blob: d1bbee19ed0fcf74edfb2019fc4907ba00533a66 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0
/*
* Clock driver for DA8xx/AM17xx/AM18xx/OMAP-L13x CFGCHIP
*
* Copyright (C) 2018 David Lechner <david@lechnology.com>
*/
#include <linux/clk-provider.h>
#include <linux/clk.h>
#include <linux/clkdev.h>
#include <linux/init.h>
#include <linux/mfd/da8xx-cfgchip.h>
#include <linux/mfd/syscon.h>
#include <linux/of_device.h>
#include <linux/of.h>
#include <linux/platform_data/clk-da8xx-cfgchip.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>
/* --- Gate clocks --- */
#define DA8XX_GATE_CLOCK_IS_DIV4P5 BIT(1)
struct da8xx_cfgchip_gate_clk_info {
const char *name;
u32 cfgchip;
u32 bit;
u32 flags;
};
struct da8xx_cfgchip_gate_clk {
struct clk_hw hw;
struct regmap *regmap;
u32 reg;
u32 mask;
};
#define to_da8xx_cfgchip_gate_clk(_hw) \
container_of((_hw), struct da8xx_cfgchip_gate_clk, hw)
static int da8xx_cfgchip_gate_clk_enable(struct clk_hw *hw)
{
struct da8xx_cfgchip_gate_clk *clk = to_da8xx_cfgchip_gate_clk(hw);
return regmap_write_bits(clk->regmap, clk->reg, clk->mask, clk->mask);
}
static void da8xx_cfgchip_gate_clk_disable(struct clk_hw *hw)
{
struct da8xx_cfgchip_gate_clk *clk = to_da8xx_cfgchip_gate_clk(hw);
regmap_write_bits(clk->regmap, clk->reg, clk->mask, 0);
}
static int da8xx_cfgchip_gate_clk_is_enabled(struct clk_hw *hw)
{
struct da8xx_cfgchip_gate_clk *clk = to_da8xx_cfgchip_gate_clk(hw);
unsigned int val;
regmap_read(clk->regmap, clk->reg, &val);
return !!(val & clk->mask);
}
static unsigned long da8xx_cfgchip_div4p5_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
/* this clock divides by 4.5 */
return parent_rate * 2 / 9;
}
static const struct clk_ops da8xx_cfgchip_gate_clk_ops = {
.enable = da8xx_cfgchip_gate_clk_enable,
.disable = da8xx_cfgchip_gate_clk_disable,
.is_enabled = da8xx_cfgchip_gate_clk_is_enabled,
};
static const struct clk_ops da8xx_cfgchip_div4p5_clk_ops = {
.enable = da8xx_cfgchip_gate_clk_enable,
.disable = da8xx_cfgchip_gate_clk_disable,
.is_enabled = da8xx_cfgchip_gate_clk_is_enabled,
.recalc_rate = da8xx_cfgchip_div4p5_recalc_rate,
};
static struct da8xx_cfgchip_gate_clk * __init
da8xx_cfgchip_gate_clk_register(struct device *dev,
const struct da8xx_cfgchip_gate_clk_info *info,
struct regmap *regmap)
{
struct clk *parent;
const char *parent_name;
struct da8xx_cfgchip_gate_clk *gate;
struct clk_init_data init;
int ret;
parent = devm_clk_get(dev, NULL);
if (IS_ERR(parent))
return ERR_CAST(parent);
parent_name = __clk_get_name(parent);
gate = devm_kzalloc(dev, sizeof(*gate), GFP_KERNEL);
if (!gate)
return ERR_PTR(-ENOMEM);
init.name = info->name;
if (info->flags & DA8XX_GATE_CLOCK_IS_DIV4P5)
init.ops = &da8xx_cfgchip_div4p5_clk_ops;
else
init.ops = &da8xx_cfgchip_gate_clk_ops;
init.parent_names = &parent_name;
init.num_parents = 1;
init.flags = 0;
gate->hw.init = &init;
gate->regmap = regmap;
gate->reg = info->cfgchip;
gate->mask = info->bit;
ret = devm_clk_hw_register(dev, &gate->hw);
if (ret < 0)
return ERR_PTR(ret);
return gate;
}
static const struct da8xx_cfgchip_gate_clk_info da8xx_tbclksync_info __initconst = {
.name = "ehrpwm_tbclk",
.cfgchip = CFGCHIP(1),
