[ARM] OMAP3 clock: DPLL{1,2}_FCLK clksel can divide by 4

OMAP34xx ES2 TRM Delta G to H states that the divider for DPLL1_FCLK and
DPLL2_FCLK can divide by 4 in addition to dividing by 1 and 2. Encode this
into the OMAP3 clock framework.

linux-omap source commit is 050684c1.
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.h

@@ -1060,8 +1060,15 @@ static struct clk corex2_fck = {
 
 /* DPLL power domain clock controls */
 
-static const struct clksel div2_core_clksel[] = {
-	{ .parent = &core_ck, .rates = div2_rates },
+static const struct clksel_rate div4_rates[] = {
+	{ .div = 1, .val = 1, .flags = RATE_IN_343X | DEFAULT_RATE },
+	{ .div = 2, .val = 2, .flags = RATE_IN_343X },
+	{ .div = 4, .val = 4, .flags = RATE_IN_343X },
+	{ .div = 0 }
+};
+
+static const struct clksel div4_core_clksel[] = {
+	{ .parent = &core_ck, .rates = div4_rates },
 	{ .parent = NULL }
 };
 
@@ -1076,7 +1083,7 @@ static struct clk dpll1_fck = {
 	.init		= &omap2_init_clksel_parent,
 	.clksel_reg	= OMAP_CM_REGADDR(MPU_MOD, OMAP3430_CM_CLKSEL1_PLL),
 	.clksel_mask	= OMAP3430_MPU_CLK_SRC_MASK,
-	.clksel		= div2_core_clksel,
+	.clksel		= div4_core_clksel,
 	.flags		= RATE_PROPAGATES,
 	.recalc		= &omap2_clksel_recalc,
 };
@@ -1151,7 +1158,7 @@ static struct clk dpll2_fck = {
 	.init		= &omap2_init_clksel_parent,
 	.clksel_reg	= OMAP_CM_REGADDR(OMAP3430_IVA2_MOD, OMAP3430_CM_CLKSEL1_PLL),
 	.clksel_mask	= OMAP3430_IVA2_CLK_SRC_MASK,
-	.clksel		= div2_core_clksel,
+	.clksel		= div4_core_clksel,
 	.flags		= RATE_PROPAGATES,
 	.recalc		= &omap2_clksel_recalc,
 };
@@ -1187,6 +1194,11 @@ static struct clk iva2_ck = {
 
 /* Common interface clocks */
 
+static const struct clksel div2_core_clksel[] = {
+	{ .parent = &core_ck, .rates = div2_rates },
+	{ .parent = NULL }
+};
+
 static struct clk l3_ick = {
 	.name		= "l3_ick",
 	.ops		= &clkops_null,