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authorH. Nikolaus Schaller <hns@goldelico.com>2019-09-20 19:11:15 +0300
committerTony Lindgren <tony@atomide.com>2019-09-23 20:33:49 +0300
commitf1f028ff89cb0d37db299d48e7b2ce19be040d52 (patch)
treec62f762ad8c26277ea8fbda8f4e85309257344ec /arch/arm/boot/dts/at91sam9g25ek.dts
parent2d3c8ba3cffa00f76bedb713c8c2126c82d8cd13 (diff)
downloadlinux-f1f028ff89cb0d37db299d48e7b2ce19be040d52.tar.xz
DTS: ARM: gta04: introduce legacy spi-cs-high to make display work again
commit 6953c57ab172 "gpio: of: Handle SPI chipselect legacy bindings" did introduce logic to centrally handle the legacy spi-cs-high property in combination with cs-gpios. This assumes that the polarity of the CS has to be inverted if spi-cs-high is missing, even and especially if non-legacy GPIO_ACTIVE_HIGH is specified. The DTS for the GTA04 was orginally introduced under the assumption that there is no need for spi-cs-high if the gpio is defined with proper polarity GPIO_ACTIVE_HIGH. This was not a problem until gpiolib changed the interpretation of GPIO_ACTIVE_HIGH and missing spi-cs-high. The effect is that the missing spi-cs-high is now interpreted as CS being low (despite GPIO_ACTIVE_HIGH) which turns off the SPI interface when the panel is to be programmed by the panel driver. Therefore, we have to add the redundant and legacy spi-cs-high property to properly activate CS. Cc: stable@vger.kernel.org Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com> Signed-off-by: Tony Lindgren <tony@atomide.com>
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