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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: Gregory CLEMENT <gregory.clement@free-electrons.com> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
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/* | ||
* 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. | ||
*/ | ||
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#include <linux/clk-provider.h> | ||
#include <linux/mfd/syscon.h> | ||
#include <linux/platform_device.h> | ||
#include <linux/regmap.h> | ||
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#define NB_GPIO1_LATCH 0xC | ||
#define XTAL_MODE BIT(31) | ||
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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; | ||
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xtal_hw = devm_kzalloc(&pdev->dev, sizeof(*xtal_hw), GFP_KERNEL); | ||
if (!xtal_hw) | ||
return -ENOMEM; | ||
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platform_set_drvdata(pdev, xtal_hw); | ||
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parent = np->parent; | ||
if (!parent) { | ||
dev_err(&pdev->dev, "no parent\n"); | ||
return -ENODEV; | ||
} | ||
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regmap = syscon_node_to_regmap(parent); | ||
if (IS_ERR(regmap)) { | ||
dev_err(&pdev->dev, "cannot get regmap\n"); | ||
return PTR_ERR(regmap); | ||
} | ||
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ret = regmap_read(regmap, NB_GPIO1_LATCH, ®); | ||
if (ret) { | ||
dev_err(&pdev->dev, "cannot read from regmap\n"); | ||
return ret; | ||
} | ||
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if (reg & XTAL_MODE) | ||
rate = 40000000; | ||
else | ||
rate = 25000000; | ||
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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); | ||
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return ret; | ||
} | ||
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static int armada_3700_xtal_clock_remove(struct platform_device *pdev) | ||
{ | ||
of_clk_del_provider(pdev->dev.of_node); | ||
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return 0; | ||
} | ||
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static const struct of_device_id armada_3700_xtal_clock_of_match[] = { | ||
{ .compatible = "marvell,armada-3700-xtal-clock", }, | ||
{ } | ||
}; | ||
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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, | ||
}, | ||
}; | ||
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builtin_platform_driver(armada_3700_xtal_clock_driver); |