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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: Eric Anholt <eric@anholt.net>
Signed-off-by: Michael Turquette <mturquette@baylibre.com>
This commit is contained in:
Eric Anholt 2015-12-15 15:35:58 -08:00 committed by Michael Turquette
parent 9f697864b3
commit 5e63dcc74b
2 changed files with 86 additions and 0 deletions
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1
drivers/clk/bcm/Makefile
View File

@ -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

85
drivers/clk/bcm/clk-bcm2835-aux.c Normal file
View File

@ -0,0 +1,85 @@
/*
* 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");