sysmo-bts
/
barebox
9
0
Fork 0
Code Releases Activity
barebox/include/pinctrl.h

48 lines
1.1 KiB
C
Raw Normal View History

Add initial pinctrl support This is a massively stripped down pinctrl support. The upper API consists of only of: int pinctrl_select_state(struct device_d *dev, const char *state); This is used to setup the pinmux for a device to a certain state. This function normally does not need to be called manually. The device core will setup the default state before probing a device. The pinctrl core has the job of handling the devicetree. It parses the pinctrl phandles for a device from devicetree, finds the correct pinctrl device and calls its set_state callback with the pinctrl setup device node. The simplicity of this pinctrl framework comes from the fact that we: - Limit usage to devicetree only for now. For non devicetree use the old legacy SoC specific APIs still can be used. - Do not parse the devicetree into internal data structures which are used by the drivers later. This adds the overhead that we may parse the devicetree multiple times for more dynamic setups, but on the other hand we do not need to parse devices from the devicetree we don't use in barebox - Do not detect resource conflicts. Since the framework mainly is a devicetree parser this would be hard to implement. It should be easy for board maintainers to avoid resource conflicts though. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
2013-04-21 14:48:47 +00:00
#ifndef PINCTRL_H
#define PINCTRL_H
struct pinctrl_device;
struct pinctrl_ops {
int (*set_state)(struct pinctrl_device *, struct device_node *);
};
struct pinctrl_device {
struct device_d *dev;
struct pinctrl_ops *ops;
struct list_head list;
struct device_node *node;
};
int pinctrl_register(struct pinctrl_device *pdev);
void pinctrl_unregister(struct pinctrl_device *pdev);
#ifdef CONFIG_PINCTRL
int pinctrl_select_state(struct device_d *dev, const char *state);
int pinctrl_select_state_default(struct device_d *dev);
pinctrl: Add functions to select pinctrl from device_node Instead of requiring a device pointer, add a functions to select the pinctrl state based on a device node. The AM33xx cpsw devicetree description has several subdevices with pinctrl information attached to them. In barebox we do not handle the subdevices as distinct devices, so the pinctrl is never configured correctly and the mdio bus subdevice stops working. This patch makes it possible to configure the pinctrl without having a device. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
2013-11-27 09:31:27 +00:00
int of_pinctrl_select_state(struct device_node *np, const char *state);
int of_pinctrl_select_state_default(struct device_node *np);
Add initial pinctrl support This is a massively stripped down pinctrl support. The upper API consists of only of: int pinctrl_select_state(struct device_d *dev, const char *state); This is used to setup the pinmux for a device to a certain state. This function normally does not need to be called manually. The device core will setup the default state before probing a device. The pinctrl core has the job of handling the devicetree. It parses the pinctrl phandles for a device from devicetree, finds the correct pinctrl device and calls its set_state callback with the pinctrl setup device node. The simplicity of this pinctrl framework comes from the fact that we: - Limit usage to devicetree only for now. For non devicetree use the old legacy SoC specific APIs still can be used. - Do not parse the devicetree into internal data structures which are used by the drivers later. This adds the overhead that we may parse the devicetree multiple times for more dynamic setups, but on the other hand we do not need to parse devices from the devicetree we don't use in barebox - Do not detect resource conflicts. Since the framework mainly is a devicetree parser this would be hard to implement. It should be easy for board maintainers to avoid resource conflicts though. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
2013-04-21 14:48:47 +00:00
#else
static inline int pinctrl_select_state(struct device_d *dev, const char *state)
{
return -ENODEV;
}
static inline int pinctrl_select_state_default(struct device_d *dev)
{
return -ENODEV;
}
pinctrl: Add functions to select pinctrl from device_node Instead of requiring a device pointer, add a functions to select the pinctrl state based on a device node. The AM33xx cpsw devicetree description has several subdevices with pinctrl information attached to them. In barebox we do not handle the subdevices as distinct devices, so the pinctrl is never configured correctly and the mdio bus subdevice stops working. This patch makes it possible to configure the pinctrl without having a device. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
2013-11-27 09:31:27 +00:00
static inline int of_pinctrl_select_state(struct device_node *np, const char *state)
{
return -ENODEV;
}
static inline int of_pinctrl_select_state_default(struct device_node *np)
{
return -ENODEV;
}
Add initial pinctrl support This is a massively stripped down pinctrl support. The upper API consists of only of: int pinctrl_select_state(struct device_d *dev, const char *state); This is used to setup the pinmux for a device to a certain state. This function normally does not need to be called manually. The device core will setup the default state before probing a device. The pinctrl core has the job of handling the devicetree. It parses the pinctrl phandles for a device from devicetree, finds the correct pinctrl device and calls its set_state callback with the pinctrl setup device node. The simplicity of this pinctrl framework comes from the fact that we: - Limit usage to devicetree only for now. For non devicetree use the old legacy SoC specific APIs still can be used. - Do not parse the devicetree into internal data structures which are used by the drivers later. This adds the overhead that we may parse the devicetree multiple times for more dynamic setups, but on the other hand we do not need to parse devices from the devicetree we don't use in barebox - Do not detect resource conflicts. Since the framework mainly is a devicetree parser this would be hard to implement. It should be easy for board maintainers to avoid resource conflicts though. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
2013-04-21 14:48:47 +00:00
#endif
#endif /* PINCTRL_H */