[PATCH v4 11/14] clk: Add driver for Maxim 77802 PMIC clocks
Krzysztof Kozlowski
k.kozlowski at samsung.com
Thu Jun 26 03:40:19 PDT 2014
On śro, 2014-06-25 at 21:03 +0200, Javier Martinez Canillas wrote:
> 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 at collabora.co.uk>
> ---
>
> 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 | 99 ++++++++++++++++++++++++++++++
> include/dt-bindings/clock/maxim,max77802.h | 22 +++++++
> 4 files changed, 129 insertions(+)
> create mode 100644 drivers/clk/clk-max77802.c
> create mode 100644 include/dt-bindings/clock/maxim,max77802.h
Reviewed-by: Krzysztof Kozlowski <k.kozlowski at samsung.com>
Best regards,
Krzysztof
>
> diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
> index 3fd4270..221260b 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 MFD"
> + depends on MFD_MAX77802
> + 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 6c1aff6..520ff76 100644
> --- a/drivers/clk/Makefile
> +++ b/drivers/clk/Makefile
> @@ -20,6 +20,7 @@ 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..4253b44
> --- /dev/null
> +++ b/drivers/clk/clk-max77802.c
> @@ -0,0 +1,99 @@
> +/*
> + * clk-max77802.c - Clock driver for Maxim 77802
> + *
> + * Copyright (C) 2014 Google, Inc
> + *
> + * Copyright (C) 2012 Samsung Electornics
> + * Jonghwa Lee <jonghwa3.lee at 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/max77802.h>
> +#include <linux/mfd/max77802-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 max77802_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 at collabora.co.uk>");
> +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 */
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