clk: ti: dflt: fix enable_reg validity check

The default clock enabling functions for TI clocks -
omap2_dflt_clk_enable() and omap2_dflt_clk_disable() perform a
NULL check for the enable_reg field of the clk_hw_omap structure.
This enable_reg field however is merely a combination of the index
of the master IP module, and the offset from the master IP module's
base address. A value of 0 is perfectly valid, and the current error
checking will fail in these cases. The issue was found when trying
to enable the iva2_ck clock on OMAP3 platforms.

So, switch the check to use IS_ERR. This correction is similar to the
logic used in commit c807dbedb5e5 ("clk: ti: fix ti_clk_get_reg_addr
error handling").

Fixes: 9f37e90efaf0 ("clk: ti: dflt: move support for default gate clock..")
Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Tero Kristo <t-kristo@ti.com>

diff --git a/drivers/clk/ti/clkt_dflt.c b/drivers/clk/ti/clkt_dflt.c
index 90d7d8a..1ddc288 100644 (file)
--- a/drivers/clk/ti/clkt_dflt.c
+++ b/drivers/clk/ti/clkt_dflt.c
@@ -222,7 +222,7 @@ int omap2_dflt_clk_enable(struct clk_hw *hw)
                }
        }
 
-       if (unlikely(!clk->enable_reg)) {
+       if (unlikely(IS_ERR(clk->enable_reg))) {
                pr_err("%s: %s missing enable_reg\n", __func__,
                       clk_hw_get_name(hw));
                ret = -EINVAL;
@@ -264,7 +264,7 @@ void omap2_dflt_clk_disable(struct clk_hw *hw)
        u32 v;
 
        clk = to_clk_hw_omap(hw);
-       if (!clk->enable_reg) {
+       if (IS_ERR(clk->enable_reg)) {
                /*
                 * 'independent' here refers to a clock which is not
                 * controlled by its parent.