u-boot/drivers/pinctrl/Kconfig
Peng Fan 745df68d36 pinctrl: imx: Introduce pinctrl driver for i.MX6
Introduce pinctrl for i.MX6
1. pinctrl-imx.c is for common usage. It's used by i.MX6/7.
2. Add PINCTRL_IMX PINCTRL_IMX6 Kconfig entry.
3. To the pinctrl_ops implementation, only set_state is implemented.
   To i.MX6/7, the pinctrl dts entry is as following:
&iomuxc {
        pinctrl-names = "default";

        pinctrl_csi1: csi1grp {
                fsl,pins = <
                MX6UL_PAD_CSI_MCLK__CSI_MCLK            0x1b088
                MX6UL_PAD_CSI_PIXCLK__CSI_PIXCLK        0x1b088
                MX6UL_PAD_CSI_VSYNC__CSI_VSYNC          0x1b088
                >;
        };

        [.....]
};
  there is no property named function or groups. So pinctrl_generic_set_state
  can not be used here.
5. This driver is a simple implementation for i.mx iomux controller,
   only parse the fsl,pins property and write value to registers.
6. With DEBUG enabled, we can see log when "i2c bus 0":
   "
   set_state_simple op missing
   imx_pinctrl_set_state: i2c1grp
   mux_reg 0x14c, conf_reg 0x3bc, input_reg 0x5d8, mux_mode 0x0, input_val 0x1, config_val 0x4000007f
   write mux: offset 0x14c val 0x10
   select_input: offset 0x5d8 val 0x1
   write config: offset 0x3bc val 0x7f
   mux_reg 0x148, conf_reg 0x3b8, input_reg 0x5d4, mux_mode 0x0, input_val 0x1, config_val 0x4000007f
   write mux: offset 0x148 val 0x10
   select_input: offset 0x5d4 val 0x1
   write config: offset 0x3b8 val 0x7f
   "
   this means imx6 pinctrl driver works as expected.

Signed-off-by: Peng Fan <van.freenix@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2016-02-21 11:23:48 +01:00

149 lines
4.9 KiB
Text

#
# PINCTRL infrastructure and drivers
#
menu "Pin controllers"
config PINCTRL
bool "Support pin controllers"
depends on DM
help
This enables the basic support for pinctrl framework. You may want
to enable some more options depending on what you want to do.
config PINCTRL_FULL
bool "Support full pin controllers"
depends on PINCTRL && OF_CONTROL
default y
help
This provides Linux-compatible device tree interface for the pinctrl
subsystem. This feature depends on device tree configuration because
it parses a device tree to look for the pinctrl device which the
peripheral device is associated with.
If this option is disabled (it is the only possible choice for non-DT
boards), the pinctrl core provides no systematic mechanism for
identifying peripheral devices, applying needed pinctrl settings.
It is totally up to the implementation of each low-level driver.
You can save memory footprint in return for some limitations.
config PINCTRL_GENERIC
bool "Support generic pin controllers"
depends on PINCTRL_FULL
default y
help
Say Y here if you want to use the pinctrl subsystem through the
generic DT interface. If enabled, some functions become available
to parse common properties such as "pins", "groups", "functions" and
some pin configuration parameters. It would be easier if you only
need the generic DT interface for pin muxing and pin configuration.
If you need to handle vendor-specific DT properties, you can disable
this option and implement your own set_state callback in the pinctrl
operations.
config PINMUX
bool "Support pin multiplexing controllers"
depends on PINCTRL_GENERIC
default y
help
This option enables pin multiplexing through the generic pinctrl
framework. Most SoCs have their own own multiplexing arrangement
where a single pin can be used for several functions. An SoC pinctrl
driver allows the required function to be selected for each pin.
The driver is typically controlled by the device tree.
config PINCONF
bool "Support pin configuration controllers"
depends on PINCTRL_GENERIC
help
This option enables pin configuration through the generic pinctrl
framework.
config SPL_PINCTRL
bool "Support pin controlloers in SPL"
depends on SPL && SPL_DM
help
This option is an SPL-variant of the PINCTRL option.
See the help of PINCTRL for details.
config SPL_PINCTRL_FULL
bool "Support full pin controllers in SPL"
depends on SPL_PINCTRL && SPL_OF_CONTROL
default y
help
This option is an SPL-variant of the PINCTRL_FULL option.
See the help of PINCTRL_FULL for details.
config SPL_PINCTRL_GENERIC
bool "Support generic pin controllers in SPL"
depends on SPL_PINCTRL_FULL
default y
help
This option is an SPL-variant of the PINCTRL_GENERIC option.
See the help of PINCTRL_GENERIC for details.
config SPL_PINMUX
bool "Support pin multiplexing controllers in SPL"
depends on SPL_PINCTRL_GENERIC
default y
help
This option is an SPL-variant of the PINMUX option.
See the help of PINMUX for details.
The pinctrl subsystem can add a substantial overhead to the SPL
image since it typically requires quite a few tables either in the
driver or in the device tree. If this is acceptable and you need
to adjust pin multiplexing in SPL in order to boot into U-Boot,
enable this option. You will need to enable device tree in SPL
for this to work.
config SPL_PINCONF
bool "Support pin configuration controllers in SPL"
depends on SPL_PINCTRL_GENERIC
help
This option is an SPL-variant of the PINCONF option.
See the help of PINCONF for details.
if PINCTRL || SPL_PINCTRL
config ROCKCHIP_PINCTRL
bool "Rockchip pin control driver"
depends on DM
help
Support pin multiplexing control on Rockchip SoCs. The driver is
controlled by a device tree node which contains both the GPIO
definitions and pin control functions for each available multiplex
function.
config ROCKCHIP_3036_PINCTRL
bool "Rockchip rk3036 pin control driver"
depends on DM
help
Support pin multiplexing control on Rockchip rk3036 SoCs. The driver is
controlled by a device tree node which contains both the GPIO
definitions and pin control functions for each available multiplex
function.
config PINCTRL_SANDBOX
bool "Sandbox pinctrl driver"
depends on SANDBOX
help
This enables pinctrl driver for sandbox. Currently, this driver
actually does nothing but print debug messages when pinctrl
operations are invoked.
config PIC32_PINCTRL
bool "Microchip PIC32 pin-control and pin-mux driver"
depends on DM && MACH_PIC32
default y
help
Supports individual pin selection and configuration for each remappable
peripheral available on Microchip PIC32 SoCs. This driver is controlled
by a device tree node which contains both GPIO defintion and pin control
functions.
endif
source "drivers/pinctrl/nxp/Kconfig"
source "drivers/pinctrl/uniphier/Kconfig"
endmenu