.bit = CFGCHIP1_TBCLKSYNC,
};
static int __init da8xx_cfgchip_register_tbclk(struct device *dev,
struct regmap *regmap)
{
struct da8xx_cfgchip_gate_clk *gate;
gate = da8xx_cfgchip_gate_clk_register(dev, &da8xx_tbclksync_info,
regmap);
if (IS_ERR(gate))
return PTR_ERR(gate);
clk_hw_register_clkdev(&gate->hw, "tbclk", "ehrpwm.0");
clk_hw_register_clkdev(&gate->hw, "tbclk", "ehrpwm.1");
return 0;
}
static const struct da8xx_cfgchip_gate_clk_info da8xx_div4p5ena_info __initconst = {
.name = "div4.5",
.cfgchip = CFGCHIP(3),
.bit = CFGCHIP3_DIV45PENA,
.flags = DA8XX_GATE_CLOCK_IS_DIV4P5,
};
static int __init da8xx_cfgchip_register_div4p5(struct device *dev,
struct regmap *regmap)
{
struct da8xx_cfgchip_gate_clk *gate;
gate = da8xx_cfgchip_gate_clk_register(dev, &da8xx_div4p5ena_info, regmap);
if (IS_ERR(gate))
return PTR_ERR(gate);
return 0;
}
static int __init
of_da8xx_cfgchip_gate_clk_init(struct device *dev,
const struct da8xx_cfgchip_gate_clk_info *info,
struct regmap *regmap)
{
struct da8xx_cfgchip_gate_clk *gate;
gate = da8xx_cfgchip_gate_clk_register(dev, info, regmap);
if (IS_ERR(gate))
return PTR_ERR(gate);
return devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get, gate);
}
static int __init of_da8xx_tbclksync_init(struct device *dev,
struct regmap *regmap)
{
return of_da8xx_cfgchip_gate_clk_init(dev, &da8xx_tbclksync_info, regmap);
}
static int __init of_da8xx_div4p5ena_init(struct device *dev,
struct regmap *regmap)
{
return of_da8xx_cfgchip_gate_clk_init(dev, &da8xx_div4p5ena_info, regmap);
}
/* --- MUX clocks --- */
struct da8xx_cfgchip_mux_clk_info {
const char *name;
const char *parent0;
const char *parent1;
u32 cfgchip;
u32 bit;
};
struct da8xx_cfgchip_mux_clk {
struct clk_hw hw;
struct regmap *regmap;
u32 reg;
u32 mask;
};
#define to_da8xx_cfgchip_mux_clk(_hw) \
container_of((_hw), struct da8xx_cfgchip_mux_clk, hw)
static int da8xx_cfgchip_mux_clk_set_parent(struct clk_hw *hw, u8 index)
{
struct da8xx_cfgchip_mux_clk *clk = to_da8xx_cfgchip_mux_clk(hw);
unsigned int val = index ? clk->mask : 0;
return regmap_write_bits(clk->regmap, clk->reg, clk->mask, val);
}
static u8 da8xx_cfgchip_mux_clk_get_parent(struct clk_hw *hw)
{
struct da8xx_cfgchip_mux_clk *clk = to_da8xx_cfgchip_mux_clk(hw);
unsigned int val;
regmap_read(clk->regmap, clk->reg, &val);
return (val & clk->mask) ? 1 : 0;
}
static const struct clk_ops da8xx_cfgchip_mux_clk_ops = {
.set_parent = da8xx_cfgchip_mux_clk_set_parent,
.get_parent = da8xx_cfgchip_mux_clk_get_parent,
};
static struct da8xx_cfgchip_mux_clk * __init
da8xx_cfgchip_mux_clk_register(struct device *dev,
const struct da8xx_cfgchip_mux_clk_info *info,
struct regmap *regmap)
{
const char * const parent_names[] = { info->parent0, info->parent1 };
struct da8xx_cfgchip_mux_clk *mux;
struct clk_init_data init;
int ret;
mux = devm_kzalloc(dev, sizeof(*mux), GFP_KERNEL);
if (!mux)
return ERR_PTR(-ENOMEM);
init.name = info->name;
init.ops = &da8xx_cfgchip_mux_clk_ops;
init.parent_names = parent_names;
init.num_parents = 2;
init.flags = 0;
mux->hw.init = &init;
mux->regmap = regmap;
mux->reg = info->cfgchip;
mux->mask = info->bit;
ret = devm_clk_hw_register(dev, &mux->hw);
