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b83bd893f3
linux/drivers/pinctrl
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Stefan Wahren b83bd893f3 pinctrl: bcm2835: reduce GPPUD set-up time 
Since the BCM2835 datasheet doesn't exactly specify the set-up time for
the GPIO Pull-up/down Clock Registers there was an assumption of 150 cycles
at a clock rate of 1 MHz. During a discussion [1] in the Raspberry Pi forum
it turns out that clock rate refers to the VPU which has a rate of 250 MHz.
So we can reduce the delay to a sensible value and update the comment above.

I tested this optimization with a Raspberry Pi B and a multimeter.

[1] - https://www.raspberrypi.org/forums/viewtopic.php?f=72&t=163352

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2016-11-04 16:28:28 +01:00
..
aspeed pinctrl: aspeed-g5: Fix pin association of SPI1 function 2016-10-18 14:36:12 +02:00
bcm pinctrl: bcm2835: reduce GPPUD set-up time 2016-11-04 16:28:28 +01:00
berlin
freescale pinctrl: imx: accept gpio request/free from pinctrl 2016-09-12 14:25:52 +02:00
intel pinctrl: cherryview: Drop ctrlX prefix from the pin debugfs output 2016-11-04 16:14:51 +01:00
mediatek pinctrl: mediatek: constify gpio_chip structures 2016-09-13 10:39:33 +02:00
meson Linux 4.8-rc6 2016-09-23 14:57:16 +02:00
mvebu pinctrl: mvebu: orion5x: Generalise mv88f5181l support for 88f5181 2016-09-21 11:49:18 +02:00
nomadik pinctrl: nomadik: don't default-flag IRQs as falling 2016-09-19 11:01:33 +02:00
pxa
qcom pinctrl: qcom: fix masking of pinmux functions 2016-10-04 00:36:20 +02:00
samsung Merge branch 'fixes' into devel 2016-09-23 17:41:40 +02:00
sh-pfc pinctrl: sh-pfc: r8a7794: Implement voltage switching for SDHI 2016-09-14 09:26:54 +02:00
sirf pinctrl: sirf: make core support explicitly non-modular 2016-08-27 13:16:12 +02:00
spear
stm32 pinctrl: stm32: add IRQ_DOMAIN_HIERARCHY dependency 2016-09-15 14:13:10 +02:00
sunxi pinctrl: sunxi: Deal with configless pins 2016-10-29 11:08:24 +02:00
tegra This is the bulk of pin control changes for the v4.8 kernel cycle. 2016-07-28 17:06:51 -07:00
uniphier pinctrl: uniphier: add Ethernet pin-mux settings 2016-07-11 09:53:25 +02:00
vt8500
core.c pinctrl: copy per-pin driver private data to struct pin_desc 2016-05-31 10:27:19 +02:00
core.h pinctrl: copy per-pin driver private data to struct pin_desc 2016-05-31 10:27:19 +02:00
devicetree.c pinctrl: OF: Don't create a pinctrl handle if no pinctrl entries exist 2016-06-18 10:40:15 +02:00
devicetree.h
Kconfig pinctrl: max77620: add OF dependency 2016-10-29 10:30:16 +02:00
Makefile pinctrl: Add SX150X GPIO Extender Pinctrl Driver 2016-10-24 16:30:40 +02:00
pinconf-generic.c pinctrl: generic: Parse pinmux init nodes if node status is okay 2016-10-29 10:31:58 +02:00
pinconf.c pinctrl: pinconf: separate config parameters with commas for debugfs 2016-05-31 10:29:06 +02:00
pinconf.h
pinctrl-adi2-bf54x.c
pinctrl-adi2-bf60x.c
pinctrl-adi2.c
pinctrl-adi2.h
pinctrl-amd.c Linux 4.8-rc6 2016-09-23 14:57:16 +02:00
pinctrl-amd.h
pinctrl-as3722.c
pinctrl-at91-pio4.c pinctrl: at91-pio4: make it explicitly non-modular 2016-06-13 08:40:14 +02:00
pinctrl-at91.c pinctrl: at91: add support for OUTPUT config 2016-10-31 09:16:46 +01:00
pinctrl-at91.h
pinctrl-coh901.c
pinctrl-coh901.h
pinctrl-digicolor.c Revert "pinctrl: digicolor: add missing platform_set_drvdata() call" 2016-06-23 09:50:05 +02:00
pinctrl-falcon.c
pinctrl-lantiq.c
pinctrl-lantiq.h
pinctrl-lpc18xx.c pinctrl: lpc18xx: make it explicitly non-modular 2016-06-13 08:28:18 +02:00
pinctrl-max77620.c pinctrl: max77620: Remove unused structure definition 2016-06-15 08:37:40 +02:00
pinctrl-oxnas.c pinctrl: oxnas: Add support for OX820 2016-10-24 16:30:14 +02:00
pinctrl-palmas.c pinctrl: palmas: fix a possible NULL dereference 2016-08-22 14:11:00 +02:00
pinctrl-pic32.c
pinctrl-pic32.h
pinctrl-pistachio.c pinctrl: pistachio: fix mfio pll_lock pinmux 2016-08-22 15:28:35 +02:00
pinctrl-rockchip.c pinctrl: rockchip: make it explicitly non-modular 2016-08-27 13:14:21 +02:00
pinctrl-single.c pinctrl: single: Drop pointless macro 2016-10-28 13:54:00 +02:00
pinctrl-st.c pinctrl: st: Remove STiH415/6 SoC pinctrl driver support. 2016-09-15 15:55:25 +02:00
pinctrl-sx150x.c pinctrl: Add SX150X GPIO Extender Pinctrl Driver 2016-10-24 16:30:40 +02:00
pinctrl-tb10x.c
pinctrl-tz1090-pdc.c
pinctrl-tz1090.c
pinctrl-u300.c pinctrl: u300: make u300_pmx_registers static 2016-06-13 09:27:43 +02:00
pinctrl-utils.c
pinctrl-utils.h
pinctrl-xway.c This is the bulk of pin control changes for the v4.8 kernel cycle. 2016-07-28 17:06:51 -07:00
pinctrl-zynq.c pinctrl: zynq: Add a 8 bit wide nand option 2016-11-04 15:19:00 +01:00
pinmux.c pinctrl: return -ENOMEM instead of -EINVAL for kasprintf() failure 2016-05-31 10:33:00 +02:00
pinmux.h