clk: renesas: rzg2l: Make use of CLK_MON registers optional

The RZ/V2M SoC doesn't use CLK_MON registers, so make them optional.

Signed-off-by: Phil Edworthy <phil.edworthy@renesas.com>
Reviewed-by: Biju Das <biju.das.jz@bp.renesas.com>
Link: https://lore.kernel.org/r/20220503115557.53370-9-phil.edworthy@renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

drivers/clk/renesas/r9a07g043-cpg.c

@@ -315,4 +315,6 @@ const struct rzg2l_cpg_info r9a07g043_cpg_info = {
 	/* Resets */
 	.resets = r9a07g043_resets,
 	.num_resets = R9A07G043_TSU_PRESETN + 1, /* Last reset ID + 1 */
+
+	.has_clk_mon_regs = true,
 };

drivers/clk/renesas/r9a07g044-cpg.c

@@ -418,6 +418,8 @@ const struct rzg2l_cpg_info r9a07g044_cpg_info = {
 	/* Resets */
 	.resets = r9a07g044_resets,
 	.num_resets = R9A07G044_TSU_PRESETN + 1, /* Last reset ID + 1 */
+
+	.has_clk_mon_regs = true,
 };
 
 #ifdef CONFIG_CLK_R9A07G054
@@ -440,5 +442,7 @@ const struct rzg2l_cpg_info r9a07g054_cpg_info = {
 	/* Resets */
 	.resets = r9a07g044_resets,
 	.num_resets = R9A07G054_STPAI_ARESETN + 1, /* Last reset ID + 1 */
+
+	.has_clk_mon_regs = true,
 };
 #endif

drivers/clk/renesas/rzg2l-cpg.c

@@ -926,6 +926,9 @@ static int rzg2l_mod_clock_endisable(struct clk_hw *hw, bool enable)
 	if (!enable)
 		return 0;
 
+	if (!priv->info->has_clk_mon_regs)
+		return 0;
+
 	for (i = 1000; i > 0; --i) {
 		if (((readl(priv->base + CLK_MON_R(reg))) & bitmask))
 			break;
@@ -996,7 +999,10 @@ static int rzg2l_mod_clock_is_enabled(struct clk_hw *hw)
 	if (clock->sibling)
 		return clock->enabled;
 
-	value = readl(priv->base + CLK_MON_R(clock->off));
+	if (priv->info->has_clk_mon_regs)
+		value = readl(priv->base + CLK_MON_R(clock->off));
+	else
+		value = readl(priv->base + clock->off);
 
 	return value & bitmask;
 }

drivers/clk/renesas/rzg2l-cpg.h

@@ -236,6 +236,7 @@ struct rzg2l_reset {
  * @crit_mod_clks: Array with Module Clock IDs of critical clocks that
  *                 should not be disabled without a knowledgeable driver
  * @num_crit_mod_clks: Number of entries in crit_mod_clks[]
+ * @has_clk_mon_regs: Flag indicating whether the SoC has CLK_MON registers
  */
 struct rzg2l_cpg_info {
 	/* Core Clocks */
@@ -256,6 +257,8 @@ struct rzg2l_cpg_info {
 	/* Critical Module Clocks that should not be disabled */
 	const unsigned int *crit_mod_clks;
 	unsigned int num_crit_mod_clks;
+
+	bool has_clk_mon_regs;
 };
 
 extern const struct rzg2l_cpg_info r9a07g043_cpg_info;