[ARM] OMAP2/3 clockdomains: combine pwrdm, pwrdm_name into union in struct clockdomain

struct clockdomain contains a struct powerdomain *pwrdm and const char
*pwrdm_name.  The pwrdm_name is only used at initialization to look up
the appropriate pwrdm pointer.  Combining these into a union saves
about 100 bytes on 3430SDP.  This patch should not cause any change in
kernel function.

Updated to gracefully handle autodeps that contain invalid powerdomains,
per Russell King's review comments.

Boot-tested on BeagleBoard ES2.1.

linux-omap source commit is 718fc6cd4db902aa2242a736cc3feb8744a4c71a.

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>

3 files changed, 72 insertions, 65 deletions

diff --git a/arch/arm/mach-omap2/clockdomain.c b/arch/arm/mach-omap2/clockdomain.c
index 4c3ce9cfd948..e9b4f6c564e4 100644
--- a/arch/arm/mach-omap2/clockdomain.c
+++ b/arch/arm/mach-omap2/clockdomain.c
@@ -22,6 +22,7 @@
 #include <linux/delay.h>
 #include <linux/clk.h>
 #include <linux/limits.h>
+#include <linux/err.h>
 
 #include <linux/io.h>
 
@@ -71,14 +72,14 @@ static void _autodep_lookup(struct clkdm_pwrdm_autodep *autodep)
         if (!omap_chip_is(autodep->omap_chip))
                 return;
 
-        pwrdm = pwrdm_lookup(autodep->pwrdm_name);
+        pwrdm = pwrdm_lookup(autodep->pwrdm.name);
         if (!pwrdm) {
                 pr_debug("clockdomain: _autodep_lookup: powerdomain %s "
-                         "does not exist\n", autodep->pwrdm_name);
+                         "does not exist\n", autodep->pwrdm.name);
                 WARN_ON(1);
-                return;
+                pwrdm = ERR_PTR(-ENOENT);
         }
-        autodep->pwrdm = pwrdm;
+        autodep->pwrdm.ptr = pwrdm;
 
         return;
 }
@@ -95,16 +96,16 @@ static void _clkdm_add_autodeps(struct clockdomain *clkdm)
 {
         struct clkdm_pwrdm_autodep *autodep;
 
-        for (autodep = autodeps; autodep->pwrdm_name; autodep++) {
-                if (!autodep->pwrdm)
+        for (autodep = autodeps; autodep->pwrdm.ptr; autodep++) {
+                if (IS_ERR(autodep->pwrdm.ptr))
                         continue;
 
                 pr_debug("clockdomain: adding %s sleepdep/wkdep for "
-                         "pwrdm %s\n", autodep->pwrdm_name,
-                         clkdm->pwrdm->name);
+                         "pwrdm %s\n", autodep->pwrdm.ptr->name,
+                         clkdm->pwrdm.ptr->name);
 
-                pwrdm_add_sleepdep(clkdm->pwrdm, autodep->pwrdm);
-                pwrdm_add_wkdep(clkdm->pwrdm, autodep->pwrdm);
+                pwrdm_add_sleepdep(clkdm->pwrdm.ptr, autodep->pwrdm.ptr);
+                pwrdm_add_wkdep(clkdm->pwrdm.ptr, autodep->pwrdm.ptr);
         }
 }
 
@@ -120,16 +121,16 @@ static void _clkdm_del_autodeps(struct clockdomain *clkdm)
 {
         struct clkdm_pwrdm_autodep *autodep;
 
-        for (autodep = autodeps; autodep->pwrdm_name; autodep++) {
-                if (!autodep->pwrdm)
+        for (autodep = autodeps; autodep->pwrdm.ptr; autodep++) {
+                if (IS_ERR(autodep->pwrdm.ptr))
                         continue;
 
                 pr_debug("clockdomain: removing %s sleepdep/wkdep for "
-                         "pwrdm %s\n", autodep->pwrdm_name,
-                         clkdm->pwrdm->name);
+                         "pwrdm %s\n", autodep->pwrdm.ptr->name,
+                         clkdm->pwrdm.ptr->name);
 
-                pwrdm_del_sleepdep(clkdm->pwrdm, autodep->pwrdm);
-                pwrdm_del_wkdep(clkdm->pwrdm, autodep->pwrdm);
+                pwrdm_del_sleepdep(clkdm->pwrdm.ptr, autodep->pwrdm.ptr);
+                pwrdm_del_wkdep(clkdm->pwrdm.ptr, autodep->pwrdm.ptr);
         }
 }
 
