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path: root/drivers/clk/sprd
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-rw-r--r--drivers/clk/sprd/Kconfig4
-rw-r--r--drivers/clk/sprd/Makefile3
-rw-r--r--drivers/clk/sprd/common.c96
-rw-r--r--drivers/clk/sprd/common.h38
4 files changed, 141 insertions, 0 deletions
diff --git a/drivers/clk/sprd/Kconfig b/drivers/clk/sprd/Kconfig
new file mode 100644
index 000000000000..67a3287c00a2
--- /dev/null
+++ b/drivers/clk/sprd/Kconfig
@@ -0,0 +1,4 @@
+config SPRD_COMMON_CLK
+ tristate "Clock support for Spreadtrum SoCs"
+ depends on ARCH_SPRD || COMPILE_TEST
+ default ARCH_SPRD
diff --git a/drivers/clk/sprd/Makefile b/drivers/clk/sprd/Makefile
new file mode 100644
index 000000000000..74f4b808fe48
--- /dev/null
+++ b/drivers/clk/sprd/Makefile
@@ -0,0 +1,3 @@
+obj-$(CONFIG_SPRD_COMMON_CLK) += clk-sprd.o
+
+clk-sprd-y += common.o
diff --git a/drivers/clk/sprd/common.c b/drivers/clk/sprd/common.c
new file mode 100644
index 000000000000..e038b0447206
--- /dev/null
+++ b/drivers/clk/sprd/common.c
@@ -0,0 +1,96 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Spreadtrum clock infrastructure
+//
+// Copyright (C) 2017 Spreadtrum, Inc.
+// Author: Chunyan Zhang <chunyan.zhang@spreadtrum.com>
+
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/regmap.h>
+
+#include "common.h"
+
+static const struct regmap_config sprdclk_regmap_config = {
+ .reg_bits = 32,
+ .reg_stride = 4,
+ .val_bits = 32,
+ .max_register = 0xffff,
+ .fast_io = true,
+};
+
+static void sprd_clk_set_regmap(const struct sprd_clk_desc *desc,
+ struct regmap *regmap)
+{
+ int i;
+ struct sprd_clk_common *cclk;
+
+ for (i = 0; i < desc->num_clk_clks; i++) {
+ cclk = desc->clk_clks[i];
+ if (!cclk)
+ continue;
+
+ cclk->regmap = regmap;
+ }
+}
+
+int sprd_clk_regmap_init(struct platform_device *pdev,
+ const struct sprd_clk_desc *desc)
+{
+ void __iomem *base;
+ struct device_node *node = pdev->dev.of_node;
+ struct regmap *regmap;
+
+ if (of_find_property(node, "sprd,syscon", NULL)) {
+ regmap = syscon_regmap_lookup_by_phandle(node, "sprd,syscon");
+ if (IS_ERR_OR_NULL(regmap)) {
+ pr_err("%s: failed to get syscon regmap\n", __func__);
+ return PTR_ERR(regmap);
+ }
+ } else {
+ base = of_iomap(node, 0);
+ regmap = devm_regmap_init_mmio(&pdev->dev, base,
+ &sprdclk_regmap_config);
+ if (IS_ERR_OR_NULL(regmap)) {
+ pr_err("failed to init regmap\n");
+ return PTR_ERR(regmap);
+ }
+ }
+
+ sprd_clk_set_regmap(desc, regmap);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(sprd_clk_regmap_init);
+
+int sprd_clk_probe(struct device *dev, struct clk_hw_onecell_data *clkhw)
+{
+ int i, ret;
+ struct clk_hw *hw;
+
+ for (i = 0; i < clkhw->num; i++) {
+
+ hw = clkhw->hws[i];
+
+ if (!hw)
+ continue;
+
+ ret = devm_clk_hw_register(dev, hw);
+ if (ret) {
+ dev_err(dev, "Couldn't register clock %d - %s\n",
+ i, hw->init->name);
+ return ret;
+ }
+ }
+
+ ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, clkhw);
+ if (ret)
+ dev_err(dev, "Failed to add clock provider\n");
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(sprd_clk_probe);
+
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/clk/sprd/common.h b/drivers/clk/sprd/common.h
new file mode 100644
index 000000000000..abd9ff5ef448
--- /dev/null
+++ b/drivers/clk/sprd/common.h
@@ -0,0 +1,38 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Spreadtrum clock infrastructure
+//
+// Copyright (C) 2017 Spreadtrum, Inc.
+// Author: Chunyan Zhang <chunyan.zhang@spreadtrum.com>
+
+#ifndef _SPRD_CLK_COMMON_H_
+#define _SPRD_CLK_COMMON_H_
+
+#include <linux/clk-provider.h>
+#include <linux/of_platform.h>
+#include <linux/regmap.h>
+
+struct device_node;
+
+struct sprd_clk_common {
+ struct regmap *regmap;
+ u32 reg;
+ struct clk_hw hw;
+};
+
+struct sprd_clk_desc {
+ struct sprd_clk_common **clk_clks;
+ unsigned long num_clk_clks;
+ struct clk_hw_onecell_data *hw_clks;
+};
+
+static inline struct sprd_clk_common *
+ hw_to_sprd_clk_common(const struct clk_hw *hw)
+{
+ return container_of(hw, struct sprd_clk_common, hw);
+}
+int sprd_clk_regmap_init(struct platform_device *pdev,
+ const struct sprd_clk_desc *desc);
+int sprd_clk_probe(struct device *dev, struct clk_hw_onecell_data *clkhw);
+
+#endif /* _SPRD_CLK_COMMON_H_ */