^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright (C) 2014 Chen-Yu Tsai
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Author: Chen-Yu Tsai <wens@csie.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Allwinner A23 APB0 clock driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Based on clk-sun6i-apb0.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Allwinner A31 APB0 clock driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * Copyright (C) 2014 Free Electrons
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/clk-provider.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/of_address.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) static struct clk *sun8i_a23_apb0_register(struct device_node *node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) void __iomem *reg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) const char *clk_name = node->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) const char *clk_parent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) struct clk *clk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) clk_parent = of_clk_get_parent_name(node, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) if (!clk_parent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) of_property_read_string(node, "clock-output-names", &clk_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) /* The A23 APB0 clock is a standard 2 bit wide divider clock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) clk = clk_register_divider(NULL, clk_name, clk_parent, 0, reg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 0, 2, 0, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) if (IS_ERR(clk))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) return clk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) ret = of_clk_add_provider(node, of_clk_src_simple_get, clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) goto err_unregister;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) return clk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) err_unregister:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) clk_unregister_divider(clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) return ERR_PTR(ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) static void sun8i_a23_apb0_setup(struct device_node *node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) void __iomem *reg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) struct resource res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) struct clk *clk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) reg = of_io_request_and_map(node, 0, of_node_full_name(node));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) if (IS_ERR(reg)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) * This happens with clk nodes instantiated through mfd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) * as those do not have their resources assigned in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) * device tree. Do not print an error in this case.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) if (PTR_ERR(reg) != -EINVAL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) pr_err("Could not get registers for a23-apb0-clk\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) clk = sun8i_a23_apb0_register(node, reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) if (IS_ERR(clk))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) goto err_unmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) err_unmap:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) iounmap(reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) of_address_to_resource(node, 0, &res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) release_mem_region(res.start, resource_size(&res));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) CLK_OF_DECLARE_DRIVER(sun8i_a23_apb0, "allwinner,sun8i-a23-apb0-clk",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) sun8i_a23_apb0_setup);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) static int sun8i_a23_apb0_clk_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) struct device_node *np = pdev->dev.of_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) struct resource *r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) void __iomem *reg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) struct clk *clk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) reg = devm_ioremap_resource(&pdev->dev, r);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) if (IS_ERR(reg))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) return PTR_ERR(reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) clk = sun8i_a23_apb0_register(np, reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) return PTR_ERR_OR_ZERO(clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) static const struct of_device_id sun8i_a23_apb0_clk_dt_ids[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) { .compatible = "allwinner,sun8i-a23-apb0-clk" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) { /* sentinel */ }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) static struct platform_driver sun8i_a23_apb0_clk_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) .name = "sun8i-a23-apb0-clk",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) .of_match_table = sun8i_a23_apb0_clk_dt_ids,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) .probe = sun8i_a23_apb0_clk_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) builtin_platform_driver(sun8i_a23_apb0_clk_driver);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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