@@ -179,7 +180,7 @@ void clkdm_init(struct clockdomain **clkdms,
 
         autodeps = init_autodeps;
         if (autodeps)
-                for (autodep = autodeps; autodep->pwrdm_name; autodep++)
+                for (autodep = autodeps; autodep->pwrdm.ptr; autodep++)
                         _autodep_lookup(autodep);
 }
 
@@ -202,13 +203,13 @@ int clkdm_register(struct clockdomain *clkdm)
         if (!omap_chip_is(clkdm->omap_chip))
                 return -EINVAL;
 
-        pwrdm = pwrdm_lookup(clkdm->pwrdm_name);
+        pwrdm = pwrdm_lookup(clkdm->pwrdm.name);
         if (!pwrdm) {
                 pr_debug("clockdomain: clkdm_register %s: powerdomain %s "
-                         "does not exist\n", clkdm->name, clkdm->pwrdm_name);
+                         "does not exist\n", clkdm->name, clkdm->pwrdm.name);
                 return -EINVAL;
         }
-        clkdm->pwrdm = pwrdm;
+        clkdm->pwrdm.ptr = pwrdm;
 
         mutex_lock(&clkdm_mutex);
         /* Verify that the clockdomain is not already registered */
@@ -242,7 +243,7 @@ int clkdm_unregister(struct clockdomain *clkdm)
         if (!clkdm)
                 return -EINVAL;
 
-        pwrdm_del_clkdm(clkdm->pwrdm, clkdm);
+        pwrdm_del_clkdm(clkdm->pwrdm.ptr, clkdm);
 
         mutex_lock(&clkdm_mutex);
         list_del(&clkdm->node);
@@ -327,7 +328,7 @@ struct powerdomain *clkdm_get_pwrdm(struct clockdomain *clkdm)
         if (!clkdm)
                 return NULL;
 
-        return clkdm->pwrdm;
+        return clkdm->pwrdm.ptr;
 }
 
 
@@ -348,7 +349,7 @@ static int omap2_clkdm_clktrctrl_read(struct clockdomain *clkdm)
         if (!clkdm)
                 return -EINVAL;
 
-        v = cm_read_mod_reg(clkdm->pwrdm->prcm_offs, CM_CLKSTCTRL);
+        v = cm_read_mod_reg(clkdm->pwrdm.ptr->prcm_offs, CM_CLKSTCTRL);
         v &= clkdm->clktrctrl_mask;
         v >>= __ffs(clkdm->clktrctrl_mask);
 
@@ -380,7 +381,7 @@ int omap2_clkdm_sleep(struct clockdomain *clkdm)
         if (cpu_is_omap24xx()) {
 
                 cm_set_mod_reg_bits(OMAP24XX_FORCESTATE,
-                                    clkdm->pwrdm->prcm_offs, PM_PWSTCTRL);
+                                    clkdm->pwrdm.ptr->prcm_offs, PM_PWSTCTRL);
 
         } else if (cpu_is_omap34xx()) {
 
@@ -388,7 +389,7 @@ int omap2_clkdm_sleep(struct clockdomain *clkdm)
                          __ffs(clkdm->clktrctrl_mask));
 
                 cm_rmw_mod_reg_bits(clkdm->clktrctrl_mask, v,
-                                    clkdm->pwrdm->prcm_offs, CM_CLKSTCTRL);
+                                    clkdm->pwrdm.ptr->prcm_offs, CM_CLKSTCTRL);
 
         } else {
                 BUG();
@@ -422,7 +423,7 @@ int omap2_clkdm_wakeup(struct clockdomain *clkdm)
         if (cpu_is_omap24xx()) {
 
                 cm_clear_mod_reg_bits(OMAP24XX_FORCESTATE,
-                                      clkdm->pwrdm->prcm_offs, PM_PWSTCTRL);
+                                      clkdm->pwrdm.ptr->prcm_offs, PM_PWSTCTRL);
 
         } else if (cpu_is_omap34xx()) {
 
@@ -430,7 +431,7 @@ int omap2_clkdm_wakeup(struct clockdomain *clkdm)
                          __ffs(clkdm->clktrctrl_mask));
 
                 cm_rmw_mod_reg_bits(clkdm->clktrctrl_mask, v,
-                                    clkdm->pwrdm->prcm_offs, CM_CLKSTCTRL);
+                                    clkdm->pwrdm.ptr->prcm_offs, CM_CLKSTCTRL);
 
