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- /*
- * Copyright (C) 2014 Chen-Yu Tsai
- * Author: Chen-Yu Tsai <wens@csie.org>
- *
- * Allwinner A23 APB0 clock driver
- *
- * License Terms: GNU General Public License v2
- *
- * Based on clk-sun6i-apb0.c
- * Allwinner A31 APB0 clock driver
- *
- * Copyright (C) 2014 Free Electrons
- * Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
- *
- */
- #include <linux/clk-provider.h>
- #include <linux/init.h>
- #include <linux/of.h>
- #include <linux/of_address.h>
- #include <linux/platform_device.h>
- static struct clk *sun8i_a23_apb0_register(struct device_node *node,
- void __iomem *reg)
- {
- const char *clk_name = node->name;
- const char *clk_parent;
- struct clk *clk;
- int ret;
- clk_parent = of_clk_get_parent_name(node, 0);
- if (!clk_parent)
- return ERR_PTR(-EINVAL);
- of_property_read_string(node, "clock-output-names", &clk_name);
- /* The A23 APB0 clock is a standard 2 bit wide divider clock */
- clk = clk_register_divider(NULL, clk_name, clk_parent, 0, reg,
- 0, 2, 0, NULL);
- if (IS_ERR(clk))
- return clk;
- ret = of_clk_add_provider(node, of_clk_src_simple_get, clk);
- if (ret)
- goto err_unregister;
- return clk;
- err_unregister:
- clk_unregister_divider(clk);
- return ERR_PTR(ret);
- }
- static void sun8i_a23_apb0_setup(struct device_node *node)
- {
- void __iomem *reg;
- struct resource res;
- struct clk *clk;
- reg = of_io_request_and_map(node, 0, of_node_full_name(node));
- if (IS_ERR(reg)) {
- /*
- * This happens with clk nodes instantiated through mfd,
- * as those do not have their resources assigned in the
- * device tree. Do not print an error in this case.
- */
- if (PTR_ERR(reg) != -EINVAL)
- pr_err("Could not get registers for a23-apb0-clk\n");
- return;
- }
- clk = sun8i_a23_apb0_register(node, reg);
- if (IS_ERR(clk))
- goto err_unmap;
- return;
- err_unmap:
- iounmap(reg);
- of_address_to_resource(node, 0, &res);
- release_mem_region(res.start, resource_size(&res));
- }
- CLK_OF_DECLARE_DRIVER(sun8i_a23_apb0, "allwinner,sun8i-a23-apb0-clk",
- sun8i_a23_apb0_setup);
- static int sun8i_a23_apb0_clk_probe(struct platform_device *pdev)
- {
- struct device_node *np = pdev->dev.of_node;
- struct resource *r;
- void __iomem *reg;
- struct clk *clk;
- r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- reg = devm_ioremap_resource(&pdev->dev, r);
- if (IS_ERR(reg))
- return PTR_ERR(reg);
- clk = sun8i_a23_apb0_register(np, reg);
- if (IS_ERR(clk))
- return PTR_ERR(clk);
- return 0;
- }
- static const struct of_device_id sun8i_a23_apb0_clk_dt_ids[] = {
- { .compatible = "allwinner,sun8i-a23-apb0-clk" },
- { /* sentinel */ }
- };
- static struct platform_driver sun8i_a23_apb0_clk_driver = {
- .driver = {
- .name = "sun8i-a23-apb0-clk",
- .of_match_table = sun8i_a23_apb0_clk_dt_ids,
- },
- .probe = sun8i_a23_apb0_clk_probe,
- };
- builtin_platform_driver(sun8i_a23_apb0_clk_driver);
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