75fabc3f64
This patch adds a minimal stub clock driver for the BCM2835. Its sole purpose is to allow the PL011 AMBA clk_get() API calls to provide something that looks enough like a clock that the driver probes and operates correctly. This patch was extracted from git://github.com/lp0/linux.git branch rpi-split as of 2012/09/08, and modified as follows: * Reworked to call clk_register_fixed_rate(), and clk_register_clkdev() rather than using static data to represent the clocks. * Moved implementation to drivers/clk/. * Modified .dev_id for UART clocks to match UART DT node names. * s/bcm2708/bcm2835/. * Modified device tree vendor prefix. Signed-off-by: Chris Boot <bootc@bootc.net> Signed-off-by: Simon Arlott <simon@fire.lp0.eu> Signed-off-by: Dom Cobley <popcornmix@gmail.com> Signed-off-by: Dom Cobley <dc4@broadcom.com> Signed-off-by: Stephen Warren <swarren@wwwdotorg.org> Acked-by: Mike Turquette <mturquette@linaro.org>
60 lines
1.9 KiB
C
60 lines
1.9 KiB
C
/*
|
|
* Copyright (C) 2010 Broadcom
|
|
* Copyright (C) 2012 Stephen Warren
|
|
*
|
|
* 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.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#include <linux/clk-provider.h>
|
|
#include <linux/clkdev.h>
|
|
#include <linux/clk/bcm2835.h>
|
|
|
|
/*
|
|
* These are fixed clocks. They're probably not all root clocks and it may
|
|
* be possible to turn them on and off but until this is mapped out better
|
|
* it's the only way they can be used.
|
|
*/
|
|
void __init bcm2835_init_clocks(void)
|
|
{
|
|
struct clk *clk;
|
|
int ret;
|
|
|
|
clk = clk_register_fixed_rate(NULL, "sys_pclk", NULL, CLK_IS_ROOT,
|
|
250000000);
|
|
if (!clk)
|
|
pr_err("sys_pclk not registered\n");
|
|
|
|
clk = clk_register_fixed_rate(NULL, "apb_pclk", NULL, CLK_IS_ROOT,
|
|
126000000);
|
|
if (!clk)
|
|
pr_err("apb_pclk not registered\n");
|
|
|
|
clk = clk_register_fixed_rate(NULL, "uart0_pclk", NULL, CLK_IS_ROOT,
|
|
3000000);
|
|
if (!clk)
|
|
pr_err("uart0_pclk not registered\n");
|
|
ret = clk_register_clkdev(clk, NULL, "20201000.uart");
|
|
if (ret)
|
|
pr_err("uart0_pclk alias not registered\n");
|
|
|
|
clk = clk_register_fixed_rate(NULL, "uart1_pclk", NULL, CLK_IS_ROOT,
|
|
125000000);
|
|
if (!clk)
|
|
pr_err("uart1_pclk not registered\n");
|
|
ret = clk_register_clkdev(clk, NULL, "20215000.uart");
|
|
if (ret)
|
|
pr_err("uart0_pclk alias not registered\n");
|
|
}
|