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Merge branch 'clk-gpio' into clk-next

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* clk-gpio:
  clk: clk-gpio: Request GPIO descriptor as LOW
  clk: clk-gpio: Make GPIO clock provider use descriptors only
This commit is contained in:
Stephen Boyd 2017-11-14 10:07:45 -08:00
commit e8d07fd258
2 changed files with 34 additions and 62 deletions
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84
drivers/clk/clk-gpio.c
View File

@ -15,9 +15,7 @@
#include <linux/clk-provider.h> #include <linux/clk-provider.h>
#include <linux/export.h> #include <linux/export.h>
#include <linux/slab.h> #include <linux/slab.h>
#include <linux/gpio.h>
#include <linux/gpio/consumer.h> #include <linux/gpio/consumer.h>
#include <linux/of_gpio.h>
#include <linux/err.h> #include <linux/err.h>
#include <linux/device.h> #include <linux/device.h>
#include <linux/platform_device.h> #include <linux/platform_device.h>
@ -95,14 +93,12 @@ const struct clk_ops clk_gpio_mux_ops = {
EXPORT_SYMBOL_GPL(clk_gpio_mux_ops); EXPORT_SYMBOL_GPL(clk_gpio_mux_ops);
static struct clk_hw *clk_register_gpio(struct device *dev, const char *name, static struct clk_hw *clk_register_gpio(struct device *dev, const char *name,
const char * const *parent_names, u8 num_parents, unsigned gpio, const char * const *parent_names, u8 num_parents, struct gpio_desc *gpiod,
bool active_low, unsigned long flags, unsigned long flags, const struct clk_ops *clk_gpio_ops)
const struct clk_ops *clk_gpio_ops)
{ {
struct clk_gpio *clk_gpio; struct clk_gpio *clk_gpio;
struct clk_hw *hw; struct clk_hw *hw;
struct clk_init_data init = {}; struct clk_init_data init = {};
unsigned long gpio_flags;
int err; int err;
if (dev) if (dev)
@ -113,32 +109,13 @@ static struct clk_hw *clk_register_gpio(struct device *dev, const char *name,
if (!clk_gpio) if (!clk_gpio)
return ERR_PTR(-ENOMEM); return ERR_PTR(-ENOMEM);
if (active_low)
gpio_flags = GPIOF_ACTIVE_LOW | GPIOF_OUT_INIT_HIGH;
else
gpio_flags = GPIOF_OUT_INIT_LOW;
if (dev)
err = devm_gpio_request_one(dev, gpio, gpio_flags, name);
else
err = gpio_request_one(gpio, gpio_flags, name);
if (err) {
if (err != -EPROBE_DEFER)
pr_err("%s: %s: Error requesting clock control gpio %u\n",
__func__, name, gpio);
if (!dev)
kfree(clk_gpio);
return ERR_PTR(err);
}
init.name = name; init.name = name;
init.ops = clk_gpio_ops; init.ops = clk_gpio_ops;
init.flags = flags | CLK_IS_BASIC; init.flags = flags | CLK_IS_BASIC;
init.parent_names = parent_names; init.parent_names = parent_names;
init.num_parents = num_parents; init.num_parents = num_parents;
clk_gpio->gpiod = gpio_to_desc(gpio); clk_gpio->gpiod = gpiod;
clk_gpio->hw.init = &init; clk_gpio->hw.init = &init;
hw = &clk_gpio->hw; hw = &clk_gpio->hw;
@ -151,7 +128,6 @@ static struct clk_hw *clk_register_gpio(struct device *dev, const char *name,
return hw; return hw;
if (!dev) { if (!dev) {
gpiod_put(clk_gpio->gpiod);
kfree(clk_gpio); kfree(clk_gpio);
} }
@ -164,29 +140,27 @@ static struct clk_hw *clk_register_gpio(struct device *dev, const char *name,
* @dev: device that is registering this clock * @dev: device that is registering this clock
* @name: name of this clock * @name: name of this clock
* @parent_name: name of this clock's parent * @parent_name: name of this clock's parent
* @gpio: gpio number to gate this clock * @gpiod: gpio descriptor to gate this clock
* @active_low: true if gpio should be set to 0 to enable clock
* @flags: clock flags * @flags: clock flags
*/ */
struct clk_hw *clk_hw_register_gpio_gate(struct device *dev, const char *name, struct clk_hw *clk_hw_register_gpio_gate(struct device *dev, const char *name,
