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

root/drivers/clk/bcm/clk-bcm2835-aux.c
// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2015 Broadcom
 */

#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/io.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;
        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);

        reg = devm_platform_ioremap_resource(pdev, 0);
        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");
Linux
