diff options
Diffstat (limited to 'drivers/clk/bcm/clk-bcm2835-aux.c')
| -rw-r--r-- | drivers/clk/bcm/clk-bcm2835-aux.c | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/drivers/clk/bcm/clk-bcm2835-aux.c b/drivers/clk/bcm/clk-bcm2835-aux.c new file mode 100644 index 000000000..f225ad29b --- /dev/null +++ b/drivers/clk/bcm/clk-bcm2835-aux.c @@ -0,0 +1,82 @@ +/* + * Copyright (C) 2015 Broadcom + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/clk.h> +#include <linux/clk-provider.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <dt-bindings/clock/bcm2835-aux.h> + +#define BCM2835_AUXIRQ 0x00 +#define BCM2835_AUXENB 0x04 + +static int bcm2835_aux_clk_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct clk_hw_onecell_data *onecell; + const char *parent; + struct clk *parent_clk; + struct resource *res; + void __iomem *reg, *gate; + + parent_clk = devm_clk_get(dev, NULL); + if (IS_ERR(parent_clk)) + return PTR_ERR(parent_clk); + parent = __clk_get_name(parent_clk); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + reg = devm_ioremap_resource(dev, res); + if (IS_ERR(reg)) + return PTR_ERR(reg); + + onecell = devm_kmalloc(dev, + struct_size(onecell, hws, + BCM2835_AUX_CLOCK_COUNT), + GFP_KERNEL); + if (!onecell) + return -ENOMEM; + onecell->num = BCM2835_AUX_CLOCK_COUNT; + + gate = reg + BCM2835_AUXENB; + onecell->hws[BCM2835_AUX_CLOCK_UART] = + clk_hw_register_gate(dev, "aux_uart", parent, 0, gate, 0, 0, NULL); + + onecell->hws[BCM2835_AUX_CLOCK_SPI1] = + clk_hw_register_gate(dev, "aux_spi1", parent, 0, gate, 1, 0, NULL); + + onecell->hws[BCM2835_AUX_CLOCK_SPI2] = + clk_hw_register_gate(dev, "aux_spi2", parent, 0, gate, 2, 0, NULL); + + return of_clk_add_hw_provider(pdev->dev.of_node, of_clk_hw_onecell_get, + onecell); +} + +static const struct of_device_id bcm2835_aux_clk_of_match[] = { + { .compatible = "brcm,bcm2835-aux", }, + {}, +}; +MODULE_DEVICE_TABLE(of, bcm2835_aux_clk_of_match); + +static struct platform_driver bcm2835_aux_clk_driver = { + .driver = { + .name = "bcm2835-aux-clk", + .of_match_table = bcm2835_aux_clk_of_match, + }, + .probe = bcm2835_aux_clk_probe, +}; +builtin_platform_driver(bcm2835_aux_clk_driver); + +MODULE_AUTHOR("Eric Anholt <eric@anholt.net>"); +MODULE_DESCRIPTION("BCM2835 auxiliary peripheral clock driver"); +MODULE_LICENSE("GPL v2"); |