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