[ARM] omap: create a proper tree of clocks

Traditionally, we've tracked the parent/child relationships between
clk structures by setting the child's parent member to point at the
upstream clock.  As a result, when decending the tree, we have had
to scan all clocks to find the children.

Avoid this wasteful scanning by keeping a list of the clock's children.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 9 insertions, 19 deletions

diff --git a/arch/arm/mach-omap2/clock24xx.h b/arch/arm/mach-omap2/clock24xx.h
index 7731ab6acd18..759489822ee9 100644
--- a/arch/arm/mach-omap2/clock24xx.h
+++ b/arch/arm/mach-omap2/clock24xx.h
@@ -621,7 +621,7 @@ static struct clk func_32k_ck = {
         .name           = "func_32k_ck",
         .ops            = &clkops_null,
         .rate           = 32000,
-        .flags          = RATE_FIXED | RATE_PROPAGATES,
+        .flags          = RATE_FIXED,
         .clkdm_name     = "wkup_clkdm",
 };
 
@@ -629,7 +629,6 @@ static struct clk func_32k_ck = {
 static struct clk osc_ck = {            /* (*12, *13, 19.2, *26, 38.4)MHz */
         .name           = "osc_ck",
         .ops            = &clkops_oscck,
-        .flags          = RATE_PROPAGATES,
         .clkdm_name     = "wkup_clkdm",
         .recalc         = &omap2_osc_clk_recalc,
 };
@@ -639,7 +638,6 @@ static struct clk sys_ck = {		/* (*12, *13, 19.2, 26, 38.4)MHz */
         .name           = "sys_ck",             /* ~ ref_clk also */
         .ops            = &clkops_null,
         .parent         = &osc_ck,
-        .flags          = RATE_PROPAGATES,
         .clkdm_name     = "wkup_clkdm",
         .recalc         = &omap2_sys_clk_recalc,
 };
@@ -648,7 +646,7 @@ static struct clk alt_ck = {		/* Typical 54M or 48M, may not exist */
         .name           = "alt_ck",
         .ops            = &clkops_null,
         .rate           = 54000000,
-        .flags          = RATE_FIXED | RATE_PROPAGATES,
+        .flags          = RATE_FIXED,
         .clkdm_name     = "wkup_clkdm",
 };
 
