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clk-fsl-flexspi.c
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clk-fsl-flexspi.c
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// SPDX-License-Identifier: GPL-2.0-only
/*
* Layerscape FlexSPI clock driver
*
* Copyright 2020 Michael Walle <[email protected]>
*/
#include <linux/clk-provider.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>
static const struct clk_div_table ls1028a_flexspi_divs[] = {
{ .val = 0, .div = 1, },
{ .val = 1, .div = 2, },
{ .val = 2, .div = 3, },
{ .val = 3, .div = 4, },
{ .val = 4, .div = 5, },
{ .val = 5, .div = 6, },
{ .val = 6, .div = 7, },
{ .val = 7, .div = 8, },
{ .val = 11, .div = 12, },
{ .val = 15, .div = 16, },
{ .val = 16, .div = 20, },
{ .val = 17, .div = 24, },
{ .val = 18, .div = 28, },
{ .val = 19, .div = 32, },
{ .val = 20, .div = 80, },
{}
};
static const struct clk_div_table lx2160a_flexspi_divs[] = {
{ .val = 1, .div = 2, },
{ .val = 3, .div = 4, },
{ .val = 5, .div = 6, },
{ .val = 7, .div = 8, },
{ .val = 11, .div = 12, },
{ .val = 15, .div = 16, },
{ .val = 16, .div = 20, },
{ .val = 17, .div = 24, },
{ .val = 18, .div = 28, },
{ .val = 19, .div = 32, },
{ .val = 20, .div = 80, },
{}
};
static int fsl_flexspi_clk_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
const char *clk_name = np->name;
const char *clk_parent;
struct resource *res;
void __iomem *reg;
struct clk_hw *hw;
const struct clk_div_table *divs;
divs = device_get_match_data(dev);
if (!divs)
return -ENOENT;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -ENOENT;
/*
* Can't use devm_ioremap_resource() or devm_of_iomap() because the
* resource might already be taken by the parent device.
*/
reg = devm_ioremap(dev, res->start, resource_size(res));
if (!reg)
return -ENOMEM;
clk_parent = of_clk_get_parent_name(np, 0);
if (!clk_parent)
return -EINVAL;
of_property_read_string(np, "clock-output-names", &clk_name);
hw = devm_clk_hw_register_divider_table(dev, clk_name, clk_parent, 0,
reg, 0, 5, 0, divs, NULL);
if (IS_ERR(hw))
return PTR_ERR(hw);
return devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get, hw);
}
static const struct of_device_id fsl_flexspi_clk_dt_ids[] = {
{ .compatible = "fsl,ls1028a-flexspi-clk", .data = &ls1028a_flexspi_divs },
{ .compatible = "fsl,lx2160a-flexspi-clk", .data = &lx2160a_flexspi_divs },
{}
};
MODULE_DEVICE_TABLE(of, fsl_flexspi_clk_dt_ids);
static struct platform_driver fsl_flexspi_clk_driver = {
.driver = {
.name = "fsl-flexspi-clk",
.of_match_table = fsl_flexspi_clk_dt_ids,
},
.probe = fsl_flexspi_clk_probe,
};
module_platform_driver(fsl_flexspi_clk_driver);
MODULE_DESCRIPTION("FlexSPI clock driver for Layerscape SoCs");
MODULE_AUTHOR("Michael Walle <[email protected]>");
MODULE_LICENSE("GPL");