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