mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-12 13:55:32 +00:00
![Sonic Zhang](/assets/img/avatar_default.png)
Device tree is not enabled in some architecture where gpio driver mcp23s08 is still required. v2-changes: - Parse device tree properties into platform data other than individual variables. v3-changes: - Use of_node in gpio_chip device structure, because the struct device * always has an of_node which is NULL when OF is not used. Signed-off-by: Sonic Zhang <sonic.zhang@analog.com> Reviewed-by: Alexandre Courbot <acourbot@nvidia.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
43 lines
1.7 KiB
C
43 lines
1.7 KiB
C
|
|
/* FIXME driver should be able to handle IRQs... */
|
|
|
|
struct mcp23s08_chip_info {
|
|
bool is_present; /* true if populated */
|
|
unsigned pullups; /* BIT(x) means enable pullup x */
|
|
};
|
|
|
|
struct mcp23s08_platform_data {
|
|
/* For mcp23s08, up to 4 slaves (numbered 0..3) can share one SPI
|
|
* chipselect, each providing 1 gpio_chip instance with 8 gpios.
|
|
* For mpc23s17, up to 8 slaves (numbered 0..7) can share one SPI
|
|
* chipselect, each providing 1 gpio_chip (port A + port B) with
|
|
* 16 gpios.
|
|
*/
|
|
struct mcp23s08_chip_info chip[8];
|
|
|
|
/* "base" is the number of the first GPIO. Dynamic assignment is
|
|
* not currently supported, and even if there are gaps in chip
|
|
* addressing the GPIO numbers are sequential .. so for example
|
|
* if only slaves 0 and 3 are present, their GPIOs range from
|
|
* base to base+15 (or base+31 for s17 variant).
|
|
*/
|
|
unsigned base;
|
|
/* Marks the device as a interrupt controller.
|
|
* NOTE: The interrupt functionality is only supported for i2c
|
|
* versions of the chips. The spi chips can also do the interrupts,
|
|
* but this is not supported by the linux driver yet.
|
|
*/
|
|
bool irq_controller;
|
|
|
|
/* Sets the mirror flag in the IOCON register. Devices
|
|
* with two interrupt outputs (these are the devices ending with 17 and
|
|
* those that have 16 IOs) have two IO banks: IO 0-7 form bank 1 and
|
|
* IO 8-15 are bank 2. These chips have two different interrupt outputs:
|
|
* One for bank 1 and another for bank 2. If irq-mirror is set, both
|
|
* interrupts are generated regardless of the bank that an input change
|
|
* occurred on. If it is not set, the interrupt are only generated for
|
|
* the bank they belong to.
|
|
* On devices with only one interrupt output this property is useless.
|
|
*/
|
|
bool mirror;
|
|
};
|