Commit ab0a2b9b authored by Juha Yrjola's avatar Juha Yrjola Committed by Tony Lindgren
Browse files

ARM: OMAP: Add support for forcing osc_ck on 



Some boards might use the oscillator clock for powering
external peripherals. Add support for making sure osc_ck
stays active even when trying to go to sleep.

Signed-off-by: default avatarJuha Yrjola <juha.yrjola@solidboot.com>
Signed-off-by: default avatarTony Lindgren <tony@atomide.com>
parent 12583a70

arch/arm/mach-omap2/clock.c

+18 −0
Original line number Diff line number Diff line
@@ -81,6 +81,14 @@ static void omap2_propagate_rate(struct clk * clk) 
	propagate_rate(clk);

}



static void omap2_set_osc_ck(int enable)

{

	if (enable)

		PRCM_CLKSRC_CTRL &= ~(0x3 << 3);

	else

		PRCM_CLKSRC_CTRL |= 0x3 << 3;

}



/* Enable an APLL if off */

static void omap2_clk_fixed_enable(struct clk *clk)

{
@@ -121,6 +129,11 @@ static int _omap2_clk_enable(struct clk * clk) 
	if (clk->flags & ALWAYS_ENABLED)

		return 0;



	if (unlikely(clk == &osc_ck)) {

		omap2_set_osc_ck(1);

		return 0;

	}



	if (unlikely(clk->enable_reg == 0)) {

		printk(KERN_ERR "clock.c: Enable for %s without enable code\n",

		       clk->name);
@@ -158,6 +171,11 @@ static void _omap2_clk_disable(struct clk *clk) 
{

	u32 regval32;



	if (unlikely(clk == &osc_ck)) {

		omap2_set_osc_ck(0);

		return;

	}



	if (clk->enable_reg == 0)

		return;

arch/arm/mach-omap2/clock.h

+1 −1
Original line number Diff line number Diff line
@@ -560,7 +560,7 @@ static struct clk osc_ck = { /* (*12, *13, 19.2, *26, 38.4)MHz */ 
	.name		= "osc_ck",

	.rate		= 26000000,		/* fixed up in clock init */

	.flags		= CLOCK_IN_OMAP242X | CLOCK_IN_OMAP243X |

				RATE_FIXED | ALWAYS_ENABLED | RATE_PROPAGATES,

				RATE_FIXED | RATE_PROPAGATES,

};



/* With out modem likely 12MHz, with modem likely 13MHz */