clk: fsl-flexspi: new driver (fcf77be8) · Commits · 戴 / test

drivers/clk/Kconfig

+8 −0

Original line number	Diff line number	Diff line
		@@ -188,6 +188,14 @@ config COMMON_CLK_CS2000_CP
		help
		If you say yes here you get support for the CS2000 clock multiplier.

		config COMMON_CLK_FSL_FLEXSPI
		tristate "Clock driver for FlexSPI on Layerscape SoCs"
		depends on ARCH_LAYERSCAPE \|\| COMPILE_TEST
		default ARCH_LAYERSCAPE && SPI_NXP_FLEXSPI
		help
		On Layerscape SoCs there is a special clock for the FlexSPI
		interface.

		config COMMON_CLK_FSL_SAI
		bool "Clock driver for BCLK of Freescale SAI cores"
		depends on ARCH_LAYERSCAPE \|\| COMPILE_TEST

drivers/clk/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -30,6 +30,7 @@ obj-$(CONFIG_COMMON_CLK_CS2000_CP) += clk-cs2000-cp.o
		obj-$(CONFIG_ARCH_EFM32) += clk-efm32gg.o
		obj-$(CONFIG_ARCH_SPARX5) += clk-sparx5.o
		obj-$(CONFIG_COMMON_CLK_FIXED_MMIO) += clk-fixed-mmio.o
		obj-$(CONFIG_COMMON_CLK_FSL_FLEXSPI) += clk-fsl-flexspi.o
		obj-$(CONFIG_COMMON_CLK_FSL_SAI) += clk-fsl-sai.o
		obj-$(CONFIG_COMMON_CLK_GEMINI) += clk-gemini.o
		obj-$(CONFIG_COMMON_CLK_ASPEED) += clk-aspeed.o

drivers/clk/clk-fsl-flexspi.c

0 → 100644

+106 −0

Original line number	Diff line number	Diff line
		// 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");

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