const char *parent_name, unsigned gpio, bool active_low, const char *parent_name, struct gpio_desc *gpiod,
unsigned long flags) unsigned long flags)
{ {
return clk_register_gpio(dev, name, return clk_register_gpio(dev, name,
(parent_name ? &parent_name : NULL), (parent_name ? &parent_name : NULL),
(parent_name ? 1 : 0), gpio, active_low, flags, (parent_name ? 1 : 0), gpiod, flags,
&clk_gpio_gate_ops); &clk_gpio_gate_ops);
} }
EXPORT_SYMBOL_GPL(clk_hw_register_gpio_gate); EXPORT_SYMBOL_GPL(clk_hw_register_gpio_gate);
struct clk *clk_register_gpio_gate(struct device *dev, const char *name, struct clk *clk_register_gpio_gate(struct device *dev, const char *name,
const char *parent_name, unsigned gpio, bool active_low, const char *parent_name, struct gpio_desc *gpiod,
unsigned long flags) unsigned long flags)
{ {
struct clk_hw *hw; struct clk_hw *hw;
hw = clk_hw_register_gpio_gate(dev, name, parent_name, gpio, active_low, hw = clk_hw_register_gpio_gate(dev, name, parent_name, gpiod, flags);
flags);
if (IS_ERR(hw)) if (IS_ERR(hw))
return ERR_CAST(hw); return ERR_CAST(hw);
return hw->clk; return hw->clk;
@ -199,13 +173,12 @@ EXPORT_SYMBOL_GPL(clk_register_gpio_gate);
* @name: name of this clock * @name: name of this clock
* @parent_names: names of this clock's parents * @parent_names: names of this clock's parents
* @num_parents: number of parents listed in @parent_names * @num_parents: number of parents listed in @parent_names
* @gpio: gpio number to gate this clock * @gpiod: gpio descriptor to gate this clock
* @active_low: true if gpio should be set to 0 to enable clock
* @flags: clock flags * @flags: clock flags
*/ */
struct clk_hw *clk_hw_register_gpio_mux(struct device *dev, const char *name, struct clk_hw *clk_hw_register_gpio_mux(struct device *dev, const char *name,
const char * const *parent_names, u8 num_parents, unsigned gpio, const char * const *parent_names, u8 num_parents, struct gpio_desc *gpiod,
bool active_low, unsigned long flags) unsigned long flags)
{ {
if (num_parents != 2) { if (num_parents != 2) {
pr_err("mux-clock %s must have 2 parents\n", name); pr_err("mux-clock %s must have 2 parents\n", name);
@ -213,18 +186,18 @@ struct clk_hw *clk_hw_register_gpio_mux(struct device *dev, const char *name,
} }
return clk_register_gpio(dev, name, parent_names, num_parents, return clk_register_gpio(dev, name, parent_names, num_parents,
gpio, active_low, flags, &clk_gpio_mux_ops); gpiod, flags, &clk_gpio_mux_ops);
} }
EXPORT_SYMBOL_GPL(clk_hw_register_gpio_mux); EXPORT_SYMBOL_GPL(clk_hw_register_gpio_mux);
struct clk *clk_register_gpio_mux(struct device *dev, const char *name, struct clk *clk_register_gpio_mux(struct device *dev, const char *name,
const char * const *parent_names, u8 num_parents, unsigned gpio, const char * const *parent_names, u8 num_parents, struct gpio_desc *gpiod,
bool active_low, unsigned long flags) unsigned long flags)
{ {
struct clk_hw *hw; struct clk_hw *hw;
hw = clk_hw_register_gpio_mux(dev, name, parent_names, num_parents, hw = clk_hw_register_gpio_mux(dev, name, parent_names, num_parents,
gpio, active_low, flags); gpiod, flags);
if (IS_ERR(hw)) if (IS_ERR(hw))
return ERR_CAST(hw); return ERR_CAST(hw);
return hw->clk; return hw->clk;
@ -236,10 +209,10 @@ static int gpio_clk_driver_probe(struct platform_device *pdev)
struct device_node *node = pdev->dev.of_node; struct device_node *node = pdev->dev.of_node;
const char **parent_names, *gpio_name; const char **parent_names, *gpio_name;
unsigned int num_parents; unsigned int num_parents;
