Re: Usage of generated dts *_GPIO_FLAGS


Erwan Gouriou
 

Hi Diego,


Having direct match between generated FLAGS/INT_CONF aliases and application symbols would be a good idea.
Though not sure which should converge to the other.
INT_CONF (Interrupt configuration I guess) is more restrictive than FLAGS.
Impacted field is used to configure GPIO in general, not interrupt only, so a more generic name might be a better choice.

Erwan


On 4 May 2018 at 07:33, Diego Sueiro <diego.sueiro@...> wrote:
Hello,

I'd like to know what is the usage of the *_GPIO_FLAGS macro.

For example in "dts/bindings/gpio/nxp,kinetis-gpio.yaml" file:

cell_string: GPIO
"#cells":
  - pin
  - flags

And "boards/arm/frdm_k64f/frdm_k64f.dts" file we have
gpios = <&gpioa 4 GPIO_INT_ACTIVE_LOW>;

This will generate in "zephyr/include/generated/generated_dts_board.h":
#define GPIO_KEYS_1_GPIO_CONTROLLER "GPIO_0"
#define GPIO_KEYS_1_GPIO_FLAGS_0    0
#define GPIO_KEYS_1_GPIO_PIN_0      4
#define GPIO_KEYS_1_LABEL       "User SW3"
#define GPIO_KEYS_1_GPIO_FLAGS      GPIO_KEYS_1_GPIO_FLAGS_0
#define GPIO_KEYS_1_GPIO_PIN        GPIO_KEYS_1_GPIO_PIN_0
#define SW0_GPIO_CONTROLLER     GPIO_KEYS_1_GPIO_CONTROLLER
#define SW0_GPIO_FLAGS          GPIO_KEYS_1_GPIO_FLAGS
#define SW0_GPIO_PIN            GPIO_KEYS_1_GPIO_PIN
#define SW0_LABEL           GPIO_KEYS_1_LABEL

In this example SW0_GPIO_FLAGS is not "consumed" by any source code, but  "samples/basic/button/src/main.c" application is using SW0_GPIO_CONTROLLER, SW0_GPIO_PIN and SW0_GPIO_INT_CONF.

I think we should name this gpio dts cell as "int_conf" instead of "flags", this way the dts configuration will be used in the button application, for example.



Regards,

--
*dS
Diego Sueiro

CEO do Embarcados
www.embarcados.com.br

/*long live rock 'n roll*/


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