         } else {
                 BUG();
@@ -478,7 +479,7 @@ void omap2_clkdm_allow_idle(struct clockdomain *clkdm)
 
         cm_rmw_mod_reg_bits(clkdm->clktrctrl_mask,
                             v << __ffs(clkdm->clktrctrl_mask),
-                            clkdm->pwrdm->prcm_offs,
+                            clkdm->pwrdm.ptr->prcm_offs,
                             CM_CLKSTCTRL);
 }
 
@@ -516,7 +517,7 @@ void omap2_clkdm_deny_idle(struct clockdomain *clkdm)
 
         cm_rmw_mod_reg_bits(clkdm->clktrctrl_mask,
                             v << __ffs(clkdm->clktrctrl_mask),
-                            clkdm->pwrdm->prcm_offs, CM_CLKSTCTRL);
+                            clkdm->pwrdm.ptr->prcm_offs, CM_CLKSTCTRL);
 
         if (atomic_read(&clkdm->usecount) > 0)
                 _clkdm_del_autodeps(clkdm);
diff --git a/arch/arm/mach-omap2/clockdomains.h b/arch/arm/mach-omap2/clockdomains.h
index cd86dcc7b424..e17c3693542c 100644
--- a/arch/arm/mach-omap2/clockdomains.h
+++ b/arch/arm/mach-omap2/clockdomains.h
@@ -19,7 +19,7 @@
 /* This is an implicit clockdomain - it is never defined as such in TRM */
 static struct clockdomain wkup_clkdm = {
         .name           = "wkup_clkdm",
-        .pwrdm_name     = "wkup_pwrdm",
+        .pwrdm          = { .name = "wkup_pwrdm" },
         .omap_chip      = OMAP_CHIP_INIT(CHIP_IS_OMAP24XX | CHIP_IS_OMAP3430),
 };
 
@@ -31,7 +31,7 @@ static struct clockdomain wkup_clkdm = {
 
 static struct clockdomain mpu_2420_clkdm = {
         .name           = "mpu_clkdm",
-        .pwrdm_name     = "mpu_pwrdm",
+        .pwrdm          = { .name = "mpu_pwrdm" },
         .flags          = CLKDM_CAN_HWSUP,
         .clktrctrl_mask = OMAP24XX_AUTOSTATE_MPU_MASK,
         .omap_chip      = OMAP_CHIP_INIT(CHIP_IS_OMAP2420),
@@ -39,7 +39,7 @@ static struct clockdomain mpu_2420_clkdm = {
 
 static struct clockdomain iva1_2420_clkdm = {
         .name           = "iva1_clkdm",
-        .pwrdm_name     = "dsp_pwrdm",
+        .pwrdm          = { .name = "dsp_pwrdm" },
         .flags          = CLKDM_CAN_HWSUP_SWSUP,
         .clktrctrl_mask = OMAP2420_AUTOSTATE_IVA_MASK,
         .omap_chip      = OMAP_CHIP_INIT(CHIP_IS_OMAP2420),
@@ -56,7 +56,7 @@ static struct clockdomain iva1_2420_clkdm = {
 
 static struct clockdomain mpu_2430_clkdm = {
         .name           = "mpu_clkdm",
-        .pwrdm_name     = "mpu_pwrdm",
+        .pwrdm          = { .name = "mpu_pwrdm" },
         .flags          = CLKDM_CAN_HWSUP_SWSUP,
         .clktrctrl_mask = OMAP24XX_AUTOSTATE_MPU_MASK,
         .omap_chip      = OMAP_CHIP_INIT(CHIP_IS_OMAP2430),
@@ -64,7 +64,7 @@ static struct clockdomain mpu_2430_clkdm = {
 
 static struct clockdomain mdm_clkdm = {
         .name           = "mdm_clkdm",
-        .pwrdm_name     = "mdm_pwrdm",
+        .pwrdm          = { .name = "mdm_pwrdm" },
         .flags          = CLKDM_CAN_HWSUP_SWSUP,
         .clktrctrl_mask = OMAP2430_AUTOSTATE_MDM_MASK,
         .omap_chip      = OMAP_CHIP_INIT(CHIP_IS_OMAP2430),
@@ -81,7 +81,7 @@ static struct clockdomain mdm_clkdm = {
 
