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bac7f4c1bf
linux/drivers/pinctrl
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Masahiro Yamada bac7f4c1bf pinctrl: uniphier: set input-enable before pin-muxing 
While IECTRL is disabled, input signals are pulled-down internally.
If pin-muxing is set up first, glitch signals (Low to High transition)
might be input to hardware blocks.

Bad case scenario:
[1] The hardware block is already running before pinctrl is handled.
   (the reset is de-asserted by default or by a firmware, for example)
[2] The pin-muxing is set up.  The input signals to hardware block
    are pulled-down by the chip-internal biasing.
[3] The pins are input-enabled.  The signals from the board reach the
    hardware block.

Actually, one invalid character is input to the UART blocks for such
SoCs as PH1-LD4, PH1-sLD8, where UART devices start to run at the
power on reset.

To avoid such problems, pins should be input-enabled before muxing.

Fixes: 6e90889202 ("pinctrl: UniPhier: add UniPhier pinctrl core support")
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reported-by: Dai Okamura <okamura.dai@socionext.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2015-10-27 11:07:49 +01:00
..
bcm pinctrl: cygnus: Remove GPIO to Pinctrl pin mapping from driver 2015-10-27 10:44:57 +01:00
berlin pinctrl: berlin: fix BG2CD field widths 2015-10-16 16:42:48 +02:00
freescale pinctrl: freescale: imx7d: support iomux lpsr controller 2015-10-02 14:43:44 -07:00
intel pinctrl: baytrail: Fix compilation warnings when !CONFIG_PM 2015-10-16 22:54:33 +02:00
mediatek pinctrl: mediatek: Remove unneded semicolon 2015-10-02 04:06:47 -07:00
meson Here is the bulk of pin control changes for the v4.2 series: 2015-06-24 19:21:02 -07:00
mvebu Here is the bulk of pin control changes for the v4.2 series: 2015-06-24 19:21:02 -07:00
nomadik genirq: Remove irq argument from irq flow handlers 2015-09-16 15:47:51 +02:00
qcom pinctrl: qcom: ssbi: fix compilation with DEBUG_FS=n 2015-10-16 22:35:52 +02:00
samsung pinctrl: samsung: Remove unneded semicolon 2015-10-02 04:06:48 -07:00
sh-pfc pinctrl: sh-pfc: Remove obsolete r8a7778 platform_device_id entry 2015-10-20 16:11:27 +02:00
sirf pinctrl: atlas7: support atlas7 step B changes 2015-10-16 21:56:07 +02:00
spear genirq: Remove irq argument from irq flow handlers 2015-09-16 15:47:51 +02:00
sunxi pinctrl: sunxi: Add irq pinmuxing to sun6i "r" pincontroller 2015-10-23 10:13:30 +02:00
uniphier pinctrl: uniphier: set input-enable before pin-muxing 2015-10-27 11:07:49 +01:00
vt8500 pinctrl: make pinctrl_register() return proper error code 2015-06-10 14:49:52 +02:00
core.c pinctrl: core: Warn about NULL gpio_chip in pinctrl_ready_for_gpio_range() 2015-09-14 09:13:43 +02:00
core.h pinctrl: Don't just pretend to protect pinctrl_maps, do it for real 2015-05-06 16:24:28 +02:00
devicetree.c pinctrl: simplify of_pinctrl_get() 2015-07-16 09:39:03 +02:00
devicetree.h
Kconfig pinctrl: introduce driver for Atmel PIO4 controller 2015-09-21 11:21:33 -07:00
Makefile pinctrl: introduce driver for Atmel PIO4 controller 2015-09-21 11:21:33 -07:00
pinconf-generic.c pinctrl: pinconf-generic: add "input-schmitt" DT property 2015-10-02 15:09:11 -07:00
pinconf.c pinctrl: join dev_dbg strings into a single line 2015-08-03 10:13:00 +02:00
pinconf.h pinctrl: pinconf-generic: Allow driver to specify DT params 2015-01-11 22:32:19 +01:00
pinctrl-adi2-bf54x.c pinctrl: pinctrl-adi: combine multiple groups of one function together 2014-02-25 10:49:13 +01:00
