1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright (C) 2015 Broadcom 4 */ 5 6 #include <linux/clk.h> 7 #include <linux/clk-provider.h> 8 #include <linux/module.h> 9 #include <linux/platform_device.h> 10 #include <dt-bindings/clock/bcm2835-aux.h> 11 12 #define BCM2835_AUXIRQ 0x00 13 #define BCM2835_AUXENB 0x04 14 15 static int bcm2835_aux_clk_probe(struct platform_device *pdev) 16 { 17 struct device *dev = &pdev->dev; 18 struct clk_hw_onecell_data *onecell; 19 const char *parent; 20 struct clk *parent_clk; 21 struct resource *res; 22 void __iomem *reg, *gate; 23 24 parent_clk = devm_clk_get(dev, NULL); 25 if (IS_ERR(parent_clk)) 26 return PTR_ERR(parent_clk); 27 parent = __clk_get_name(parent_clk); 28 29 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 30 reg = devm_ioremap_resource(dev, res); 31 if (IS_ERR(reg)) 32 return PTR_ERR(reg); 33 34 onecell = devm_kmalloc(dev, 35 struct_size(onecell, hws, 36 BCM2835_AUX_CLOCK_COUNT), 37 GFP_KERNEL); 38 if (!onecell) 39 return -ENOMEM; 40 onecell->num = BCM2835_AUX_CLOCK_COUNT; 41 42 gate = reg + BCM2835_AUXENB; 43 onecell->hws[BCM2835_AUX_CLOCK_UART] = 44 clk_hw_register_gate(dev, "aux_uart", parent, 0, gate, 0, 0, NULL); 45 46 onecell->hws[BCM2835_AUX_CLOCK_SPI1] = 47 clk_hw_register_gate(dev, "aux_spi1", parent, 0, gate, 1, 0, NULL); 48 49 onecell->hws[BCM2835_AUX_CLOCK_SPI2] = 50 clk_hw_register_gate(dev, "aux_spi2", parent, 0, gate, 2, 0, NULL); 51 52 return of_clk_add_hw_provider(pdev->dev.of_node, of_clk_hw_onecell_get, 53 onecell); 54 } 55 56 static const struct of_device_id bcm2835_aux_clk_of_match[] = { 57 { .compatible = "brcm,bcm2835-aux", }, 58 {}, 59 }; 60 MODULE_DEVICE_TABLE(of, bcm2835_aux_clk_of_match); 61 62 static struct platform_driver bcm2835_aux_clk_driver = { 63 .driver = { 64 .name = "bcm2835-aux-clk", 65 .of_match_table = bcm2835_aux_clk_of_match, 66 }, 67 .probe = bcm2835_aux_clk_probe, 68 }; 69 builtin_platform_driver(bcm2835_aux_clk_driver); 70 71 MODULE_AUTHOR("Eric Anholt <eric@anholt.net>"); 72 MODULE_DESCRIPTION("BCM2835 auxiliary peripheral clock driver"); 73 MODULE_LICENSE("GPL"); 74