 static struct clockdomain dsp_clkdm = {
         .name           = "dsp_clkdm",
-        .pwrdm_name     = "dsp_pwrdm",
+        .pwrdm          = { .name = "dsp_pwrdm" },
         .flags          = CLKDM_CAN_HWSUP_SWSUP,
         .clktrctrl_mask = OMAP24XX_AUTOSTATE_DSP_MASK,
         .omap_chip      = OMAP_CHIP_INIT(CHIP_IS_OMAP24XX),
@@ -89,7 +89,7 @@ static struct clockdomain dsp_clkdm = {
 
 static struct clockdomain gfx_24xx_clkdm = {
         .name           = "gfx_clkdm",
-        .pwrdm_name     = "gfx_pwrdm",
+        .pwrdm          = { .name = "gfx_pwrdm" },
         .flags          = CLKDM_CAN_HWSUP_SWSUP,
         .clktrctrl_mask = OMAP24XX_AUTOSTATE_GFX_MASK,
         .omap_chip      = OMAP_CHIP_INIT(CHIP_IS_OMAP24XX),
@@ -97,7 +97,7 @@ static struct clockdomain gfx_24xx_clkdm = {
 
 static struct clockdomain core_l3_24xx_clkdm = {
         .name           = "core_l3_clkdm",
-        .pwrdm_name     = "core_pwrdm",
+        .pwrdm          = { .name = "core_pwrdm" },
         .flags          = CLKDM_CAN_HWSUP,
         .clktrctrl_mask = OMAP24XX_AUTOSTATE_L3_MASK,
         .omap_chip      = OMAP_CHIP_INIT(CHIP_IS_OMAP24XX),
@@ -105,7 +105,7 @@ static struct clockdomain core_l3_24xx_clkdm = {
 
 static struct clockdomain core_l4_24xx_clkdm = {
         .name           = "core_l4_clkdm",
-        .pwrdm_name     = "core_pwrdm",
+        .pwrdm          = { .name = "core_pwrdm" },
         .flags          = CLKDM_CAN_HWSUP,
         .clktrctrl_mask = OMAP24XX_AUTOSTATE_L4_MASK,
         .omap_chip      = OMAP_CHIP_INIT(CHIP_IS_OMAP24XX),
@@ -113,7 +113,7 @@ static struct clockdomain core_l4_24xx_clkdm = {
 
 static struct clockdomain dss_24xx_clkdm = {
         .name           = "dss_clkdm",
-        .pwrdm_name     = "core_pwrdm",
+        .pwrdm          = { .name = "core_pwrdm" },
         .flags          = CLKDM_CAN_HWSUP,
         .clktrctrl_mask = OMAP24XX_AUTOSTATE_DSS_MASK,
         .omap_chip      = OMAP_CHIP_INIT(CHIP_IS_OMAP24XX),
@@ -130,7 +130,7 @@ static struct clockdomain dss_24xx_clkdm = {
 
 static struct clockdomain mpu_34xx_clkdm = {
         .name           = "mpu_clkdm",
-        .pwrdm_name     = "mpu_pwrdm",
+        .pwrdm          = { .name = "mpu_pwrdm" },
         .flags          = CLKDM_CAN_HWSUP | CLKDM_CAN_FORCE_WAKEUP,
         .clktrctrl_mask = OMAP3430_CLKTRCTRL_MPU_MASK,
         .omap_chip      = OMAP_CHIP_INIT(CHIP_IS_OMAP3430),
@@ -138,7 +138,7 @@ static struct clockdomain mpu_34xx_clkdm = {
 
 static struct clockdomain neon_clkdm = {
         .name           = "neon_clkdm",
-        .pwrdm_name     = "neon_pwrdm",
+        .pwrdm          = { .name = "neon_pwrdm" },
         .flags          = CLKDM_CAN_HWSUP_SWSUP,
         .clktrctrl_mask = OMAP3430_CLKTRCTRL_NEON_MASK,
         .omap_chip      = OMAP_CHIP_INIT(CHIP_IS_OMAP3430),
@@ -146,7 +146,7 @@ static struct clockdomain neon_clkdm = {
 
 static struct clockdomain iva2_clkdm = {
         .name           = "iva2_clkdm",
-        .pwrdm_name     = "iva2_pwrdm",
+        .pwrdm          = { .name = "iva2_pwrdm" },
         .flags          = CLKDM_CAN_HWSUP_SWSUP,
         .clktrctrl_mask = OMAP3430_CLKTRCTRL_IVA2_MASK,
         .omap_chip      = OMAP_CHIP_INIT(CHIP_IS_OMAP3430),
@@ -154,7 +154,7 @@ static struct clockdomain iva2_clkdm = {
 
