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Commit 5e63dcc7 authored by Eric Anholt's avatar Eric Anholt Committed by Michael Turquette
Browse files

clk: bcm2835: Add a driver for the auxiliary peripheral clock gates. 



There are a pair of SPI masters and a mini UART that were last minute
additions.  As a result, they didn't get integrated in the same way as
the other gates off of the VPU clock in CPRMAN.

Signed-off-by: default avatarEric Anholt <eric@anholt.net>
Signed-off-by: default avatarMichael Turquette <mturquette@baylibre.com>
parent 9f697864

drivers/clk/bcm/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -4,6 +4,7 @@ obj-$(CONFIG_CLK_BCM_KONA) += clk-bcm281xx.o 
obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm21664.o

obj-$(CONFIG_COMMON_CLK_IPROC)	+= clk-iproc-armpll.o clk-iproc-pll.o clk-iproc-asiu.o

obj-$(CONFIG_ARCH_BCM2835)	+= clk-bcm2835.o

obj-$(CONFIG_ARCH_BCM2835)	+= clk-bcm2835-aux.o

obj-$(CONFIG_COMMON_CLK_IPROC)	+= clk-ns2.o

obj-$(CONFIG_ARCH_BCM_CYGNUS)	+= clk-cygnus.o

obj-$(CONFIG_ARCH_BCM_NSP)	+= clk-nsp.o

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

0 → 100644
+85 −0
Original line number Diff line number Diff line 
/*

 * 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/clk/bcm2835.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_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 (!reg)

		return -ENODEV;



	onecell = devm_kmalloc(dev, sizeof(*onecell), GFP_KERNEL);

	if (!onecell)

		return -ENOMEM;

	onecell->clk_num = BCM2835_AUX_CLOCK_COUNT;

	onecell->clks = devm_kcalloc(dev, BCM2835_AUX_CLOCK_COUNT,

				     sizeof(*onecell->clks), GFP_KERNEL);

	if (!onecell->clks)

		return -ENOMEM;



	gate = reg + BCM2835_AUXENB;

	onecell->clks[BCM2835_AUX_CLOCK_UART] =

		clk_register_gate(dev, "aux_uart", parent, 0, gate, 0, 0, NULL);



	onecell->clks[BCM2835_AUX_CLOCK_SPI1] =

		clk_register_gate(dev, "aux_spi1", parent, 0, gate, 1, 0, NULL);



	onecell->clks[BCM2835_AUX_CLOCK_SPI2] =

		clk_register_gate(dev, "aux_spi2", parent, 0, gate, 2, 0, NULL);



	of_clk_add_provider(pdev->dev.of_node, of_clk_src_onecell_get, onecell);



	return 0;

}



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");