OMAP2 clock: drop CONFIG_PARTICIPANT clock flag

It turns out that the only purpose of the CONFIG_PARTICIPANT clock
flag is to prevent omap2_clk_set_rate() and omap2_clk_set_parent()
from being executed on clocks with that flag set.  The rate-changing
component can be more directly accomplished by dropping the .set_rate
and .round_rate function pointers from those CONFIG_PARTICIPANT struct
clks.  As far as the parent-changing component is concerned, it turns
out that none of the CONFIG_PARTICIPANT clocks have multiple parent
choices, so all that is necessary is for omap2_clk_set_parent() to
bail out early if the new parent is equal to the old parent.
Implement this change and get rid of the flag, which has always had a
confusing name (it appears to be a Kconfig option, falsely).

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Cc: Richard Woodruff <r-woodruff2@ti.com>

3 files changed, 12 insertions, 36 deletions

diff --git a/arch/arm/mach-omap2/clock.c b/arch/arm/mach-omap2/clock.c
index 3bb3292ec469..9df5937999cb 100644
--- a/arch/arm/mach-omap2/clock.c
+++ b/arch/arm/mach-omap2/clock.c
@@ -318,11 +318,6 @@ int omap2_clk_set_rate(struct clk *clk, unsigned long rate)
 
         pr_debug("clock: set_rate for clock %s to rate %ld\n", clk->name, rate);
 
-        /* CONFIG_PARTICIPANT clocks are changed only in sets via the
-           rate table mechanism, driven by mpu_speed  */
-        if (clk->flags & CONFIG_PARTICIPANT)
-                return -EINVAL;
-
         /* dpll_ck, core_ck, virt_prcm_set; plus all clksel clocks */
         if (clk->set_rate)
                 ret = clk->set_rate(clk, rate);
@@ -332,12 +327,12 @@ int omap2_clk_set_rate(struct clk *clk, unsigned long rate)
 
 int omap2_clk_set_parent(struct clk *clk, struct clk *new_parent)
 {
-        if (clk->flags & CONFIG_PARTICIPANT)
-                return -EINVAL;
-
         if (!clk->clksel)
                 return -EINVAL;
 
+        if (clk->parent == new_parent)
+                return 0;
+
         return omap2_clksel_set_parent(clk, new_parent);
 }
 
diff --git a/arch/arm/mach-omap2/clock2xxx_data.c b/arch/arm/mach-omap2/clock2xxx_data.c
index aa37761fa457..9bcef44fb140 100644
--- a/arch/arm/mach-omap2/clock2xxx_data.c
+++ b/arch/arm/mach-omap2/clock2xxx_data.c
@@ -426,15 +426,13 @@ static struct clk mpu_ck = {	/* Control cpu */
         .name           = "mpu_ck",
         .ops            = &clkops_null,
         .parent         = &core_ck,
-        .flags          = DELAYED_APP | CONFIG_PARTICIPANT,
+        .flags          = DELAYED_APP,
         .clkdm_name     = "mpu_clkdm",
         .init           = &omap2_init_clksel_parent,
         .clksel_reg     = OMAP_CM_REGADDR(MPU_MOD, CM_CLKSEL),
         .clksel_mask    = OMAP24XX_CLKSEL_MPU_MASK,
         .clksel         = mpu_clksel,
         .recalc         = &omap2_clksel_recalc,
-        .round_rate     = &omap2_clksel_round_rate,
-        .set_rate       = &omap2_clksel_set_rate
 };
 
 /*
@@ -468,7 +466,7 @@ static struct clk dsp_fck = {
         .name           = "dsp_fck",
         .ops            = &clkops_omap2_dflt_wait,
         .parent         = &core_ck,
-        .flags          = DELAYED_APP | CONFIG_PARTICIPANT,
+        .flags          = DELAYED_APP,
         .clkdm_name     = "dsp_clkdm",
         .enable_reg     = OMAP_CM_REGADDR(OMAP24XX_DSP_MOD, CM_FCLKEN),
         .enable_bit     = OMAP24XX_CM_FCLKEN_DSP_EN_DSP_SHIFT,
@@ -476,8 +474,6 @@ static struct clk dsp_fck = {
         .clksel_mask    = OMAP24XX_CLKSEL_DSP_MASK,
         .clksel         = dsp_fck_clksel,
         .recalc         = &omap2_clksel_recalc,
-        .round_rate     = &omap2_clksel_round_rate,
-        .set_rate       = &omap2_clksel_set_rate
 };
 
