// SPDX-License-Identifier: GPL-2.0-only /* * Layerscape FlexSPI clock driver * * Copyright 2020 Michael Walle <michael@walle.cc> */ #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 <michael@walle.cc>"); MODULE_LICENSE("GPL");