int gpio; struct gpio_desc *gpiod;
enum of_gpio_flags of_flags;
struct clk *clk; struct clk *clk;
bool active_low, is_mux; bool is_mux;
int ret;
num_parents = of_clk_get_parent_count(node); num_parents = of_clk_get_parent_count(node);
if (num_parents) { if (num_parents) {
@ -255,28 +228,27 @@ static int gpio_clk_driver_probe(struct platform_device *pdev)
is_mux = of_device_is_compatible(node, "gpio-mux-clock"); is_mux = of_device_is_compatible(node, "gpio-mux-clock");
gpio_name = is_mux ? "select-gpios" : "enable-gpios"; gpio_name = is_mux ? "select" : "enable";
gpio = of_get_named_gpio_flags(node, gpio_name, 0, &of_flags); gpiod = devm_gpiod_get(&pdev->dev, gpio_name, GPIOD_OUT_LOW);
if (gpio < 0) { if (IS_ERR(gpiod)) {
if (gpio == -EPROBE_DEFER) ret = PTR_ERR(gpiod);
if (ret == -EPROBE_DEFER)
pr_debug("%s: %s: GPIOs not yet available, retry later\n", pr_debug("%s: %s: GPIOs not yet available, retry later\n",
node->name, __func__); node->name, __func__);
else else
pr_err("%s: %s: Can't get '%s' DT property\n", pr_err("%s: %s: Can't get '%s' named GPIO property\n",
node->name, __func__, node->name, __func__,
gpio_name); gpio_name);
return gpio; return ret;
} }
active_low = of_flags & OF_GPIO_ACTIVE_LOW;
if (is_mux) if (is_mux)
clk = clk_register_gpio_mux(&pdev->dev, node->name, clk = clk_register_gpio_mux(&pdev->dev, node->name,
parent_names, num_parents, gpio, active_low, 0); parent_names, num_parents, gpiod, 0);
else else
clk = clk_register_gpio_gate(&pdev->dev, node->name, clk = clk_register_gpio_gate(&pdev->dev, node->name,
parent_names ? parent_names[0] : NULL, gpio, parent_names ? parent_names[0] : NULL, gpiod,
active_low, 0); 0);
if (IS_ERR(clk)) if (IS_ERR(clk))
return PTR_ERR(clk); return PTR_ERR(clk);

12
include/linux/clk-provider.h
View File

@ -682,10 +682,10 @@ struct clk_gpio {
extern const struct clk_ops clk_gpio_gate_ops; extern const struct clk_ops clk_gpio_gate_ops;
struct clk *clk_register_gpio_gate(struct device *dev, const char *name, struct clk *clk_register_gpio_gate(struct device *dev, const char *name,
const char *parent_name, unsigned gpio, bool active_low, const char *parent_name, struct gpio_desc *gpiod,
unsigned long flags); unsigned long flags);
struct clk_hw *clk_hw_register_gpio_gate(struct device *dev, const char *name, struct clk_hw *clk_hw_register_gpio_gate(struct device *dev, const char *name,
const char *parent_name, unsigned gpio, bool active_low, const char *parent_name, struct gpio_desc *gpiod,
unsigned long flags); unsigned long flags);
void clk_hw_unregister_gpio_gate(struct clk_hw *hw); void clk_hw_unregister_gpio_gate(struct clk_hw *hw);
@ -701,11 +701,11 @@ void clk_hw_unregister_gpio_gate(struct clk_hw *hw);
extern const struct clk_ops clk_gpio_mux_ops; extern const struct clk_ops clk_gpio_mux_ops;
struct clk *clk_register_gpio_mux(struct device *dev, const char *name, struct clk *clk_register_gpio_mux(struct device *dev, const char *name,
const char * const *parent_names, u8 num_parents, unsigned gpio, const char * const *parent_names, u8 num_parents, struct gpio_desc *gpiod,
bool active_low, unsigned long flags); unsigned long flags);
struct clk_hw *clk_hw_register_gpio_mux(struct device *dev, const char *name, struct clk_hw *clk_hw_register_gpio_mux(struct device *dev, const char *name,
const char * const *parent_names, u8 num_parents, unsigned gpio, const char * const *parent_names, u8 num_parents, struct gpio_desc *gpiod,
bool active_low, unsigned long flags); unsigned long flags);
void clk_hw_unregister_gpio_mux(struct clk_hw *hw); void clk_hw_unregister_gpio_mux(struct clk_hw *hw);
/** /**