pinctrl-adi2-bf60x.c added tabs instead of spaces 2015-07-16 09:39:01 +02:00
pinctrl-adi2.c genirq: Remove irq argument from irq flow handlers 2015-09-16 15:47:51 +02:00
pinctrl-adi2.h pinctrl: pinctrl-adi: combine multiple groups of one function together 2014-02-25 10:49:13 +01:00
pinctrl-amd.c genirq: Remove irq argument from irq flow handlers 2015-09-16 15:47:51 +02:00
pinctrl-amd.h Fix inconsistent spinlock of AMD GPIO driver which can be 2015-04-07 11:36:49 +02:00
pinctrl-as3722.c pinctrl: make pinctrl_register() return proper error code 2015-06-10 14:49:52 +02:00
pinctrl-at91-pio4.c pinctrl: at91-pio4: irq argument as been removed from irq flow handlers 2015-10-02 14:52:20 -07:00
pinctrl-at91.c genirq: Remove irq argument from irq flow handlers 2015-09-16 15:47:51 +02:00
pinctrl-at91.h pinctrl: at91: use own header 2014-10-29 09:28:35 +01:00
pinctrl-coh901.c genirq: Remove irq argument from irq flow handlers 2015-09-16 15:47:51 +02:00
pinctrl-coh901.h
pinctrl-digicolor.c pinctrl: digicolor: convert null test to IS_ERR test 2015-09-14 09:13:43 +02:00
pinctrl-falcon.c staging: drivers: pinctrl: Fixed checkpatch.pl warnings 2015-01-21 11:02:26 +01:00
pinctrl-lantiq.c pinctrl: make pinctrl_register() return proper error code 2015-06-10 14:49:52 +02:00
pinctrl-lantiq.h pinctrl: lantiq: fix include guard #endif comment 2015-03-09 18:10:57 +01:00
pinctrl-lpc18xx.c This is the bulk of pin control changes for the v4.3 development 2015-09-04 10:22:09 -07:00
pinctrl-palmas.c pinctrl: make pinctrl_register() return proper error code 2015-06-10 14:49:52 +02:00
pinctrl-pistachio.c genirq: Remove irq argument from irq flow handlers 2015-09-16 15:47:51 +02:00
pinctrl-rockchip.c pinctrl: rockchip: add support for the rk3036 2015-09-25 09:22:55 -07:00
pinctrl-single.c genirq: Remove irq argument from irq flow handlers 2015-09-16 15:47:51 +02:00
pinctrl-st.c genirq: Remove irq argument from irq flow handlers 2015-09-16 15:47:51 +02:00
pinctrl-tb10x.c pinctrl: make pinctrl_register() return proper error code 2015-06-10 14:49:52 +02:00
pinctrl-tegra20.c pinctrl: tegra: some bits move between registers 2015-03-09 18:10:58 +01:00
pinctrl-tegra30.c pinctrl: tegra: some bits move between registers 2015-03-09 18:10:58 +01:00
pinctrl-tegra114.c pinctrl: tegra: some bits move between registers 2015-03-09 18:10:58 +01:00
pinctrl-tegra124.c pinctrl: tegra: some bits move between registers 2015-03-09 18:10:58 +01:00
pinctrl-tegra210.c pinctrl: tegra: add a driver for Tegra210 2015-03-09 18:10:59 +01:00
pinctrl-tegra-xusb.c pinctrl: make pinctrl_register() return proper error code 2015-06-10 14:49:52 +02:00
pinctrl-tegra.c pinctrl: tegra: Only set the gpio range if needed 2015-08-13 16:24:33 +02:00
pinctrl-tegra.h pinctrl: tegra: use signed bitfields for optional fields 2015-03-19 09:20:17 +01:00
pinctrl-tz1090-pdc.c pinctrl: tz1090-pdc: Remove unneded semicolons 2015-10-02 04:06:46 -07:00
pinctrl-tz1090.c pinctrl: tz1090: Remove unneded semicolons 2015-10-02 04:06:46 -07:00
pinctrl-u300.c pinctrl: make pinctrl_register() return proper error code 2015-06-10 14:49:52 +02:00
pinctrl-utils.c pinctrl: utils: include export.h to avoid warnings 2013-08-28 15:50:33 +02:00
pinctrl-utils.h pinctrl: add utility functions for add map/configs 2013-08-14 21:00:41 +02:00
pinctrl-xway.c pinctrl: lantiq: remove bogus of_gpio_chip_add 2015-01-14 14:20:46 +01:00
pinctrl-zynq.c pinctrl: zynq: Fix typos in smc0_nand_grp and smc0_nor_grp 2015-08-25 16:21:31 +02:00
pinmux.c pinctrl: join lines that can be a single line within 80 columns 2015-09-14 09:13:43 +02:00
pinmux.h