 static struct clockdomain gfx_3430es1_clkdm = {
         .name           = "gfx_clkdm",
-        .pwrdm_name     = "gfx_pwrdm",
+        .pwrdm          = { .name = "gfx_pwrdm" },
         .flags          = CLKDM_CAN_HWSUP_SWSUP,
         .clktrctrl_mask = OMAP3430ES1_CLKTRCTRL_GFX_MASK,
         .omap_chip      = OMAP_CHIP_INIT(CHIP_IS_OMAP3430ES1),
@@ -162,7 +162,7 @@ static struct clockdomain gfx_3430es1_clkdm = {
 
 static struct clockdomain sgx_clkdm = {
         .name           = "sgx_clkdm",
-        .pwrdm_name     = "sgx_pwrdm",
+        .pwrdm          = { .name = "sgx_pwrdm" },
         .flags          = CLKDM_CAN_HWSUP_SWSUP,
         .clktrctrl_mask = OMAP3430ES2_CLKTRCTRL_SGX_MASK,
         .omap_chip      = OMAP_CHIP_INIT(CHIP_IS_OMAP3430ES2),
@@ -177,7 +177,7 @@ static struct clockdomain sgx_clkdm = {
  */
 static struct clockdomain d2d_clkdm = {
         .name           = "d2d_clkdm",
-        .pwrdm_name     = "core_pwrdm",
+        .pwrdm          = { .name = "core_pwrdm" },
         .flags          = CLKDM_CAN_HWSUP,
         .clktrctrl_mask = OMAP3430ES1_CLKTRCTRL_D2D_MASK,
         .omap_chip      = OMAP_CHIP_INIT(CHIP_IS_OMAP3430),
@@ -185,7 +185,7 @@ static struct clockdomain d2d_clkdm = {
 
 static struct clockdomain core_l3_34xx_clkdm = {
         .name           = "core_l3_clkdm",
-        .pwrdm_name     = "core_pwrdm",
+        .pwrdm          = { .name = "core_pwrdm" },
         .flags          = CLKDM_CAN_HWSUP,
         .clktrctrl_mask = OMAP3430_CLKTRCTRL_L3_MASK,
         .omap_chip      = OMAP_CHIP_INIT(CHIP_IS_OMAP3430),
@@ -193,7 +193,7 @@ static struct clockdomain core_l3_34xx_clkdm = {
 
 static struct clockdomain core_l4_34xx_clkdm = {
         .name           = "core_l4_clkdm",
-        .pwrdm_name     = "core_pwrdm",
+        .pwrdm          = { .name = "core_pwrdm" },
         .flags          = CLKDM_CAN_HWSUP,
         .clktrctrl_mask = OMAP3430_CLKTRCTRL_L4_MASK,
         .omap_chip      = OMAP_CHIP_INIT(CHIP_IS_OMAP3430),
@@ -201,7 +201,7 @@ static struct clockdomain core_l4_34xx_clkdm = {
 
 static struct clockdomain dss_34xx_clkdm = {
         .name           = "dss_clkdm",
-        .pwrdm_name     = "dss_pwrdm",
+        .pwrdm          = { .name = "dss_pwrdm" },
         .flags          = CLKDM_CAN_HWSUP_SWSUP,
         .clktrctrl_mask = OMAP3430_CLKTRCTRL_DSS_MASK,
         .omap_chip      = OMAP_CHIP_INIT(CHIP_IS_OMAP3430),
@@ -209,7 +209,7 @@ static struct clockdomain dss_34xx_clkdm = {
 
 static struct clockdomain cam_clkdm = {
         .name           = "cam_clkdm",
-        .pwrdm_name     = "cam_pwrdm",
+        .pwrdm          = { .name = "cam_pwrdm" },
         .flags          = CLKDM_CAN_HWSUP_SWSUP,
         .clktrctrl_mask = OMAP3430_CLKTRCTRL_CAM_MASK,
         .omap_chip      = OMAP_CHIP_INIT(CHIP_IS_OMAP3430),
@@ -217,7 +217,7 @@ static struct clockdomain cam_clkdm = {
 
