clk: actions: Add common clock driver support

Add support for Actions Semi common clock driver with generic structures
and interface functions.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
index 98ce9fc..6313a4f 100644 (file)
--- a/drivers/clk/Kconfig
+++ b/drivers/clk/Kconfig
@@ -238,6 +238,7 @@ config COMMON_CLK_VC5
          This driver supports the IDT VersaClock 5 and VersaClock 6
          programmable clock generators.
 
+source "drivers/clk/actions/Kconfig"
 source "drivers/clk/bcm/Kconfig"
 source "drivers/clk/hisilicon/Kconfig"
 source "drivers/clk/imgtec/Kconfig"

diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index 71ec41e..b7909df 100644 (file)
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -56,6 +56,7 @@ obj-$(CONFIG_COMMON_CLK_WM831X)               += clk-wm831x.o
 obj-$(CONFIG_COMMON_CLK_XGENE)         += clk-xgene.o
 
 # please keep this section sorted lexicographically by directory path name
+obj-y                                  += actions/
 obj-$(CONFIG_COMMON_CLK_AT91)          += at91/
 obj-$(CONFIG_ARCH_ARTPEC)              += axis/
 obj-$(CONFIG_ARC_PLAT_AXS10X)          += axs10x/

diff --git a/drivers/clk/actions/Kconfig b/drivers/clk/actions/Kconfig
new file mode 100644 (file)
index 0000000..13a3e50
--- /dev/null
+++ b/drivers/clk/actions/Kconfig
@@ -0,0 +1,4 @@
+config CLK_ACTIONS
+       bool "Clock driver for Actions Semi SoCs"
+       depends on ARCH_ACTIONS || COMPILE_TEST
+       default ARCH_ACTIONS

diff --git a/drivers/clk/actions/Makefile b/drivers/clk/actions/Makefile
new file mode 100644 (file)
index 0000000..64a50fc
--- /dev/null
+++ b/drivers/clk/actions/Makefile
@@ -0,0 +1,3 @@
+obj-$(CONFIG_CLK_ACTIONS)      += clk-owl.o
+
+clk-owl-y                      += owl-common.o

diff --git a/drivers/clk/actions/owl-common.c b/drivers/clk/actions/owl-common.c
new file mode 100644 (file)
index 0000000..61c1071
--- /dev/null
+++ b/drivers/clk/actions/owl-common.c
@@ -0,0 +1,89 @@
+// SPDX-License-Identifier: GPL-2.0+
+//
+// OWL common clock driver
+//
+// Copyright (c) 2014 Actions Semi Inc.
+// Author: David Liu <liuwei@actions-semi.com>
+//
+// Copyright (c) 2018 Linaro Ltd.
+// Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
+
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#include "owl-common.h"
+
+static const struct regmap_config owl_regmap_config = {
+       .reg_bits       = 32,
+       .reg_stride     = 4,
+       .val_bits       = 32,
+       .max_register   = 0x00cc,
+       .fast_io        = true,
+};
+
+static void owl_clk_set_regmap(const struct owl_clk_desc *desc,
+                        struct regmap *regmap)
+{
+       int i;
+       struct owl_clk_common *clks;
+
+       for (i = 0; i < desc->num_clks; i++) {
+               clks = desc->clks[i];
+               if (!clks)
+                       continue;
+
+               clks->regmap = regmap;
+       }
+}
+
+int owl_clk_regmap_init(struct platform_device *pdev,
+                        const struct owl_clk_desc *desc)
+{
+       void __iomem *base;
+       struct regmap *regmap;
+       struct resource *res;
+
+       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       base = devm_ioremap_resource(&pdev->dev, res);
+       if (IS_ERR(base))
+               return PTR_ERR(base);
+
+       regmap = devm_regmap_init_mmio(&pdev->dev, base, &owl_regmap_config);
+       if (IS_ERR(regmap)) {
+               pr_err("failed to init regmap\n");
+               return PTR_ERR(regmap);
+       }
+
+       owl_clk_set_regmap(desc, regmap);
+
+       return 0;
+}
+
+int owl_clk_probe(struct device *dev, struct clk_hw_onecell_data *hw_clks)
+{
+       int i, ret;
+       struct clk_hw *hw;
+
+       for (i = 0; i < hw_clks->num; i++) {
+
+               hw = hw_clks->hws[i];
+
+               if (IS_ERR_OR_NULL(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, hw_clks);
+       if (ret)
+               dev_err(dev, "Failed to add clock provider\n");
+
+       return ret;
+}

diff --git a/drivers/clk/actions/owl-common.h b/drivers/clk/actions/owl-common.h
new file mode 100644 (file)
index 0000000..4fd726e
--- /dev/null
+++ b/drivers/clk/actions/owl-common.h
@@ -0,0 +1,41 @@
+// SPDX-License-Identifier: GPL-2.0+
+//
+// OWL common clock driver
+//
+// Copyright (c) 2014 Actions Semi Inc.
+// Author: David Liu <liuwei@actions-semi.com>
+//
+// Copyright (c) 2018 Linaro Ltd.
+// Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
+
+#ifndef _OWL_COMMON_H_
+#define _OWL_COMMON_H_
+
+#include <linux/clk-provider.h>
+#include <linux/of_platform.h>
+#include <linux/regmap.h>
+
+struct device_node;
+
+struct owl_clk_common {
+       struct regmap                   *regmap;
+       struct clk_hw                   hw;
+};
+
+struct owl_clk_desc {
+       struct owl_clk_common           **clks;
+       unsigned long                   num_clks;
+       struct clk_hw_onecell_data      *hw_clks;
+};
+
+static inline struct owl_clk_common *
+       hw_to_owl_clk_common(const struct clk_hw *hw)
+{
+       return container_of(hw, struct owl_clk_common, hw);
+}
+
+int owl_clk_regmap_init(struct platform_device *pdev,
+                        const struct owl_clk_desc *desc);
+int owl_clk_probe(struct device *dev, struct clk_hw_onecell_data *hw_clks);
+
+#endif /* _OWL_COMMON_H_ */