opensbi.git/lib/utils/gpio/fdt_gpio.c, branch master

lib: utils/gpio: Use fdt_driver for initialization

2024-11-28T11:59:12Z

FDT gpio drivers have an extra .xlate operation, so they need to embed the `struct fdt_driver` inside the subsystem-specific type. The gpio subsystem always initializes the driver for a specific DT node. Signed-off-by: Samuel Holland Reviewed-by: Anup Patel

treewide: Make carray arrays const and NULL-terminated

2024-11-28T11:39:17Z

This allows the compiler to generate significantly better code, because it does not have to maintain either the loop counter or loop limit. Plus there are half as many symbols to relocate. This also simplifies passing carray arrays to helper functions. Signed-off-by: Samuel Holland Reviewed-by: Anup Patel

lib: utils/gpio: Use FDT node offset as GPIO chip ID

2024-11-05T12:24:39Z

Since the FDT is not modified during driver initialization, node offsets are just as suitable as phandles for use as identifiers: they are stable and unique. With this change, it is no longer necessary to pass the phandle to the driver init functions, so these init functions now use the same prototype as other kinds of drivers. This matches what is already done for I2C adapters. Signed-off-by: Samuel Holland Reviewed-by: Anup Patel

lib: utils/gpio: Remove fdt_gpio_driver() function

2024-11-05T12:24:37Z

This function looks up a chip's driver by matching known drivers against chip->driver, but that is equivalent to using chip->driver directly. Signed-off-by: Samuel Holland Reviewed-by: Anup Patel

lib: utils/gpio: Constify FDT pointers in parsing functions

2024-08-24T07:32:27Z

Indicate that none of these functions modify the devicetree by constifying the parameter type. Signed-off-by: Samuel Holland Reviewed-by: Andrew Jones Reviewed-by: Anup Patel

lib: utils/gpio: Generate FDT gpio driver list at compile-time

2022-05-13T03:57:12Z

Instead of having FDT gpio driver list hard-coded in the C source, we generate it using carray.sh at compile-time. Signed-off-by: Anup Patel Reviewed-by: Atish Patra

lib: utils/gpio: Add minimal SiFive GPIO driver

2021-07-17T08:26:42Z

We add a minimal SiFive GPIO driver so that we can do GPIO based system power-off and reset. Signed-off-by: Green Wan Signed-off-by: Anup Patel Reviewed-by: Atish Patra

lib: utils/gpio: Add simple FDT based GPIO framework

2021-07-17T08:11:17Z

We add a simple FDT based GPIO framework which is built on top of generic GPIO library. The phandle of FDT GPIO chip DT node is treated as unique GPIO chip ID required by the generic GPIO library. The FDT based GPIO chip drivers will be probed on-demand from fdt_gpio_pin_get() called by the GPIO client drivers. Signed-off-by: Anup Patel Reviewed-by: Atish Patra