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ARM: rpi: register a clkdev for the eMMC clock 

Use the mailbox driver to query the clock frequency and create
a clkdev for the bcm2835_mci driver.

Signed-off-by: Andre Heider <a.heider@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Andre Heider 2013-10-19 14:20:53 +02:00 committed by Sascha Hauer
parent 76cb4002af
commit a476255682
1 changed files with 40 additions and 0 deletions
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40
arch/arm/boards/raspberry-pi/rpi.c
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@ -17,11 +17,44 @@
#include <init.h>
#include <fs.h>
#include <linux/stat.h>
#include <linux/clk.h>
#include <linux/clkdev.h>
#include <envfs.h>
#include <asm/armlinux.h>
#include <generated/mach-types.h>
#include <mach/core.h>
#include <mach/mbox.h>
struct msg_get_clock_rate {
struct bcm2835_mbox_hdr hdr;
struct bcm2835_mbox_tag_get_clock_rate get_clock_rate;
u32 end_tag;
};
static int rpi_register_clkdev(u32 clock_id, const char *name)
{
BCM2835_MBOX_STACK_ALIGN(struct msg_get_clock_rate, msg);
struct clk *clk;
int ret;
BCM2835_MBOX_INIT_HDR(msg);
BCM2835_MBOX_INIT_TAG(&msg->get_clock_rate, GET_CLOCK_RATE);
msg->get_clock_rate.body.req.clock_id = clock_id;
ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg->hdr);
if (ret)
return ret;
clk = clk_fixed(name, msg->get_clock_rate.body.resp.rate_hz);
if (IS_ERR(clk))
return PTR_ERR(clk);
if (!clk_register_clkdev(clk, NULL, name))
return -ENODEV;
return 0;
}
static int rpi_mem_init(void)
{
@ -40,6 +73,13 @@ static int rpi_console_init(void)
}
console_initcall(rpi_console_init);
static int rpi_clock_init(void)
{
rpi_register_clkdev(BCM2835_MBOX_CLOCK_ID_EMMC, "bcm2835_mci0");
return 0;
}
postconsole_initcall(rpi_clock_init);
static int rpi_env_init(void)
{
struct stat s;