clk: imx: Update the compsite driver to support imx8ulp

On i.MX8ULP, some peripherals have a sw_rst control resides
in the per device PCC clock control register, all others are
same as i.MX7ULP, so update the 7ulp clock composite driver to
support i.MX8ULP to maxmimize the code reuse.
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Jacky Bai <ping.bai@nxp.com>
Reviewed-by: Abel Vesa <abel.vesa@nxp.com>
Link: https://lore.kernel.org/r/20210914065208.3582128-4-ping.bai@nxp.comSigned-off-by: Abel Vesa <abel.vesa@nxp.com>

drivers/clk/imx/clk-composite-7ulp.c

@@ -23,11 +23,50 @@
 #define PCG_PCD_WIDTH	3
 #define PCG_PCD_MASK	0x7
 
-struct clk_hw *imx7ulp_clk_hw_composite(const char *name,
+#define SW_RST		BIT(28)
+
+static int pcc_gate_enable(struct clk_hw *hw)
+{
+	struct clk_gate *gate = to_clk_gate(hw);
+	u32 val;
+	int ret;
+
+	ret = clk_gate_ops.enable(hw);
+	if (ret)
+		return ret;
+
+	/*
+	 * release the sw reset for peripherals associated with
+	 * with this pcc clock.
+	 */
+	val = readl(gate->reg);
+	val |= SW_RST;
+	writel(val, gate->reg);
+
+	return 0;
+}
+
+static void pcc_gate_disable(struct clk_hw *hw)
+{
+	clk_gate_ops.disable(hw);
+}
+
+static int pcc_gate_is_enabled(struct clk_hw *hw)
+{
+	return clk_gate_ops.is_enabled(hw);
+}
+
+static const struct clk_ops pcc_gate_ops = {
+	.enable = pcc_gate_enable,
+	.disable = pcc_gate_disable,
+	.is_enabled = pcc_gate_is_enabled,
+};
+
+static struct clk_hw *imx_ulp_clk_hw_composite(const char *name,
 				     const char * const *parent_names,
 				     int num_parents, bool mux_present,
 				     bool rate_present, bool gate_present,
-				     void __iomem *reg)
+				     void __iomem *reg, bool has_swrst)
 {
 	struct clk_hw *mux_hw = NULL, *fd_hw = NULL, *gate_hw = NULL;
 	struct clk_fractional_divider *fd = NULL;
@@ -77,7 +116,7 @@ struct clk_hw *imx7ulp_clk_hw_composite(const char *name,
 	hw = clk_hw_register_composite(NULL, name, parent_names, num_parents,
 				       mux_hw, &clk_mux_ops, fd_hw,
 				       &clk_fractional_divider_ops, gate_hw,
-				       &clk_gate_ops, CLK_SET_RATE_GATE |
+				       has_swrst ? &pcc_gate_ops : &clk_gate_ops, CLK_SET_RATE_GATE |
 				       CLK_SET_PARENT_GATE);
 	if (IS_ERR(hw)) {
 		kfree(mux);
@@ -87,3 +126,19 @@ struct clk_hw *imx7ulp_clk_hw_composite(const char *name,
 
 	return hw;
 }
+
+struct clk_hw *imx7ulp_clk_hw_composite(const char *name, const char * const *parent_names,
+				int num_parents, bool mux_present, bool rate_present,
+				bool gate_present, void __iomem *reg)
+{
+	return imx_ulp_clk_hw_composite(name, parent_names, num_parents, mux_present, rate_present,
+					gate_present, reg, false);
+}
+
+struct clk_hw *imx8ulp_clk_hw_composite(const char *name, const char * const *parent_names,
+				int num_parents, bool mux_present, bool rate_present,
+				bool gate_present, void __iomem *reg, bool has_swrst)
+{
+	return imx_ulp_clk_hw_composite(name, parent_names, num_parents, mux_present, rate_present,
+					gate_present, reg, has_swrst);
+}

drivers/clk/imx/clk.h

@@ -287,6 +287,12 @@ struct clk_hw *imx7ulp_clk_hw_composite(const char *name,
 				     bool rate_present, bool gate_present,
 				     void __iomem *reg);
 
+struct clk_hw *imx8ulp_clk_hw_composite(const char *name,
+				     const char * const *parent_names,
+				     int num_parents, bool mux_present,
+				     bool rate_present, bool gate_present,
+				     void __iomem *reg, bool has_swrst);
+
 struct clk_hw *imx_clk_hw_fixup_divider(const char *name, const char *parent,
 				  void __iomem *reg, u8 shift, u8 width,
 				  void (*fixup)(u32 *val));