[ARM] OMAP3: move USBHOST SAR handling from clock framework to powerdomain layer

Remove usbhost_sar_fclk from the OMAP3 clock framework.  The bit that
the clock was tweaking doesn't actually enable or disable a clock; it
controls whether the hardware will save and restore USBHOST state
when the powerdomain changes state.  (That happens to coincidentally
enable a clock for the duration of the operation, hence the earlier
confusion.)

In place of the clock, mark the USBHOST powerdomain as supporting
hardware save-and-restore functionality.

linux-omap source commit is f3ceac86a9d425d101d606d87a5af44afef27179.

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-omap2/clock34xx.c

@@ -209,7 +209,6 @@ static struct omap_clk omap34xx_clks[] = {
 	CLK(NULL,	"usbhost_120m_fck", &usbhost_120m_fck, CK_3430ES2),
 	CLK(NULL,	"usbhost_48m_fck", &usbhost_48m_fck, CK_3430ES2),
 	CLK(NULL,	"usbhost_ick",	&usbhost_ick,	CK_3430ES2),
-	CLK(NULL,	"usbhost_sar_fck", &usbhost_sar_fck, CK_3430ES2),
 	CLK(NULL,	"usim_fck",	&usim_fck,	CK_3430ES2),
 	CLK(NULL,	"gpt1_fck",	&gpt1_fck,	CK_343X),
 	CLK(NULL,	"wkup_32k_fck",	&wkup_32k_fck,	CK_343X),

arch/arm/mach-omap2/clock34xx.h

@@ -2218,17 +2218,6 @@ static struct clk usbhost_ick = {
 	.recalc		= &followparent_recalc,
 };
 
-static struct clk usbhost_sar_fck = {
-	.name		= "usbhost_sar_fck",
-	.ops		= &clkops_omap2_dflt,
-	.parent		= &osc_sys_ck,
-	.init		= &omap2_init_clk_clkdm,
-	.enable_reg	= OMAP_PRM_REGADDR(OMAP3430ES2_USBHOST_MOD, PM_PWSTCTRL),
-	.enable_bit	= OMAP3430ES2_SAVEANDRESTORE_SHIFT,
-	.clkdm_name	= "usbhost_clkdm",
-	.recalc		= &followparent_recalc,
-};
-
 /* WKUP */
 
 static const struct clksel_rate usim_96m_rates[] = {

arch/arm/mach-omap2/powerdomains34xx.h

@@ -312,6 +312,7 @@ static struct powerdomain usbhost_pwrdm = {
 	.sleepdep_srcs	  = dss_per_usbhost_sleepdeps,
 	.pwrsts		  = PWRSTS_OFF_RET_ON,
 	.pwrsts_logic_ret = PWRDM_POWER_RET,
+	.flags		  = PWRDM_HAS_HDWR_SAR, /* for USBHOST ctrlr only */
 	.banks		  = 1,
 	.pwrsts_mem_ret	  = {
 		[0] = PWRDM_POWER_RET, /* MEMRETSTATE */