 /* DSP interface clock */
@@ -498,13 +494,11 @@ static struct clk dsp_irate_ick = {
         .name           = "dsp_irate_ick",
         .ops            = &clkops_null,
         .parent         = &dsp_fck,
-        .flags          = DELAYED_APP | CONFIG_PARTICIPANT,
+        .flags          = DELAYED_APP,
         .clksel_reg     = OMAP_CM_REGADDR(OMAP24XX_DSP_MOD, CM_CLKSEL),
         .clksel_mask    = OMAP24XX_CLKSEL_DSP_IF_MASK,
         .clksel         = dsp_irate_ick_clksel,
         .recalc         = &omap2_clksel_recalc,
-        .round_rate     = &omap2_clksel_round_rate,
-        .set_rate             = &omap2_clksel_set_rate
 };
 
 /* 2420 only */
@@ -512,7 +506,6 @@ static struct clk dsp_ick = {
         .name           = "dsp_ick",     /* apparently ipi and isp */
         .ops            = &clkops_omap2_dflt_wait,
         .parent         = &dsp_irate_ick,
-        .flags          = CONFIG_PARTICIPANT,
         .enable_reg     = OMAP_CM_REGADDR(OMAP24XX_DSP_MOD, CM_ICLKEN),
         .enable_bit     = OMAP2420_EN_DSP_IPI_SHIFT,          /* for ipi */
 };
@@ -522,7 +515,6 @@ static struct clk iva2_1_ick = {
         .name           = "iva2_1_ick",
         .ops            = &clkops_omap2_dflt_wait,
         .parent         = &dsp_irate_ick,
-        .flags          = CONFIG_PARTICIPANT,
         .enable_reg     = OMAP_CM_REGADDR(OMAP24XX_DSP_MOD, CM_FCLKEN),
         .enable_bit     = OMAP24XX_CM_FCLKEN_DSP_EN_DSP_SHIFT,
 };
@@ -536,7 +528,7 @@ static struct clk iva1_ifck = {
         .name           = "iva1_ifck",
         .ops            = &clkops_omap2_dflt_wait,
         .parent         = &core_ck,
-        .flags          = CONFIG_PARTICIPANT | DELAYED_APP,
+        .flags          = DELAYED_APP,
         .clkdm_name     = "iva1_clkdm",
         .enable_reg     = OMAP_CM_REGADDR(OMAP24XX_DSP_MOD, CM_FCLKEN),
         .enable_bit     = OMAP2420_EN_IVA_COP_SHIFT,
@@ -544,8 +536,6 @@ static struct clk iva1_ifck = {
         .clksel_mask    = OMAP2420_CLKSEL_IVA_MASK,
         .clksel         = dsp_fck_clksel,
         .recalc         = &omap2_clksel_recalc,
-        .round_rate     = &omap2_clksel_round_rate,
-        .set_rate       = &omap2_clksel_set_rate
 };
 
 /* IVA1 mpu/int/i/f clocks are /2 of parent */
@@ -599,14 +589,12 @@ static struct clk core_l3_ck = {	/* Used for ick and fck, interconnect */
         .name           = "core_l3_ck",
         .ops            = &clkops_null,
         .parent         = &core_ck,
-        .flags          = DELAYED_APP | CONFIG_PARTICIPANT,
+        .flags          = DELAYED_APP,
         .clkdm_name     = "core_l3_clkdm",
         .clksel_reg     = OMAP_CM_REGADDR(CORE_MOD, CM_CLKSEL1),
         .clksel_mask    = OMAP24XX_CLKSEL_L3_MASK,
         .clksel         = core_l3_clksel,
         .recalc         = &omap2_clksel_recalc,
-        .round_rate     = &omap2_clksel_round_rate,
-        .set_rate       = &omap2_clksel_set_rate
 };
 
