clk: imx8m: check mcore_booted before register clk

If mcore_booted is true, ignore the clk root gate registration and
this will simplify AMP clock management and avoid system hang unexpectly
especially Linux shutdown clk used by mcore.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Abel Vesa <abel.vesa@nxp.com>
Link: https://lore.kernel.org/r/20220228124112.3974242-2-peng.fan@oss.nxp.com
[abelvesa@kernel.org: Removed if-case for when mcore_booted is true]
Signed-off-by: Abel Vesa <abel.vesa@nxp.com>

drivers/clk/imx/clk-composite-8m.c

@@ -178,7 +178,7 @@ struct clk_hw *__imx8m_clk_hw_composite(const char *name,
 					unsigned long flags)
 {
 	struct clk_hw *hw = ERR_PTR(-ENOMEM), *mux_hw;
-	struct clk_hw *div_hw, *gate_hw;
+	struct clk_hw *div_hw, *gate_hw = NULL;
 	struct clk_divider *div = NULL;
 	struct clk_gate *gate = NULL;
 	struct clk_mux *mux = NULL;
@@ -223,14 +223,17 @@ struct clk_hw *__imx8m_clk_hw_composite(const char *name,
 	div->lock = &imx_ccm_lock;
 	div->flags = CLK_DIVIDER_ROUND_CLOSEST;
 
-	gate = kzalloc(sizeof(*gate), GFP_KERNEL);
-	if (!gate)
-		goto fail;
+	/* skip registering the gate ops if M4 is enabled */
+	if (!mcore_booted) {
+		gate = kzalloc(sizeof(*gate), GFP_KERNEL);
+		if (!gate)
+			goto fail;
 
-	gate_hw = &gate->hw;
-	gate->reg = reg;
-	gate->bit_idx = PCG_CGC_SHIFT;
-	gate->lock = &imx_ccm_lock;
+		gate_hw = &gate->hw;
+		gate->reg = reg;
+		gate->bit_idx = PCG_CGC_SHIFT;
+		gate->lock = &imx_ccm_lock;
+	}
 
 	hw = clk_hw_register_composite(NULL, name, parent_names, num_parents,
 			mux_hw, mux_ops, div_hw,