LXR linux/drivers/clk/bcm/clk-bcm2835-aux.c

   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
  16static 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        struct resource *res;
  23        void __iomem *reg, *gate;
  24
  25        parent_clk = devm_clk_get(dev, NULL);
  26        if (IS_ERR(parent_clk))
  27                return PTR_ERR(parent_clk);
  28        parent = __clk_get_name(parent_clk);
  29
  30        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  31        reg = devm_ioremap_resource(dev, res);
  32        if (IS_ERR(reg))
  33                return PTR_ERR(reg);
  34
  35        onecell = devm_kmalloc(dev,
  36                               struct_size(onecell, hws,
  37                                           BCM2835_AUX_CLOCK_COUNT),
  38                               GFP_KERNEL);
  39        if (!onecell)
  40                return -ENOMEM;
  41        onecell->num = BCM2835_AUX_CLOCK_COUNT;
  42
  43        gate = reg + BCM2835_AUXENB;
  44        onecell->hws[BCM2835_AUX_CLOCK_UART] =
  45                clk_hw_register_gate(dev, "aux_uart", parent, 0, gate, 0, 0, NULL);
  46
  47        onecell->hws[BCM2835_AUX_CLOCK_SPI1] =
  48                clk_hw_register_gate(dev, "aux_spi1", parent, 0, gate, 1, 0, NULL);
  49
  50        onecell->hws[BCM2835_AUX_CLOCK_SPI2] =
  51                clk_hw_register_gate(dev, "aux_spi2", parent, 0, gate, 2, 0, NULL);
  52
  53        return of_clk_add_hw_provider(pdev->dev.of_node, of_clk_hw_onecell_get,
  54                                      onecell);
  55}
  56
  57static const struct of_device_id bcm2835_aux_clk_of_match[] = {
  58        { .compatible = "brcm,bcm2835-aux", },
  59        {},
  60};
  61MODULE_DEVICE_TABLE(of, bcm2835_aux_clk_of_match);
  62
  63static struct platform_driver bcm2835_aux_clk_driver = {
  64        .driver = {
  65                .name = "bcm2835-aux-clk",
  66                .of_match_table = bcm2835_aux_clk_of_match,
  67        },
  68        .probe          = bcm2835_aux_clk_probe,
  69};
  70builtin_platform_driver(bcm2835_aux_clk_driver);
  71
  72MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
  73MODULE_DESCRIPTION("BCM2835 auxiliary peripheral clock driver");
  74MODULE_LICENSE("GPL");
  75