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path: root/drivers/clk/clk-fsl-flexspi.c
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Diffstat (limited to 'drivers/clk/clk-fsl-flexspi.c')
-rw-r--r--drivers/clk/clk-fsl-flexspi.c106
1 files changed, 106 insertions, 0 deletions
diff --git a/drivers/clk/clk-fsl-flexspi.c b/drivers/clk/clk-fsl-flexspi.c
new file mode 100644
index 0000000000..8432d681e2
--- /dev/null
+++ b/drivers/clk/clk-fsl-flexspi.c
@@ -0,0 +1,106 @@
+// 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");