@@ -680,7 +678,6 @@ static struct clk dpll_ck = {
         .ops            = &clkops_null,
         .parent         = &sys_ck,              /* Can be func_32k also */
         .dpll_data      = &dpll_dd,
-        .flags          = RATE_PROPAGATES,
         .clkdm_name     = "wkup_clkdm",
         .recalc         = &omap2_dpllcore_recalc,
         .set_rate       = &omap2_reprogram_dpllcore,
@@ -691,7 +688,7 @@ static struct clk apll96_ck = {
         .ops            = &clkops_fixed,
         .parent         = &sys_ck,
         .rate           = 96000000,
-        .flags          = RATE_FIXED | RATE_PROPAGATES | ENABLE_ON_INIT,
+        .flags          = RATE_FIXED | ENABLE_ON_INIT,
         .clkdm_name     = "wkup_clkdm",
         .enable_reg     = OMAP_CM_REGADDR(PLL_MOD, CM_CLKEN),
         .enable_bit     = OMAP24XX_EN_96M_PLL_SHIFT,
@@ -702,7 +699,7 @@ static struct clk apll54_ck = {
         .ops            = &clkops_fixed,
         .parent         = &sys_ck,
         .rate           = 54000000,
-        .flags          = RATE_FIXED | RATE_PROPAGATES | ENABLE_ON_INIT,
+        .flags          = RATE_FIXED | ENABLE_ON_INIT,
         .clkdm_name     = "wkup_clkdm",
         .enable_reg     = OMAP_CM_REGADDR(PLL_MOD, CM_CLKEN),
         .enable_bit     = OMAP24XX_EN_54M_PLL_SHIFT,
@@ -734,7 +731,6 @@ static struct clk func_54m_ck = {
         .name           = "func_54m_ck",
         .ops            = &clkops_null,
         .parent         = &apll54_ck,   /* can also be alt_clk */
-        .flags          = RATE_PROPAGATES,
         .clkdm_name     = "wkup_clkdm",
         .init           = &omap2_init_clksel_parent,
         .clksel_reg     = OMAP_CM_REGADDR(PLL_MOD, CM_CLKSEL1),
@@ -747,7 +743,6 @@ static struct clk core_ck = {
         .name           = "core_ck",
         .ops            = &clkops_null,
         .parent         = &dpll_ck,             /* can also be 32k */
-        .flags          = RATE_PROPAGATES,
         .clkdm_name     = "wkup_clkdm",
         .recalc         = &followparent_recalc,
 };
@@ -774,7 +769,6 @@ static struct clk func_96m_ck = {
         .name           = "func_96m_ck",
         .ops            = &clkops_null,
         .parent         = &apll96_ck,
-        .flags          = RATE_PROPAGATES,
         .clkdm_name     = "wkup_clkdm",
         .init           = &omap2_init_clksel_parent,
         .clksel_reg     = OMAP_CM_REGADDR(PLL_MOD, CM_CLKSEL1),
@@ -807,7 +801,6 @@ static struct clk func_48m_ck = {
         .name           = "func_48m_ck",
         .ops            = &clkops_null,
         .parent         = &apll96_ck,    /* 96M or Alt */
-        .flags          = RATE_PROPAGATES,
         .clkdm_name     = "wkup_clkdm",
         .init           = &omap2_init_clksel_parent,
         .clksel_reg     = OMAP_CM_REGADDR(PLL_MOD, CM_CLKSEL1),
@@ -823,7 +816,6 @@ static struct clk func_12m_ck = {
         .ops            = &clkops_null,
         .parent         = &func_48m_ck,
         .fixed_div      = 4,
-        .flags          = RATE_PROPAGATES,
         .clkdm_name     = "wkup_clkdm",
         .recalc         = &omap2_fixed_divisor_recalc,
 };
@@ -876,7 +868,6 @@ static struct clk sys_clkout_src = {
         .name           = "sys_clkout_src",
         .ops            = &clkops_omap2_dflt,
         .parent         = &func_54m_ck,
-        .flags          = RATE_PROPAGATES,
         .clkdm_name     = "wkup_clkdm",
         .enable_reg     = OMAP24XX_PRCM_CLKOUT_CTRL,
         .enable_bit     = OMAP24XX_CLKOUT_EN_SHIFT,
@@ -921,7 +912,6 @@ static struct clk sys_clkout2_src = {
         .name           = "sys_clkout2_src",
         .ops            = &clkops_omap2_dflt,
         .parent         = &func_54m_ck,
-        .flags          = RATE_PROPAGATES,
         .clkdm_name     = "wkup_clkdm",
         .enable_reg     = OMAP24XX_PRCM_CLKOUT_CTRL,
         .enable_bit     = OMAP2420_CLKOUT2_EN_SHIFT,
@@ -992,7 +982,7 @@ static struct clk mpu_ck = {	/* Control cpu */
         .name           = "mpu_ck",
         .ops            = &clkops_null,
         .parent         = &core_ck,
-        .flags          = DELAYED_APP | CONFIG_PARTICIPANT | RATE_PROPAGATES,
+        .flags          = DELAYED_APP | CONFIG_PARTICIPANT,
         .clkdm_name     = "mpu_clkdm",
         .init           = &omap2_init_clksel_parent,
         .clksel_reg     = OMAP_CM_REGADDR(MPU_MOD, CM_CLKSEL),
@@ -1034,7 +1024,7 @@ static struct clk dsp_fck = {
         .name           = "dsp_fck",
         .ops            = &clkops_omap2_dflt_wait,
         .parent         = &core_ck,
-        .flags          = DELAYED_APP | CONFIG_PARTICIPANT | RATE_PROPAGATES,
+        .flags          = DELAYED_APP | CONFIG_PARTICIPANT,
         .clkdm_name     = "dsp_clkdm",
         .enable_reg     = OMAP_CM_REGADDR(OMAP24XX_DSP_MOD, CM_FCLKEN),
         .enable_bit     = OMAP24XX_CM_FCLKEN_DSP_EN_DSP_SHIFT,
@@ -1102,7 +1092,7 @@ static struct clk iva1_ifck = {
         .name           = "iva1_ifck",
         .ops            = &clkops_omap2_dflt_wait,
         .parent         = &core_ck,
-        .flags          = CONFIG_PARTICIPANT | RATE_PROPAGATES | DELAYED_APP,
+        .flags          = CONFIG_PARTICIPANT | DELAYED_APP,
         .clkdm_name     = "iva1_clkdm",
         .enable_reg     = OMAP_CM_REGADDR(OMAP24XX_DSP_MOD, CM_FCLKEN),
         .enable_bit     = OMAP2420_EN_IVA_COP_SHIFT,
@@ -1165,7 +1155,7 @@ 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 | RATE_PROPAGATES,
+        .flags          = DELAYED_APP | CONFIG_PARTICIPANT,
         .clkdm_name     = "core_l3_clkdm",
         .clksel_reg     = OMAP_CM_REGADDR(CORE_MOD, CM_CLKSEL1),
         .clksel_mask    = OMAP24XX_CLKSEL_L3_MASK,
@@ -1227,7 +1217,7 @@ static struct clk l4_ck = {		/* used both as an ick and fck */
         .name           = "l4_ck",
         .ops            = &clkops_null,
         .parent         = &core_l3_ck,
-        .flags          = DELAYED_APP | RATE_PROPAGATES,
+        .flags          = DELAYED_APP,
         .clkdm_name     = "core_l4_clkdm",
         .clksel_reg     = OMAP_CM_REGADDR(CORE_MOD, CM_CLKSEL1),
         .clksel_mask    = OMAP24XX_CLKSEL_L4_MASK,