 /* usb_l4_ick */
@@ -627,7 +615,7 @@ static struct clk usb_l4_ick = {	/* FS-USB interface clock */
         .name           = "usb_l4_ick",
         .ops            = &clkops_omap2_dflt_wait,
         .parent         = &core_l3_ck,
-        .flags          = DELAYED_APP | CONFIG_PARTICIPANT,
+        .flags          = DELAYED_APP,
         .clkdm_name     = "core_l4_clkdm",
         .enable_reg     = OMAP_CM_REGADDR(CORE_MOD, CM_ICLKEN2),
         .enable_bit     = OMAP24XX_EN_USB_SHIFT,
@@ -635,8 +623,6 @@ static struct clk usb_l4_ick = {	/* FS-USB interface clock */
         .clksel_mask    = OMAP24XX_CLKSEL_USB_MASK,
         .clksel         = usb_l4_ick_clksel,
         .recalc         = &omap2_clksel_recalc,
-        .round_rate     = &omap2_clksel_round_rate,
-        .set_rate       = &omap2_clksel_set_rate
 };
 
 /*
@@ -763,7 +749,7 @@ static struct clk gfx_2d_fck = {
         .name           = "gfx_2d_fck",
         .ops            = &clkops_omap2_dflt_wait,
         .parent         = &core_l3_ck,
-        .flags          = DELAYED_APP | CONFIG_PARTICIPANT,
+        .flags          = DELAYED_APP,
         .clkdm_name     = "gfx_clkdm",
         .enable_reg     = OMAP_CM_REGADDR(GFX_MOD, CM_FCLKEN),
         .enable_bit     = OMAP24XX_EN_2D_SHIFT,
@@ -771,15 +757,12 @@ static struct clk gfx_2d_fck = {
         .clksel_mask    = OMAP_CLKSEL_GFX_MASK,
         .clksel         = gfx_fck_clksel,
         .recalc         = &omap2_clksel_recalc,
-        .round_rate     = &omap2_clksel_round_rate,
-        .set_rate       = &omap2_clksel_set_rate
 };
 
 static struct clk gfx_ick = {
         .name           = "gfx_ick",            /* From l3 */
         .ops            = &clkops_omap2_dflt_wait,
         .parent         = &core_l3_ck,
-        .flags          = CONFIG_PARTICIPANT,
         .clkdm_name     = "gfx_clkdm",
         .enable_reg     = OMAP_CM_REGADDR(GFX_MOD, CM_ICLKEN),
         .enable_bit     = OMAP_EN_GFX_SHIFT,
@@ -810,7 +793,7 @@ static struct clk mdm_ick = {		/* used both as a ick and fck */
         .name           = "mdm_ick",
         .ops            = &clkops_omap2_dflt_wait,
         .parent         = &core_ck,
-        .flags          = DELAYED_APP | CONFIG_PARTICIPANT,
+        .flags          = DELAYED_APP,
         .clkdm_name     = "mdm_clkdm",
         .enable_reg     = OMAP_CM_REGADDR(OMAP2430_MDM_MOD, CM_ICLKEN),
         .enable_bit     = OMAP2430_CM_ICLKEN_MDM_EN_MDM_SHIFT,
@@ -818,8 +801,6 @@ static struct clk mdm_ick = {		/* used both as a ick and fck */
         .clksel_mask    = OMAP2430_CLKSEL_MDM_MASK,
         .clksel         = mdm_ick_clksel,
         .recalc         = &omap2_clksel_recalc,
-        .round_rate     = &omap2_clksel_round_rate,
-        .set_rate       = &omap2_clksel_set_rate
 };
 
 static struct clk mdm_osc_ck = {
diff --git a/arch/arm/plat-omap/include/plat/clock.h b/arch/arm/plat-omap/include/plat/clock.h
index 07170c50aa49..70cddc091325 100644
--- a/arch/arm/plat-omap/include/plat/clock.h
+++ b/arch/arm/plat-omap/include/plat/clock.h
@@ -195,7 +195,7 @@ extern const struct clkops clkops_null;
 #define CLOCK_IDLE_CONTROL      (1 << 7)
 #define CLOCK_NO_IDLE_PARENT    (1 << 8)
 #define DELAYED_APP             (1 << 9)        /* Delay application of clock */
-#define CONFIG_PARTICIPANT      (1 << 10)       /* Fundamental clock */
+/* bit 10 is currently free */
 #define ENABLE_ON_INIT          (1 << 11)       /* Enable upon framework init */
 #define INVERT_ENABLE           (1 << 12)       /* 0 enables, 1 disables */
 /* bit 13 is currently free */