[PATCH 0/5] clk: ti: add support for dra76x latched clocks

@@ -75,6 +75,9 @@ Optional properties:
 - ti,invert-autoidle-bit : autoidle is enabled by setting the bit to 0,
   see [2]
 - ti,set-rate-parent : clk_set_rate is propagated to parent
+- ti,latch-bit : latch the divider value to HW, only needed if the register
+  access requires this. As an example dra76x DPLL_GMAC H14 divider implements
+  such behavior.
 
 Examples:
 dpll_usb_m2_ck: dpll_usb_m2_ck@4a008190 {

@@ -48,6 +48,9 @@ Optional properties:
   zero
 - ti,set-rate-parent : clk_set_rate is propagated to parent clock,
   not supported by the composite-mux-clock subtype
+- ti,latch-bit : latch the mux value to HW, only needed if the register
+  access requires this. As an example, dra7x DPLL_GMAC H14 muxing
+  implements such behavior.
 
 Examples:
 

@@ -275,6 +275,20 @@ int ti_clk_get_reg_addr(struct device_node *node, int index,
 	return 0;
 }
 
+void ti_clk_latch(struct clk_omap_reg *reg, s8 shift)
+{
+	u32 latch;
+
+	if (shift < 0)
+		return;
+
+	latch = 1 << shift;
+
+	ti_clk_ll_ops->clk_rmw(latch, latch, reg);
+	ti_clk_ll_ops->clk_rmw(0, latch, reg);
+	ti_clk_ll_ops->clk_readl(reg); /* OCP barrier */
+}
+
 /**
  * omap2_clk_provider_init - init master clock provider
  * @parent: master node

@@ -194,6 +194,8 @@ struct clk *ti_clk_register(struct device *dev, struct clk_hw *hw,
 int ti_clk_add_alias(struct device *dev, struct clk *clk, const char *con);
 void ti_clk_add_aliases(void);
 
+void ti_clk_latch(struct clk_omap_reg *reg, s8 shift);
+
 struct clk_hw *ti_clk_build_component_mux(struct ti_clk_mux *setup);
 
 int ti_clk_parse_divider_data(int *div_table, int num_dividers, int max_div,

@@ -34,6 +34,7 @@ struct clk_omap_mux {
 	u32			*table;
 	u32			mask;
 	u8			shift;
+	s8			latch;
 	u8			flags;
 };
 

@@ -86,6 +86,7 @@ static int ti_clk_mux_set_parent(struct clk_hw *hw, u8 index)
 	}
 	val |= index << mux->shift;
 	ti_clk_ll_ops->clk_writel(val, &mux->reg);
+	ti_clk_latch(&mux->reg, mux->latch);
 
 	return 0;
 }

@@ -100,7 +101,7 @@ static struct clk *_register_mux(struct device *dev, const char *name,
 				 const char * const *parent_names,
 				 u8 num_parents, unsigned long flags,
 				 struct clk_omap_reg *reg, u8 shift, u32 mask,
-				 u8 clk_mux_flags, u32 *table)
+				 s8 latch, u8 clk_mux_flags, u32 *table)
 {
 	struct clk_omap_mux *mux;
 	struct clk *clk;

@@ -121,6 +122,7 @@ static struct clk *_register_mux(struct device *dev, const char *name,
 	memcpy(&mux->reg, reg, sizeof(*reg));
 	mux->shift = shift;
 	mux->mask = mask;
+	mux->latch = latch;
 	mux->flags = clk_mux_flags;
 	mux->table = table;
 	mux->hw.init = &init;

@@ -160,7 +162,7 @@ struct clk *ti_clk_register_mux(struct ti_clk *setup)
 		flags |= CLK_SET_RATE_PARENT;
 
 	return _register_mux(NULL, setup->name, mux->parents, mux->num_parents,
-			     flags, &reg, mux->bit_shift, mask,
+			     flags, &reg, mux->bit_shift, mask, -EINVAL,
 			     mux_flags, NULL);
 }
 

@@ -179,6 +181,7 @@ static void of_mux_clk_setup(struct device_node *node)
 	u8 clk_mux_flags = 0;
 	u32 mask = 0;
 	u32 shift = 0;
+	s32 latch = -EINVAL;
 	u32 flags = CLK_SET_RATE_NO_REPARENT;
 
 	num_parents = of_clk_get_parent_count(node);

@@ -197,6 +200,8 @@ static void of_mux_clk_setup(struct device_node *node)
 
 	of_property_read_u32(node, "ti,bit-shift", &shift);
 
+	of_property_read_u32(node, "ti,latch-bit", &latch);
+
 	if (of_property_read_bool(node, "ti,index-starts-at-one"))
 		clk_mux_flags |= CLK_MUX_INDEX_ONE;
 

@@ -211,7 +216,8 @@ static void of_mux_clk_setup(struct device_node *node)
 	mask = (1 << fls(mask)) - 1;
 
 	clk = _register_mux(NULL, node->name, parent_names, num_parents,
-			    flags, &reg, shift, mask, clk_mux_flags, NULL);
+			    flags, &reg, shift, mask, latch, clk_mux_flags,
+			    NULL);
 
 	if (!IS_ERR(clk))
 		of_clk_add_provider(node, of_clk_src_simple_get, clk);

@@ -234,6 +240,7 @@ struct clk_hw *ti_clk_build_component_mux(struct ti_clk_mux *setup)
 		return ERR_PTR(-ENOMEM);
 
 	mux->shift = setup->bit_shift;
+	mux->latch = -EINVAL;
 
 	mux->reg.index = setup->module;
 	mux->reg.offset = setup->reg;