if (ret < 0)
return ERR_PTR(ret);
return mux;
}
static const struct da8xx_cfgchip_mux_clk_info da850_async1_info __initconst = {
.name = "async1",
.parent0 = "pll0_sysclk3",
.parent1 = "div4.5",
.cfgchip = CFGCHIP(3),
.bit = CFGCHIP3_EMA_CLKSRC,
};
static int __init da8xx_cfgchip_register_async1(struct device *dev,
struct regmap *regmap)
{
struct da8xx_cfgchip_mux_clk *mux;
mux = da8xx_cfgchip_mux_clk_register(dev, &da850_async1_info, regmap);
if (IS_ERR(mux))
return PTR_ERR(mux);
clk_hw_register_clkdev(&mux->hw, "async1", "da850-psc0");
return 0;
}
static const struct da8xx_cfgchip_mux_clk_info da850_async3_info __initconst = {
.name = "async3",
.parent0 = "pll0_sysclk2",
.parent1 = "pll1_sysclk2",
.cfgchip = CFGCHIP(3),
.bit = CFGCHIP3_ASYNC3_CLKSRC,
};
static int __init da850_cfgchip_register_async3(struct device *dev,
struct regmap *regmap)
{
struct da8xx_cfgchip_mux_clk *mux;
struct clk_hw *parent;
mux = da8xx_cfgchip_mux_clk_register(dev, &da850_async3_info, regmap);
if (IS_ERR(mux))
return PTR_ERR(mux);
clk_hw_register_clkdev(&mux->hw, "async3", "da850-psc1");
/* pll1_sysclk2 is not affected by CPU scaling, so use it for async3 */
parent = clk_hw_get_parent_by_index(&mux->hw, 1);
if (parent)
clk_set_parent(mux->hw.clk, parent->clk);
else
dev_warn(dev, "Failed to find async3 parent clock\n");
return 0;
}
static int __init
of_da8xx_cfgchip_init_mux_clock(struct device *dev,
const struct da8xx_cfgchip_mux_clk_info *info,
struct regmap *regmap)
{
struct da8xx_cfgchip_mux_clk *mux;
mux = da8xx_cfgchip_mux_clk_register(dev, info, regmap);
if (IS_ERR(mux))
return PTR_ERR(mux);
return devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get, &mux->hw);
}
static int __init of_da850_async1_init(struct device *dev, struct regmap *regmap)
{
return of_da8xx_cfgchip_init_mux_clock(dev, &da850_async1_info, regmap);
}
static int __init of_da850_async3_init(struct device *dev, struct regmap *regmap)
{
return of_da8xx_cfgchip_init_mux_clock(dev, &da850_async3_info, regmap);
}
/* --- USB 2.0 PHY clock --- */
struct da8xx_usb0_clk48 {
struct clk_hw hw;
struct clk *fck;
struct regmap *regmap;
};
#define to_da8xx_usb0_clk48(_hw) \
container_of((_hw), struct da8xx_usb0_clk48, hw)
static int da8xx_usb0_clk48_prepare(struct clk_hw *hw)
{
struct da8xx_usb0_clk48 *usb0 = to_da8xx_usb0_clk48(hw);
/* The USB 2.0 PSC clock is only needed temporarily during the USB 2.0
* PHY clock enable, but since clk_prepare() can't be called in an
* atomic context (i.e. in clk_enable()), we have to prepare it here.
*/
return clk_prepare(usb0->fck);
}
static void da8xx_usb0_clk48_unprepare(struct clk_hw *hw)
{
struct da8xx_usb0_clk48 *usb0 = to_da8xx_usb0_clk48(hw);
clk_unprepare(usb0->fck);
}
static int da8xx_usb0_clk48_enable(struct clk_hw *hw)
{
struct da8xx_usb0_clk48 *usb0 = to_da8xx_usb0_clk48(hw);
unsigned int mask, val;
int ret;
/* Locking the USB 2.O PLL requires that the USB 2.O PSC is enabled
* temporaily. It can be turned back off once the PLL is locked.
*/
clk_enable(usb0->fck);
/* Turn on the USB 2.0 PHY, but just the PLL, and not OTG. The USB 1.1
* PHY may use the USB 2.0 PLL clock without USB 2.0 OTG being used.
