Commit d41f59fd authored by Chunyan Zhang's avatar Chunyan Zhang Committed by Stephen Boyd

clk: sprd: Add common infrastructure

Added Spreadtrum's clock driver framework together with common
structures and interface functions.
Signed-off-by: default avatarChunyan Zhang <chunyan.zhang@spreadtrum.com>
Signed-off-by: default avatarStephen Boyd <sboyd@codeaurora.org>
parent 1ded879e
......@@ -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"
......
......@@ -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/
......
config SPRD_COMMON_CLK
tristate "Clock support for Spreadtrum SoCs"
depends on ARCH_SPRD || COMPILE_TEST
default ARCH_SPRD
obj-$(CONFIG_SPRD_COMMON_CLK) += clk-sprd.o
clk-sprd-y += common.o
// 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");
// 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_ */
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