Andrew Jeffery 22faec182e pinctrl: aspeed: Fix GPIO requests on pass-through banks ... [ Upstream commit 7aeb353802 ] Commit 6726fbff19bf ("pinctrl: aspeed: Fix GPI only function problem.") fixes access to GPIO banks T and U on the AST2600. Both banks contain input-only pins and the GPIO pin function is named GPITx and GPIUx respectively. Unfortunately the fix had a negative impact on GPIO banks D and E for the AST2400 and AST2500 where the GPIO pass-through functions take similar "GPI"-style names. The net effect on the older SoCs was that when the GPIO subsystem requested a pin in banks D or E be muxed for GPIO, they were instead muxed for pass-through mode. Mistakenly muxing pass-through mode e.g. breaks booting the host on IBM's Witherspoon (AC922) platform where GPIOE0 is used for FSI. Further exploit the names in the provided expression structure to differentiate pass-through from pin-specific GPIO modes. This follow-up fix gives the expected behaviour for the following tests: Witherspoon BMC (AST2500): 1. Power-on the Witherspoon host 2. Request GPIOD1 be muxed via /sys/class/gpio/export 3. Request GPIOE1 be muxed via /sys/class/gpio/export 4. Request the balls for GPIOs E2 and E3 be muxed as GPIO pass-through ("GPIE2" mode) via a pinctrl hog in the devicetree Rainier BMC (AST2600): 5. Request GPIT0 be muxed via /sys/class/gpio/export 6. Request GPIU0 be muxed via /sys/class/gpio/export Together the tests demonstrate that all three pieces of functionality (general GPIOs via 1, 2 and 3, input-only GPIOs via 5 and 6, pass-through mode via 4) operate as desired across old and new SoCs. Fixes: 9b92f5c51e ("pinctrl: aspeed: Fix GPI only function problem.") Signed-off-by: Andrew Jeffery <andrew@aj.id.au> Tested-by: Joel Stanley <joel@jms.id.au> Reviewed-by: Joel Stanley <joel@jms.id.au> Cc: Billy Tsai <billy_tsai@aspeedtech.com> Cc: Joel Stanley <joel@jms.id.au> Link: https://lore.kernel.org/r/20201126063337.489927-1-andrew@aj.id.au Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		2020-12-30 11:50:54 +01:00
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Kconfig	pinctrl: aspeed: Add AST2600 pinmux support	2019-08-05 12:41:18 +02:00
Makefile	pinctrl: aspeed: Add AST2600 pinmux support	2019-08-05 12:41:18 +02:00
pinctrl-aspeed-g4.c	Linux 5.3-rc5	2019-08-21 13:35:16 +02:00
pinctrl-aspeed-g5.c	This is the bulk of pin control changes for the v5.4 kernel	2019-09-19 14:19:33 -07:00
pinctrl-aspeed-g6.c	pinctrl: aspeed-g6: Fix LPC/eSPI mux configuration	2020-01-12 12:21:27 +01:00
pinctrl-aspeed.c	pinctrl: aspeed: Fix GPIO requests on pass-through banks	2020-12-30 11:50:54 +01:00
pinctrl-aspeed.h	This is the bulk of pin control changes for the v5.3 kernel	2019-07-13 15:02:27 -07:00
pinmux-aspeed.c	pinctrl: aspeed: Fix spurious mux failures on the AST2500	2019-09-12 00:08:27 +01:00
pinmux-aspeed.h	pinctrl: aspeed: Fix GPIO requests on pass-through banks	2020-12-30 11:50:54 +01:00