[PATCH V3 3/5] clk: imx: add i.MX93 composite clk

[Peng Fan (OSS)]

From: Peng Fan <peng.fan at nxp.com>

i.MX93 CCM ROOT clock has a mux, gate and divider in one register, here
is to combine all these into one composite clk and simplify clk tree.
i.MX93 CCM is a new IP compared with i.MX8M, so introduce a new file.

Signed-off-by: Peng Fan <peng.fan at nxp.com>
---
 drivers/clk/imx/Makefile           |  1 +
 drivers/clk/imx/clk-composite-93.c | 93 ++++++++++++++++++++++++++++++
 drivers/clk/imx/clk.h              |  9 +++
 3 files changed, 103 insertions(+)
 create mode 100644 drivers/clk/imx/clk-composite-93.c

diff --git a/drivers/clk/imx/Makefile b/drivers/clk/imx/Makefile
index aa8f5204d7e1..36c04922d789 100644
--- a/drivers/clk/imx/Makefile
+++ b/drivers/clk/imx/Makefile
@@ -4,6 +4,7 @@ mxc-clk-objs += clk.o
 mxc-clk-objs += clk-busy.o
 mxc-clk-objs += clk-composite-7ulp.o
 mxc-clk-objs += clk-composite-8m.o
+mxc-clk-objs += clk-composite-93.o
 mxc-clk-objs += clk-cpu.o
 mxc-clk-objs += clk-divider-gate.o
 mxc-clk-objs += clk-fixup-div.o
diff --git a/drivers/clk/imx/clk-composite-93.c b/drivers/clk/imx/clk-composite-93.c
new file mode 100644
index 000000000000..b44619aa5ca5
--- /dev/null
+++ b/drivers/clk/imx/clk-composite-93.c
@@ -0,0 +1,93 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2021 NXP
+ *
+ * Peng Fan <peng.fan at nxp.com>
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/errno.h>
+#include <linux/export.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+
+#include "clk.h"
+
+#define CCM_DIV_SHIFT	0
+#define CCM_DIV_WIDTH	8
+#define CCM_MUX_SHIFT	8
+#define CCM_MUX_MASK	3
+#define CCM_OFF_SHIFT	24
+
+#define AUTHEN_OFFSET	0x30
+#define TZ_NS_SHIFT	9
+#define TZ_NS_MASK	BIT(9)
+
+struct clk_hw *imx93_clk_composite_flags(const char *name, const char * const *parent_names,
+					 int num_parents, void __iomem *reg,
+					 unsigned long flags)
+{
+	struct clk_hw *hw = ERR_PTR(-ENOMEM), *mux_hw;
+	struct clk_hw *div_hw, *gate_hw;
+	struct clk_divider *div = NULL;
+	struct clk_gate *gate = NULL;
+	struct clk_mux *mux = NULL;
+	bool clk_ro = false;
+
+	mux = kzalloc(sizeof(*mux), GFP_KERNEL);
+	if (!mux)
+		goto fail;
+
+	mux_hw = &mux->hw;
+	mux->reg = reg;
+	mux->shift = CCM_MUX_SHIFT;
+	mux->mask = CCM_MUX_MASK;
+	mux->lock = &imx_ccm_lock;
+
+	div = kzalloc(sizeof(*div), GFP_KERNEL);
+	if (!div)
+		goto fail;
+
+	div_hw = &div->hw;
+	div->reg = reg;
+	div->shift = CCM_DIV_SHIFT;
+	div->width = CCM_DIV_WIDTH;
+	div->lock = &imx_ccm_lock;
+	div->flags = CLK_DIVIDER_ROUND_CLOSEST;
+
+	if (!(readl(reg + AUTHEN_OFFSET) & TZ_NS_MASK))
+		clk_ro = true;
+
+	if (clk_ro) {
+		hw = clk_hw_register_composite(NULL, name, parent_names, num_parents,
+					       mux_hw, &clk_mux_ro_ops, div_hw,
+					       &clk_divider_ro_ops, NULL, NULL, flags);
+	} else {
+		gate = kzalloc(sizeof(*gate), GFP_KERNEL);
+		if (!gate)
+			goto fail;
+
+		gate_hw = &gate->hw;
+		gate->reg = reg;
+		gate->bit_idx = CCM_OFF_SHIFT;
+		gate->lock = &imx_ccm_lock;
+		gate->flags = CLK_GATE_SET_TO_DISABLE;
+
+		hw = clk_hw_register_composite(NULL, name, parent_names, num_parents,
+					       mux_hw, &clk_mux_ops, div_hw,
+					       &clk_divider_ops, gate_hw,
+					       &clk_gate_ops, flags | CLK_SET_RATE_NO_REPARENT);
+	}
+
+	if (IS_ERR(hw))
+		goto fail;
+
+	return hw;
+
+fail:
+	kfree(gate);
+	kfree(div);
+	kfree(mux);
+	return ERR_CAST(hw);
+}
+EXPORT_SYMBOL_GPL(imx93_clk_composite_flags);
diff --git a/drivers/clk/imx/clk.h b/drivers/clk/imx/clk.h
index 7d220a01de1f..63eb7c53b123 100644
--- a/drivers/clk/imx/clk.h
+++ b/drivers/clk/imx/clk.h
@@ -419,6 +419,15 @@ struct clk_hw *__imx8m_clk_hw_composite(const char *name,
 			IMX_COMPOSITE_FW_MANAGED, \
 			IMX_COMPOSITE_CLK_FLAGS_CRITICAL_GET_RATE_NO_CACHE)
 
+struct clk_hw *imx93_clk_composite_flags(const char *name,
+					 const char * const *parent_names,
+					 int num_parents,
+					 void __iomem *reg,
+					 unsigned long flags);
+#define imx93_clk_composite(name, parent_names, num_parents, reg) \
+	imx93_clk_composite_flags(name, parent_names, num_parents, reg, \
+				  CLK_SET_RATE_NO_REPARENT | CLK_OPS_PARENT_ENABLE)
+
 struct clk_hw *imx_clk_hw_divider_gate(const char *name, const char *parent_name,
 		unsigned long flags, void __iomem *reg, u8 shift, u8 width,
 		u8 clk_divider_flags, const struct clk_div_table *table,
-- 
2.25.1