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Commit 7ea82504 authored by Gregory CLEMENT's avatar Gregory CLEMENT Committed by Stephen Boyd
Browse files

clk: mvebu: Add the xtal clock for Armada 3700 SoC 



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: default avatarGregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: default avatarStephen Boyd <sboyd@codeaurora.org>
parent cedfbc30

drivers/clk/mvebu/Kconfig

+3 −0
Original line number Diff line number Diff line
@@ -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

drivers/clk/mvebu/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -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

drivers/clk/mvebu/armada-37xx-xtal.c

0 → 100644
+91 −0
Original line number Diff line number Diff line 
/*

 * Marvell Armada 37xx SoC xtal clocks

 *

 * Copyright (C) 2016 Marvell

 *

 * Gregory CLEMENT <gregory.clement@free-electrons.com>

 *

 * 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-provider.h>

#include <linux/mfd/syscon.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, &reg);

	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", },

	{ }

};



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,

	},

};



builtin_platform_driver(armada_3700_xtal_clock_driver);