diff options
author | Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> | 2018-03-26 20:38:57 +0300 |
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committer | Stephen Boyd <sboyd@kernel.org> | 2018-04-07 00:15:23 +0300 |
commit | 3495e29565986aac23efa5d5153e424e15ed2a3c (patch) | |
tree | 18b8f56aa4208baa8844f6f355ca34d3d6416794 | |
parent | 06d42212e69bfa953aec5887c75a1781f27c2a2e (diff) | |
download | linux-3495e29565986aac23efa5d5153e424e15ed2a3c.tar.xz |
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>
-rw-r--r-- | drivers/clk/Kconfig | 1 | ||||
-rw-r--r-- | drivers/clk/Makefile | 1 | ||||
-rw-r--r-- | drivers/clk/actions/Kconfig | 4 | ||||
-rw-r--r-- | drivers/clk/actions/Makefile | 3 | ||||
-rw-r--r-- | drivers/clk/actions/owl-common.c | 89 | ||||
-rw-r--r-- | drivers/clk/actions/owl-common.h | 41 |
6 files changed, 139 insertions, 0 deletions
diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig index 98ce9fc6e6c0..6313a4f4327a 100644 --- 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 71ec41e6364f..b7909df532ed 100644 --- 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-$(CONFIG_ARC_PLAT_AXS10X) += axs10x/ diff --git a/drivers/clk/actions/Kconfig b/drivers/clk/actions/Kconfig new file mode 100644 index 000000000000..13a3e5083d43 --- /dev/null +++ b/drivers/clk/actions/Kconfig @@ -0,0 +1,4 @@ +config CLK_ACTIONS + bool "Clock driver for Actions Semi SoCs" + depends on ARCH_ACTIONS || COMPILE_TEST + default ARCH_ACTIONS diff --git a/drivers/clk/actions/Makefile b/drivers/clk/actions/Makefile new file mode 100644 index 000000000000..64a50fc2d335 --- /dev/null +++ b/drivers/clk/actions/Makefile @@ -0,0 +1,3 @@ +obj-$(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 index 000000000000..61c1071b5180 --- /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 index 000000000000..4fd726ec54a6 --- /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_ */ |