Quoting Gregory CLEMENT (2016-07-07 15:37:47)
> This clock is the parent of all the Armada 3700 clocks. It is a fixed
> rate clock which depends on the gpio configuration read when resetting
> the SoC.
>
> Signed-off-by: Gregory CLEMENT <gregory.clement@xxxxxxxxxxxxxxxxxx>
> ---
> drivers/clk/mvebu/Kconfig | 3 ++
> drivers/clk/mvebu/Makefile | 1 +
> drivers/clk/mvebu/armada-37xx-xtal.c | 98 ++++++++++++++++++++++++++++++++++++
> 3 files changed, 102 insertions(+)
> create mode 100644 drivers/clk/mvebu/armada-37xx-xtal.c
>
> diff --git a/drivers/clk/mvebu/Kconfig b/drivers/clk/mvebu/Kconfig
> index 3165da77d525..fddc8ac5faff 100644
> --- a/drivers/clk/mvebu/Kconfig
> +++ b/drivers/clk/mvebu/Kconfig
> @@ -24,6 +24,9 @@ config ARMADA_39X_CLK
> bool
> select MVEBU_CLK_COMMON
>
> +config ARMADA_37XX_CLK
> + bool
> +
> config ARMADA_XP_CLK
> bool
> select MVEBU_CLK_COMMON
> diff --git a/drivers/clk/mvebu/Makefile b/drivers/clk/mvebu/Makefile
> index 7172ef65693d..4257a36d0219 100644
> --- a/drivers/clk/mvebu/Makefile
> +++ b/drivers/clk/mvebu/Makefile
> @@ -6,6 +6,7 @@ obj-$(CONFIG_ARMADA_370_CLK) += armada-370.o
> obj-$(CONFIG_ARMADA_375_CLK) += armada-375.o
> obj-$(CONFIG_ARMADA_38X_CLK) += armada-38x.o
> obj-$(CONFIG_ARMADA_39X_CLK) += armada-39x.o
> +obj-$(CONFIG_ARMADA_37XX_CLK) += armada-37xx-xtal.o
> obj-$(CONFIG_ARMADA_XP_CLK) += armada-xp.o
> obj-$(CONFIG_ARMADA_AP806_SYSCON) += ap806-system-controller.o
> obj-$(CONFIG_ARMADA_CP110_SYSCON) += cp110-system-controller.o
> diff --git a/drivers/clk/mvebu/armada-37xx-xtal.c b/drivers/clk/mvebu/armada-37xx-xtal.c
> new file mode 100644
> index 000000000000..f832c219420f
> --- /dev/null
> +++ b/drivers/clk/mvebu/armada-37xx-xtal.c
> @@ -0,0 +1,98 @@
> +/*
> + * Marvell Armada 37xx SoC xtal clocks
> + *
> + * Copyright (C) 2016 Marvell
> + *
> + * Gregory CLEMENT <gregory.clement@xxxxxxxxxxxxxxxxxx>
> + *
> + * This file is licensed under the terms of the GNU General Public
> + * License version 2. This program is licensed "as is" without any
> + * warranty of any kind, whether express or implied.
> + */
> +
> +#include <linux/clk.h>
Is clk.h necessary? Is this driver also a clock consumer?
Regards,
Mike
> +#include <linux/clk-provider.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +
> +#define NB_GPIO1_LATCH 0xC
> +#define XTAL_MODE BIT(31)
> +
> +static int armada_3700_xtal_clock_probe(struct platform_device *pdev)
> +{
> + struct device_node *np = pdev->dev.of_node;
> + const char *xtal_name = "xtal";
> + struct device_node *parent;
> + struct regmap *regmap;
> + struct clk_hw *xtal_hw;
> + unsigned int rate;
> + u32 reg;
> + int ret;
> +
> + xtal_hw = devm_kzalloc(&pdev->dev, sizeof(*xtal_hw), GFP_KERNEL);
> + if (!xtal_hw)
> + return -ENOMEM;
> +
> + platform_set_drvdata(pdev, xtal_hw);
> +
> + parent = np->parent;
> + if (!parent) {
> + dev_err(&pdev->dev, "no parent\n");
> + return -ENODEV;
> + }
> +
> + regmap = syscon_node_to_regmap(parent);
> + if (IS_ERR(regmap)) {
> + dev_err(&pdev->dev, "cannot get regmap\n");
> + return PTR_ERR(regmap);
> + }
> +
> + ret = regmap_read(regmap, NB_GPIO1_LATCH, ®);
> + if (ret) {
> + dev_err(&pdev->dev, "cannot read from regmap\n");
> + return ret;
> + }
> +
> + if (reg & XTAL_MODE)
> + rate = 40000000;
> + else
> + rate = 25000000;
> +
> + of_property_read_string_index(np, "clock-output-names", 0, &xtal_name);
> + xtal_hw = clk_hw_register_fixed_rate(NULL, xtal_name, NULL, 0, rate);
> + if (IS_ERR(xtal_hw))
> + return PTR_ERR(xtal_hw);
> + ret = of_clk_add_hw_provider(np, of_clk_hw_simple_get, xtal_hw);
> +
> + return ret;
> +}
> +
> +static int armada_3700_xtal_clock_remove(struct platform_device *pdev)
> +{
> + of_clk_del_provider(pdev->dev.of_node);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id armada_3700_xtal_clock_of_match[] = {
> + { .compatible = "marvell,armada-3700-xtal-clock", },
> + { }
> +};
> +MODULE_DEVICE_TABLE(of, armada_3700_xtal_clock_of_match);
> +
> +static struct platform_driver armada_3700_xtal_clock_driver = {
> + .probe = armada_3700_xtal_clock_probe,
> + .remove = armada_3700_xtal_clock_remove,
> + .driver = {
> + .name = "marvell-armada-3700-xtal-clock",
> + .of_match_table = armada_3700_xtal_clock_of_match,
> + },
> +};
> +
> +module_platform_driver(armada_3700_xtal_clock_driver);
> +
> +MODULE_AUTHOR("Gregory CLEMENT <gregory.clement@xxxxxxxxxxxxxxxxxx>");
> +MODULE_DESCRIPTION("Marvell Armada 37xx SoC xtal clocks driver");
> +MODULE_LICENSE("GPL v2");
> --
> 2.5.0
>
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