6 files changed, 143 insertions, 0 deletions

diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
index 1c4e1aa6767e..ce1a32bec8bb 100644
--- a/drivers/clk/Kconfig
+++ b/drivers/clk/Kconfig
@@ -236,6 +236,7 @@ source "drivers/clk/mvebu/Kconfig"
 source "drivers/clk/qcom/Kconfig"
 source "drivers/clk/renesas/Kconfig"
 source "drivers/clk/samsung/Kconfig"
+source "drivers/clk/sprd/Kconfig"
 source "drivers/clk/sunxi-ng/Kconfig"
 source "drivers/clk/tegra/Kconfig"
 source "drivers/clk/ti/Kconfig"
diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index f7f761b02bed..d880d1349c33 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -85,6 +85,7 @@ obj-$(CONFIG_COMMON_CLK_SAMSUNG)	+= samsung/
 obj-$(CONFIG_ARCH_SIRF)                 += sirf/
 obj-$(CONFIG_ARCH_SOCFPGA)              += socfpga/
 obj-$(CONFIG_PLAT_SPEAR)                += spear/
+obj-$(CONFIG_ARCH_SPRD)                 += sprd/
 obj-$(CONFIG_ARCH_STI)                  += st/
 obj-$(CONFIG_ARCH_SUNXI)                += sunxi/
 obj-$(CONFIG_ARCH_SUNXI)                += sunxi-ng/
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_ */