| Message ID | de8774e44a8f6402435e64034b8e7122157f5b52.1607766924.git.hns@goldelico.com |
|---|---|
| State | New |
| Headers | show |
| Series | DTS: ARM: gta04: remove legacy spi-cs-high to make display work again | expand |
* H. Nikolaus Schaller <hns@goldelico.com> [201212 11:59]: > This reverts > > commit f1f028ff89cb ("DTS: ARM: gta04: introduce legacy spi-cs-high to make display work again") > > which had to be intruduced after > > commit 6953c57ab172 ("gpio: of: Handle SPI chipselect legacy bindings") > > broke the GTA04 display. This contradicted the data sheet but was the only > way to get it as an spi client operational again. > > The panel data sheet defines the chip-select to be active low. > > Now, with the arrival of > > commit 766c6b63aa04 ("spi: fix client driver breakages when using GPIO descriptors") > > the logic of interaction between spi-cs-high and the gpio descriptor flags > has been changed a second time, making the display broken again. So we have > to remove the original fix which in retrospect was a workaround of a bug in > the spi subsystem and not a feature of the panel or bug in the device tree. > > With this fix the device tree is back in sync with the data sheet and > spi subsystem code. Thanks applying into fixes. Tony
diff --git a/arch/arm/boot/dts/omap3-gta04.dtsi b/arch/arm/boot/dts/omap3-gta04.dtsi index c8745bc800f71..003202d129907 100644 --- a/arch/arm/boot/dts/omap3-gta04.dtsi +++ b/arch/arm/boot/dts/omap3-gta04.dtsi @@ -124,7 +124,6 @@ lcd: td028ttec1@0 { spi-max-frequency = <100000>; spi-cpol; spi-cpha; - spi-cs-high; backlight= <&backlight>; label = "lcd";
This reverts commit f1f028ff89cb ("DTS: ARM: gta04: introduce legacy spi-cs-high to make display work again") which had to be intruduced after commit 6953c57ab172 ("gpio: of: Handle SPI chipselect legacy bindings") broke the GTA04 display. This contradicted the data sheet but was the only way to get it as an spi client operational again. The panel data sheet defines the chip-select to be active low. Now, with the arrival of commit 766c6b63aa04 ("spi: fix client driver breakages when using GPIO descriptors") the logic of interaction between spi-cs-high and the gpio descriptor flags has been changed a second time, making the display broken again. So we have to remove the original fix which in retrospect was a workaround of a bug in the spi subsystem and not a feature of the panel or bug in the device tree. With this fix the device tree is back in sync with the data sheet and spi subsystem code. Fixes: 766c6b63aa04 ("spi: fix client driver breakages when using GPIO descriptors") CC: stable@vger.kernel.org Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com> --- arch/arm/boot/dts/omap3-gta04.dtsi | 1 - 1 file changed, 1 deletion(-)