*/
mask = CFGCHIP2_RESET | CFGCHIP2_PHYPWRDN | CFGCHIP2_PHY_PLLON;
val = CFGCHIP2_PHY_PLLON;
regmap_write_bits(usb0->regmap, CFGCHIP(2), mask, val);
ret = regmap_read_poll_timeout(usb0->regmap, CFGCHIP(2), val,
val & CFGCHIP2_PHYCLKGD, 0, 500000);
clk_disable(usb0->fck);
return ret;
}
static void da8xx_usb0_clk48_disable(struct clk_hw *hw)
{
struct da8xx_usb0_clk48 *usb0 = to_da8xx_usb0_clk48(hw);
unsigned int val;
val = CFGCHIP2_PHYPWRDN;
regmap_write_bits(usb0->regmap, CFGCHIP(2), val, val);
}
static int da8xx_usb0_clk48_is_enabled(struct clk_hw *hw)
{
struct da8xx_usb0_clk48 *usb0 = to_da8xx_usb0_clk48(hw);
unsigned int val;
regmap_read(usb0->regmap, CFGCHIP(2), &val);
return !!(val & CFGCHIP2_PHYCLKGD);
}
static unsigned long da8xx_usb0_clk48_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct da8xx_usb0_clk48 *usb0 = to_da8xx_usb0_clk48(hw);
unsigned int mask, val;
/* The parent clock rate must be one of the following */
mask = CFGCHIP2_REFFREQ_MASK;
switch (parent_rate) {
case 12000000:
val = CFGCHIP2_REFFREQ_12MHZ;
break;
case 13000000:
val = CFGCHIP2_REFFREQ_13MHZ;
break;
case 19200000:
val = CFGCHIP2_REFFREQ_19_2MHZ;
break;
case 20000000:
val = CFGCHIP2_REFFREQ_20MHZ;
break;
case 24000000:
val = CFGCHIP2_REFFREQ_24MHZ;
break;
case 26000000:
val = CFGCHIP2_REFFREQ_26MHZ;
break;
case 38400000:
val = CFGCHIP2_REFFREQ_38_4MHZ;
break;
case 40000000:
val = CFGCHIP2_REFFREQ_40MHZ;
break;
case 48000000:
val = CFGCHIP2_REFFREQ_48MHZ;
break;
default:
return 0;
}
regmap_write_bits(usb0->regmap, CFGCHIP(2), mask, val);
/* USB 2.0 PLL always supplies 48MHz */
return 48000000;
}
static long da8xx_usb0_clk48_round_rate(struct clk_hw *hw, unsigned long rate,
unsigned long *parent_rate)
{
return 48000000;
}
static int da8xx_usb0_clk48_set_parent(struct clk_hw *hw, u8 index)
{
struct da8xx_usb0_clk48 *usb0 = to_da8xx_usb0_clk48(hw);
return regmap_write_bits(usb0->regmap, CFGCHIP(2),
CFGCHIP2_USB2PHYCLKMUX,
index ? CFGCHIP2_USB2PHYCLKMUX : 0);
}
static u8 da8xx_usb0_clk48_get_parent(struct clk_hw *hw)
{
struct da8xx_usb0_clk48 *usb0 = to_da8xx_usb0_clk48(hw);
unsigned int val;
regmap_read(usb0->regmap, CFGCHIP(2), &val);
return (val & CFGCHIP2_USB2PHYCLKMUX) ? 1 : 0;
}
static const struct clk_ops da8xx_usb0_clk48_ops = {
.prepare = da8xx_usb0_clk48_prepare,
.unprepare = da8xx_usb0_clk48_unprepare,
.enable = da8xx_usb0_clk48_enable,
.disable = da8xx_usb0_clk48_disable,
.is_enabled = da8xx_usb0_clk48_is_enabled,
.recalc_rate = da8xx_usb0_clk48_recalc_rate,
.round_rate = da8xx_usb0_clk48_round_rate,
.set_parent = da8xx_usb0_clk48_set_parent,
.get_parent = da8xx_usb0_clk48_get_parent,
};
static struct da8xx_usb0_clk48 *
da8xx_cfgchip_register_usb0_clk48(struct device *dev,
struct regmap *regmap)
{
const char * const parent_names[] = { "usb_refclkin", "pll0_auxclk" };
struct clk *fck_clk;
struct da8xx_usb0_clk48 *usb0;
