Commit 83ccf16c authored by Javier Martinez Canillas's avatar Javier Martinez Canillas Committed by Mike Turquette

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: default avatarJavier Martinez Canillas <javier.martinez@collabora.co.uk>
Reviewed-by: default avatarKrzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: default avatarMike Turquette <mturquette@linaro.org>
parent fcd0864c
......@@ -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
......
......@@ -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
......
/*
* clk-max77802.c - Clock driver for Maxim 77802
*
* Copyright (C) 2014 Google, Inc
*
* Copyright (C) 2012 Samsung Electornics
* Jonghwa Lee <jonghwa3.lee@samsung.com>
*
* 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 <linux/kernel.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/mfd/max77686-private.h>
#include <linux/clk-provider.h>
#include <linux/mutex.h>
#include <linux/clkdev.h>
#include <dt-bindings/clock/maxim,max77802.h>
#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 <javier.martinez@collabora.co.uk>");
MODULE_LICENSE("GPL");
/*
* 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 */
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