clk: sprd: add composite clock support

This patch introduced composite driver for Spreadtrum's SoCs. The
functions of this composite clock simply consist of divider and
mux clocks.

Signed-off-by: Chunyan Zhang <chunyan.zhang@spreadtrum.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

1 files changed, 60 insertions, 0 deletions

diff --git a/drivers/clk/sprd/composite.c b/drivers/clk/sprd/composite.c
new file mode 100644
index 000000000000..ebb644820b1e
--- /dev/null
+++ b/drivers/clk/sprd/composite.c
@@ -0,0 +1,60 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Spreadtrum composite clock driver
+//
+// Copyright (C) 2017 Spreadtrum, Inc.
+// Author: Chunyan Zhang <chunyan.zhang@spreadtrum.com>
+
+#include <linux/clk-provider.h>
+
+#include "composite.h"
+
+static long sprd_comp_round_rate(struct clk_hw *hw, unsigned long rate,
+				unsigned long *parent_rate)
+{
+	struct sprd_comp *cc = hw_to_sprd_comp(hw);
+
+	return sprd_div_helper_round_rate(&cc->common, &cc->div,
+					 rate, parent_rate);
+}
+
+static unsigned long sprd_comp_recalc_rate(struct clk_hw *hw,
+					  unsigned long parent_rate)
+{
+	struct sprd_comp *cc = hw_to_sprd_comp(hw);
+
+	return sprd_div_helper_recalc_rate(&cc->common, &cc->div, parent_rate);
+}
+
+static int sprd_comp_set_rate(struct clk_hw *hw, unsigned long rate,
+			     unsigned long parent_rate)
+{
+	struct sprd_comp *cc = hw_to_sprd_comp(hw);
+
+	return sprd_div_helper_set_rate(&cc->common, &cc->div,
+				       rate, parent_rate);
+}
+
+static u8 sprd_comp_get_parent(struct clk_hw *hw)
+{
+	struct sprd_comp *cc = hw_to_sprd_comp(hw);
+
+	return sprd_mux_helper_get_parent(&cc->common, &cc->mux);
+}
+
+static int sprd_comp_set_parent(struct clk_hw *hw, u8 index)
+{
+	struct sprd_comp *cc = hw_to_sprd_comp(hw);
+
+	return sprd_mux_helper_set_parent(&cc->common, &cc->mux, index);
+}
+
+const struct clk_ops sprd_comp_ops = {
+	.get_parent	= sprd_comp_get_parent,
+	.set_parent	= sprd_comp_set_parent,
+
+	.round_rate	= sprd_comp_round_rate,
+	.recalc_rate	= sprd_comp_recalc_rate,
+	.set_rate	= sprd_comp_set_rate,
+};
+EXPORT_SYMBOL_GPL(sprd_comp_ops);