struct clk_init_data init;
int ret;
fck_clk = devm_clk_get(dev, "fck");
if (IS_ERR(fck_clk)) {
if (PTR_ERR(fck_clk) != -EPROBE_DEFER)
dev_err(dev, "Missing fck clock\n");
return ERR_CAST(fck_clk);
}
usb0 = devm_kzalloc(dev, sizeof(*usb0), GFP_KERNEL);
if (!usb0)
return ERR_PTR(-ENOMEM);
init.name = "usb0_clk48";
init.ops = &da8xx_usb0_clk48_ops;
init.parent_names = parent_names;
init.num_parents = 2;
usb0->hw.init = &init;
usb0->fck = fck_clk;
usb0->regmap = regmap;
ret = devm_clk_hw_register(dev, &usb0->hw);
if (ret < 0)
return ERR_PTR(ret);
return usb0;
}
/* --- USB 1.1 PHY clock --- */
struct da8xx_usb1_clk48 {
struct clk_hw hw;
struct regmap *regmap;
};
#define to_da8xx_usb1_clk48(_hw) \
container_of((_hw), struct da8xx_usb1_clk48, hw)
static int da8xx_usb1_clk48_set_parent(struct clk_hw *hw, u8 index)
{
struct da8xx_usb1_clk48 *usb1 = to_da8xx_usb1_clk48(hw);
return regmap_write_bits(usb1->regmap, CFGCHIP(2),
CFGCHIP2_USB1PHYCLKMUX,
index ? CFGCHIP2_USB1PHYCLKMUX : 0);
}
static u8 da8xx_usb1_clk48_get_parent(struct clk_hw *hw)
{
struct da8xx_usb1_clk48 *usb1 = to_da8xx_usb1_clk48(hw);
unsigned int val;
regmap_read(usb1->regmap, CFGCHIP(2), &val);
return (val & CFGCHIP2_USB1PHYCLKMUX) ? 1 : 0;
}
static const struct clk_ops da8xx_usb1_clk48_ops = {
.set_parent = da8xx_usb1_clk48_set_parent,
.get_parent = da8xx_usb1_clk48_get_parent,
};
/**
* da8xx_cfgchip_register_usb1_clk48 - Register a new USB 1.1 PHY clock
* @regmap: The CFGCHIP regmap
*/
static struct da8xx_usb1_clk48 *
da8xx_cfgchip_register_usb1_clk48(struct device *dev,
struct regmap *regmap)
{
const char * const parent_names[] = { "usb0_clk48", "usb_refclkin" };
struct da8xx_usb1_clk48 *usb1;
struct clk_init_data init;
int ret;
usb1 = devm_kzalloc(dev, sizeof(*usb1), GFP_KERNEL);
if (!usb1)
return ERR_PTR(-ENOMEM);
init.name = "usb1_clk48";
init.ops = &da8xx_usb1_clk48_ops;
init.parent_names = parent_names;
init.num_parents = 2;
usb1->hw.init = &init;
usb1->regmap = regmap;
ret = devm_clk_hw_register(dev, &usb1->hw);
if (ret < 0)
return ERR_PTR(ret);
return usb1;
}
static int da8xx_cfgchip_register_usb_phy_clk(struct device *dev,
struct regmap *regmap)
{
struct da8xx_usb0_clk48 *usb0;
struct da8xx_usb1_clk48 *usb1;
struct clk_hw *parent;
usb0 = da8xx_cfgchip_register_usb0_clk48(dev, regmap);
if (IS_ERR(usb0))
return PTR_ERR(usb0);
/*
* All existing boards use pll0_auxclk as the parent and new boards
* should use device tree, so hard-coding the value (1) here.
*/
parent = clk_hw_get_parent_by_index(&usb0->hw, 1);
if (parent)
clk_set_parent(usb0->hw.clk, parent->clk);
else
dev_warn(dev, "Failed to find usb0 parent clock\n");
usb1 = da8xx_cfgchip_register_usb1_clk48(dev, regmap);
if (IS_ERR(usb1))
return PTR_ERR(usb1);
/*
* All existing boards use usb0_clk48 as the parent and new boards
* should use device tree, so hard-coding the value (0) here.
