OMAP4: clockdomain: bypass unimplemented wake-up dependency functions on OMAP4

Commit 56a6a19dffda6b75cef8d4183c7c6ff650025cbd ("omap2plus: prm:
Trvial build break fix for undefined reference to
'omap2_prm_read_mod_reg'") generates a lot of warnings on boot since
clockdomain functions that manipulate wake-up dependencies are not
implemented yet on OMAP4 for 2.6.38.  This patch bypasses the OMAP2/3
functions on OMAP4, which in turn avoids the warnings when the
functions would attempt to call the underlying OMAP2/3 PRCM functions.
A one-line warning is still logged from the clockdomain code that the
OMAP4 wake-up dependency code is not yet implemented.

A clockdomain wake-up and sleep dependency implementation for OMAP4
from Rajendra should be possible to merge during the 2.6.39 merge
window:

    http://www.mail-archive.com/linux-omap@vger.kernel.org/msg41748.html

    http://www.mail-archive.com/linux-omap@vger.kernel.org/msg42222.html

Reported-by: Russell King <rmk+kernel@arm.linux.org.uk>
Cc: Rajendra Nayak <rnayak@ti.com>
Cc: Benoît Cousson <b-cousson@ti.com>
Cc: Santosh Shilimkar <santosh.shilimkar@ti.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: Paul Walmsley <paul@pwsan.com>

1 files changed, 26 insertions, 4 deletions

diff --git a/arch/arm/mach-omap2/clockdomain.c b/arch/arm/mach-omap2/clockdomain.c
index e20b98636ab..58e42f76603 100644
--- a/arch/arm/mach-omap2/clockdomain.c
+++ b/arch/arm/mach-omap2/clockdomain.c
@@ -423,6 +423,12 @@ int clkdm_add_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2)
 {
         struct clkdm_dep *cd;
 
+        if (!cpu_is_omap24xx() && !cpu_is_omap34xx()) {
+                pr_err("clockdomain: %s/%s: %s: not yet implemented\n",
+                       clkdm1->name, clkdm2->name, __func__);
+                return -EINVAL;
+        }
+
         if (!clkdm1 || !clkdm2)
                 return -EINVAL;
 
@@ -458,6 +464,12 @@ int clkdm_del_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2)
 {
         struct clkdm_dep *cd;
 
+        if (!cpu_is_omap24xx() && !cpu_is_omap34xx()) {
+                pr_err("clockdomain: %s/%s: %s: not yet implemented\n",
+                       clkdm1->name, clkdm2->name, __func__);
+                return -EINVAL;
+        }
+
         if (!clkdm1 || !clkdm2)
                 return -EINVAL;
 
@@ -500,6 +512,12 @@ int clkdm_read_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2)
         if (!clkdm1 || !clkdm2)
                 return -EINVAL;
 
+        if (!cpu_is_omap24xx() && !cpu_is_omap34xx()) {
+                pr_err("clockdomain: %s/%s: %s: not yet implemented\n",
+                       clkdm1->name, clkdm2->name, __func__);
+                return -EINVAL;
+        }
+
         cd = _clkdm_deps_lookup(clkdm2, clkdm1->wkdep_srcs);
         if (IS_ERR(cd)) {
                 pr_debug("clockdomain: hardware cannot set/clear wake up of "
@@ -527,6 +545,12 @@ int clkdm_clear_all_wkdeps(struct clockdomain *clkdm)
         struct clkdm_dep *cd;
         u32 mask = 0;
 
+        if (!cpu_is_omap24xx() && !cpu_is_omap34xx()) {
+                pr_err("clockdomain: %s: %s: not yet implemented\n",
+                       clkdm->name, __func__);
+                return -EINVAL;
+        }
+
         if (!clkdm)
                 return -EINVAL;
 
@@ -830,8 +854,7 @@ void omap2_clkdm_allow_idle(struct clockdomain *clkdm)
          * dependency code and data for OMAP4.
          */
         if (cpu_is_omap44xx()) {
-                WARN_ONCE(1, "clockdomain: OMAP4 wakeup/sleep dependency "
-                          "support is not yet implemented\n");
+                pr_err("clockdomain: %s: OMAP4 wakeup/sleep dependency support: not yet implemented\n", clkdm->name);
         } else {
                 if (atomic_read(&clkdm->usecount) > 0)
                         _clkdm_add_autodeps(clkdm);
@@ -872,8 +895,7 @@ void omap2_clkdm_deny_idle(struct clockdomain *clkdm)
          * dependency code and data for OMAP4.
          */
         if (cpu_is_omap44xx()) {
-                WARN_ONCE(1, "clockdomain: OMAP4 wakeup/sleep dependency "
-                          "support is not yet implemented\n");
+                pr_err("clockdomain: %s: OMAP4 wakeup/sleep dependency support: not yet implemented\n", clkdm->name);
         } else {
                 if (atomic_read(&clkdm->usecount) > 0)
                         _clkdm_del_autodeps(clkdm);