 static struct clockdomain usbhost_clkdm = {
         .name           = "usbhost_clkdm",
-        .pwrdm_name     = "usbhost_pwrdm",
+        .pwrdm          = { .name = "usbhost_pwrdm" },
         .flags          = CLKDM_CAN_HWSUP_SWSUP,
         .clktrctrl_mask = OMAP3430ES2_CLKTRCTRL_USBHOST_MASK,
         .omap_chip      = OMAP_CHIP_INIT(CHIP_IS_OMAP3430ES2),
@@ -225,7 +225,7 @@ static struct clockdomain usbhost_clkdm = {
 
 static struct clockdomain per_clkdm = {
         .name           = "per_clkdm",
-        .pwrdm_name     = "per_pwrdm",
+        .pwrdm          = { .name = "per_pwrdm" },
         .flags          = CLKDM_CAN_HWSUP_SWSUP,
         .clktrctrl_mask = OMAP3430_CLKTRCTRL_PER_MASK,
         .omap_chip      = OMAP_CHIP_INIT(CHIP_IS_OMAP3430),
@@ -233,7 +233,7 @@ static struct clockdomain per_clkdm = {
 
 static struct clockdomain emu_clkdm = {
         .name           = "emu_clkdm",
-        .pwrdm_name     = "emu_pwrdm",
+        .pwrdm          = { .name = "emu_pwrdm" },
         .flags          = CLKDM_CAN_ENABLE_AUTO | CLKDM_CAN_SWSUP,
         .clktrctrl_mask = OMAP3430_CLKTRCTRL_EMU_MASK,
         .omap_chip      = OMAP_CHIP_INIT(CHIP_IS_OMAP3430),
@@ -247,14 +247,16 @@ static struct clockdomain emu_clkdm = {
 
 static struct clkdm_pwrdm_autodep clkdm_pwrdm_autodeps[] = {
         {
-                .pwrdm_name = "mpu_pwrdm",
+                .pwrdm     = { .name = "mpu_pwrdm" },
                 .omap_chip = OMAP_CHIP_INIT(CHIP_IS_OMAP3430)
         },
         {
-                .pwrdm_name = "iva2_pwrdm",
+                .pwrdm     = { .name = "iva2_pwrdm" },
                 .omap_chip = OMAP_CHIP_INIT(CHIP_IS_OMAP3430)
         },
-        { NULL }
+        {
+                .pwrdm     = { .name = NULL },
+        }
 };
 
 /*
diff --git a/arch/arm/plat-omap/include/mach/clockdomain.h b/arch/arm/plat-omap/include/mach/clockdomain.h
index 1f51f0173784..b9d0dd2da89b 100644
--- a/arch/arm/plat-omap/include/mach/clockdomain.h
+++ b/arch/arm/plat-omap/include/mach/clockdomain.h
@@ -1,5 +1,5 @@
 /*
- * linux/include/asm-arm/arch-omap/clockdomain.h
+ * arch/arm/plat-omap/include/mach/clockdomain.h
  *
  * OMAP2/3 clockdomain framework functions
  *
@@ -48,11 +48,13 @@
  */
 struct clkdm_pwrdm_autodep {
 
-        /* Name of the powerdomain to add a wkdep/sleepdep on */
-        const char *pwrdm_name;
+        union {
+                /* Name of the powerdomain to add a wkdep/sleepdep on */
+                const char *name;
 
-        /* Powerdomain pointer (looked up at clkdm_init() time) */
-        struct powerdomain *pwrdm;
+                /* Powerdomain pointer (looked up at clkdm_init() time) */
+                struct powerdomain *ptr;
+        } pwrdm;
 
         /* OMAP chip types that this clockdomain dep is valid on */
         const struct omap_chip_id omap_chip;
@@ -64,8 +66,13 @@ struct clockdomain {
         /* Clockdomain name */
         const char *name;
 
-        /* Powerdomain enclosing this clockdomain */
-        const char *pwrdm_name;
+        union {
+                /* Powerdomain enclosing this clockdomain */
+                const char *name;
+
+                /* Powerdomain pointer assigned at clkdm_register() */
+                struct powerdomain *ptr;
+        } pwrdm;
 
         /* CLKTRCTRL/AUTOSTATE field mask in CM_CLKSTCTRL reg */
         const u16 clktrctrl_mask;
@@ -79,9 +86,6 @@ struct clockdomain {
         /* Usecount tracking */
         atomic_t usecount;
 
-        /* Powerdomain pointer assigned at clkdm_register() */
-        struct powerdomain *pwrdm;
-
         struct list_head node;
 
 };