*/
parent = clk_hw_get_parent_by_index(&usb1->hw, 0);
if (parent)
clk_set_parent(usb1->hw.clk, parent->clk);
else
dev_warn(dev, "Failed to find usb1 parent clock\n");
clk_hw_register_clkdev(&usb0->hw, "usb0_clk48", "da8xx-usb-phy");
clk_hw_register_clkdev(&usb1->hw, "usb1_clk48", "da8xx-usb-phy");
return 0;
}
static int of_da8xx_usb_phy_clk_init(struct device *dev, struct regmap *regmap)
{
struct clk_hw_onecell_data *clk_data;
struct da8xx_usb0_clk48 *usb0;
struct da8xx_usb1_clk48 *usb1;
clk_data = devm_kzalloc(dev, struct_size(clk_data, hws, 2),
GFP_KERNEL);
if (!clk_data)
return -ENOMEM;
clk_data->num = 2;
usb0 = da8xx_cfgchip_register_usb0_clk48(dev, regmap);
if (IS_ERR(usb0)) {
if (PTR_ERR(usb0) == -EPROBE_DEFER)
return -EPROBE_DEFER;
dev_warn(dev, "Failed to register usb0_clk48 (%ld)\n",
PTR_ERR(usb0));
clk_data->hws[0] = ERR_PTR(-ENOENT);
} else {
clk_data->hws[0] = &usb0->hw;
}
usb1 = da8xx_cfgchip_register_usb1_clk48(dev, regmap);
if (IS_ERR(usb1)) {
if (PTR_ERR(usb1) == -EPROBE_DEFER)
return -EPROBE_DEFER;
dev_warn(dev, "Failed to register usb1_clk48 (%ld)\n",
PTR_ERR(usb1));
clk_data->hws[1] = ERR_PTR(-ENOENT);
} else {
clk_data->hws[1] = &usb1->hw;
}
return devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, clk_data);
}
/* --- platform device --- */
static const struct of_device_id da8xx_cfgchip_of_match[] = {
{
.compatible = "ti,da830-tbclksync",
.data = of_da8xx_tbclksync_init,
},
{
.compatible = "ti,da830-div4p5ena",
.data = of_da8xx_div4p5ena_init,
},
{
.compatible = "ti,da850-async1-clksrc",
.data = of_da850_async1_init,
},
{
.compatible = "ti,da850-async3-clksrc",
.data = of_da850_async3_init,
},
{
.compatible = "ti,da830-usb-phy-clocks",
.data = of_da8xx_usb_phy_clk_init,
},
{ }
};
static const struct platform_device_id da8xx_cfgchip_id_table[] = {
{
.name = "da830-tbclksync",
.driver_data = (kernel_ulong_t)da8xx_cfgchip_register_tbclk,
},
{
.name = "da830-div4p5ena",
.driver_data = (kernel_ulong_t)da8xx_cfgchip_register_div4p5,
},
{
.name = "da850-async1-clksrc",
.driver_data = (kernel_ulong_t)da8xx_cfgchip_register_async1,
},
{
.name = "da850-async3-clksrc",
.driver_data = (kernel_ulong_t)da850_cfgchip_register_async3,
},
{
.name = "da830-usb-phy-clks",
.driver_data = (kernel_ulong_t)da8xx_cfgchip_register_usb_phy_clk,
},
{ }
};
typedef int (*da8xx_cfgchip_init)(struct device *dev, struct regmap *regmap);
static int da8xx_cfgchip_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct da8xx_cfgchip_clk_platform_data *pdata = dev->platform_data;
const struct of_device_id *of_id;
da8xx_cfgchip_init clk_init = NULL;
struct regmap *regmap = NULL;
of_id = of_match_device(da8xx_cfgchip_of_match, dev);
if (of_id) {
struct device_node *parent;
clk_init = of_id->data;
parent = of_get_parent(dev->of_node);
regmap = syscon_node_to_regmap(parent);
of_node_put(parent);
} else if (pdev->id_entry && pdata) {
clk_init = (void *)pdev->id_entry->driver_data;
regmap = pdata->cfgchip;
}
if (!clk_init) {
dev_err(dev, "unable to find driver data\n");
return -EINVAL;
}
if (IS_ERR_OR_NULL(regmap)) {
dev_err(dev, "no regmap for CFGCHIP syscon\n");
return regmap ? PTR_ERR(regmap) : -ENOENT;
}
return clk_init(dev, regmap);
}
static struct platform_driver da8xx_cfgchip_driver = {
.probe = da8xx_cfgchip_probe,
.driver = {
.name = "da8xx-cfgchip-clk",
.of_match_table = da8xx_cfgchip_of_match,
},
.id_table = da8xx_cfgchip_id_table,
};
static int __init da8xx_cfgchip_driver_init(void)
{
return platform_driver_register(&da8xx_cfgchip_driver);
}
/* has to be postcore_initcall because PSC devices depend on the async3 clock */
postcore_initcall(da8xx_cfgchip_driver_init);