pdev)
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{
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struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
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int ret;
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ret = max_gen_clk_probe(pdev, iodev->regmap, MAX77802_REG_32KHZ,
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max77802_clks_init, MAX77802_CLKS_NUM);
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if (ret) {
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dev_err(&pdev->dev, "generic probe failed %d\n", ret);
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return ret;
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}
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/* Enable low-jitter mode on the 32khz clocks. */
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ret = regmap_update_bits(iodev->regmap, MAX77802_REG_32KHZ,
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1 << MAX77802_CLOCK_LOW_JITTER_SHIFT,
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1 << MAX77802_CLOCK_LOW_JITTER_SHIFT);
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if (ret < 0)
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dev_err(&pdev->dev, "failed to enable low-jitter mode\n");
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return ret;
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}
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static int max77802_clk_remove(struct platform_device *pdev)
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{
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return max_gen_clk_remove(pdev, MAX77802_CLKS_NUM);
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}
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static const struct platform_device_id max77802_clk_id[] = {
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{ "max77802-clk", 0},
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{ },
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};
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MODULE_DEVICE_TABLE(platform, max77802_clk_id);
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static struct platform_driver max77802_clk_driver = {
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.driver = {
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.name = "max77802-clk",
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.owner = THIS_MODULE,
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},
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.probe = max77802_clk_probe,
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.remove = max77802_clk_remove,
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.id_table = max77802_clk_id,
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};
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module_platform_driver(max77802_clk_driver);
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MODULE_DESCRIPTION("MAXIM 77802 Clock Driver");
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MODULE_AUTHOR("Javier Martinez Canillas <javier.martinez@collabora.co.uk>");
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MODULE_LICENSE("GPL");
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22
include/dt-bindings/clock/maxim,max77802.h
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22
include/dt-bindings/clock/maxim,max77802.h
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@ -0,0 +1,22 @@
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/*
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* Copyright (C) 2014 Google, Inc
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Device Tree binding constants clocks for the Maxim 77802 PMIC.
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*/
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#ifndef _DT_BINDINGS_CLOCK_MAXIM_MAX77802_CLOCK_H
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#define _DT_BINDINGS_CLOCK_MAXIM_MAX77802_CLOCK_H
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/* Fixed rate clocks. */
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#define MAX77802_CLK_32K_AP 0
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#define MAX77802_CLK_32K_CP 1
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/* Total number of clocks. */
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#define MAX77802_CLKS_NUM (MAX77802_CLK_32K_CP + 1)
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#endif /* _DT_BINDINGS_CLOCK_MAXIM_MAX77802_CLOCK_H */
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