diff options
| author | Otto Pflüger <otto.pflueger@abscue.de> | 2023-07-24 08:56:54 +0200 |
|---|---|---|
| committer | Noralf Trønnes <noralf@tronnes.org> | 2023-08-02 13:18:34 +0200 |
| commit | 3a63ef6e4b9e9db6d1e131f9477f0f4006c894d9 (patch) | |
| tree | e9e4986b100150ce0d545fab29672de30b954481 | |
| parent | 8cc8ccbaa5d89b65a32f0260b0cd2288d2c9b6dc (diff) | |
drm/tiny: panel-mipi-dbi: Allow sharing the D/C GPIO
Displays that are connected to the same SPI bus may share the D/C GPIO.
Use GPIOD_FLAGS_BIT_NONEXCLUSIVE to allow access to the same GPIO for
multiple panel-mipi-dbi instances. Exclusive access to the GPIO during
transfers is ensured by the locking in drm_mipi_dbi.c.
Signed-off-by: Otto Pflüger <otto.pflueger@abscue.de>
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230724065654.5269-3-otto.pflueger@abscue.de
| -rw-r--r-- | drivers/gpu/drm/tiny/panel-mipi-dbi.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/gpu/drm/tiny/panel-mipi-dbi.c b/drivers/gpu/drm/tiny/panel-mipi-dbi.c index eb9f13f18a02..f80a141fcf36 100644 --- a/drivers/gpu/drm/tiny/panel-mipi-dbi.c +++ b/drivers/gpu/drm/tiny/panel-mipi-dbi.c @@ -307,7 +307,8 @@ static int panel_mipi_dbi_spi_probe(struct spi_device *spi) if (IS_ERR(dbi->reset)) return dev_err_probe(dev, PTR_ERR(dbi->reset), "Failed to get GPIO 'reset'\n"); - dc = devm_gpiod_get_optional(dev, "dc", GPIOD_OUT_LOW); + /* Multiple panels can share the "dc" GPIO, but only if they are on the same SPI bus! */ + dc = devm_gpiod_get_optional(dev, "dc", GPIOD_OUT_LOW | GPIOD_FLAGS_BIT_NONEXCLUSIVE); if (IS_ERR(dc)) return dev_err_probe(dev, PTR_ERR(dc), "Failed to get GPIO 'dc'\n"); |