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gpio: add gpio-hog support

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add gpio-hog support. GPIO hogging is a mechanism
providing automatic GPIO request and configuration
as part of the gpio-controller's driver probe function.

for more infos see:
doc/device-tree-bindings/gpio/gpio.txt

Signed-off-by: Heiko Schocher <hs@denx.de>
Tested-by: Michal Simek <michal.simek@xilinx.com> (zcu102)
Tested-by: Patrick Delaunay <patrick.delaunay@st.com>
This commit is contained in:
Heiko Schocher
2019-06-12 06:11:46 +02:00
committed by Tom Rini
parent 42f1539727
commit 5fc7cf8c8e
5 changed files with 268 additions and 16 deletions
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6
common/board_r.c
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@@ -49,6 +49,9 @@
#include <linux/err.h>
#include <efi_loader.h>
#include <wdt.h>
#if defined(CONFIG_DM_GPIO_HOG)
#include <asm/gpio.h>
#endif
DECLARE_GLOBAL_DATA_PTR;
@@ -796,6 +799,9 @@ static init_fnc_t init_sequence_r[] = {
#ifdef CONFIG_CMD_NET
initr_ethaddr,
#endif
#if defined(CONFIG_DM_GPIO_HOG)
gpio_hog_probe_all,
#endif
#ifdef CONFIG_BOARD_LATE_INIT
board_late_init,
#endif