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59a18c24ba
linux/drivers/pinctrl
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Stephen Boyd 59a18c24ba pinctrl: qcom: Print high/low status of gpios in debugfs 
I was debugging some gpio issues and I thought that the output of gpio
debugfs was telling me the high or low level of the gpios with a '1' or
a '0'. We saw a line like this though:

 gpio93  : in 4 2mA pull down

and I started to think that there may be a gas leak in the building
because '4' doesn't mean high or low, and other pins said '0' or '1'. It
turns out, '4' is the function selection for the pinmux of the gpio and
not the value on the pin. Reading code helps decipher what debugfs is
actually saying.

Add support to read the input or output pin depending on how the pin is
configured so we can easily see the high or low value of the pin in
debugfs. Now the output looks like

 gpio93  : in   low  func4 2mA pull down

which clearly shows that the pin is an input, low, with function 4 and a
2mA drive strength plus a pull down.

Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: Alexandru M Stan <amstan@chromium.org>
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2018-05-16 15:44:49 +02:00
..
actions pinctrl: actions: Fix Kconfig dependency and help text 2018-05-02 14:36:31 +02:00
aspeed
bcm pinctrl: bcm2835: Add support for output-low output-high properties 2018-05-16 14:01:37 +02:00
berlin
freescale pinctrl: imx: use seq_puts() instead of seq_printf() 2018-05-02 14:36:31 +02:00
intel pinctrl: intel: Implement intel_gpio_get_direction callback 2018-03-23 04:07:22 +01:00
mediatek pinctrl: mtk: fix check warnings. 2018-03-26 10:58:33 +02:00
meson pinctrl: meson: axg: add tdm pins 2018-05-02 14:36:31 +02:00
mvebu pinctrl: mvebu: use correct MPP sel value for dev pins 2018-05-16 14:54:08 +02:00
nomadik pinctrl: nomadik: Drop U8540/9540 support 2018-03-23 03:38:14 +01:00
pxa pinctrl: pxa: pxa2xx: add missing MODULE_DESCRIPTION/AUTHOR/LICENSE 2017-11-30 14:42:04 +01:00
qcom pinctrl: qcom: Print high/low status of gpios in debugfs 2018-05-16 15:44:49 +02:00
samsung pinctrl: samsung: add pin_dbg_show callback for debugfs 2018-05-02 14:36:08 +02:00
sh-pfc pinctrl: sh-pfc: Add r8a77470 PFC support 2018-05-16 13:32:15 +02:00
sirf Merge branch 'gpio-irqchip-rework' of /home/linus/linux-gpio into devel 2017-11-09 09:38:42 +01:00
spear pinctrl: spear: Delete an error message for a failed memory allocation in spear_pinctrl_probe() 2018-01-03 08:46:55 +01:00
sprd pinctrl: sprd: Use seq_putc() in sprd_pinconf_group_dbg_show() 2018-01-16 11:08:24 +01:00
stm32 pinctrl: stm32: add 'depends on HAS_IOMEM' to fix unmet dependency 2018-03-23 04:04:40 +01:00
sunxi pinctrl: sunxi: add support for H6 R_PIO pin controller 2018-05-16 14:19:13 +02:00
tegra pinctrl: tegra20: Provide CDEV1/2 clock muxes 2018-05-16 14:21:32 +02:00
ti pinctrl: ti-iodelay: remove redundant unused variable dev 2017-11-08 13:49:57 +01:00
uniphier pinctrl: uniphier: add LD11 MPEG2-TS I/O pin-mux settings 2018-05-02 14:36:31 +02:00
vt8500 pinctrl: vt8500: Delete an error message for a failed memory allocation in five functions 2018-01-08 08:15:46 +01:00
zte
core.c pinctrl: core: Add missing EXPORT on pinctrl_register_mappings 2018-03-02 11:05:35 +01:00
core.h pinctrl/gpio: Unify namespace for cross-calls 2017-09-22 11:02:10 +02:00
devicetree.c pinctrl: devicetree: Fix dt_to_map_one_config handling of hogs 2018-03-02 09:41:21 +01:00
devicetree.h
Kconfig pinctrl: actions: Add Actions S900 pinctrl driver 2018-05-02 14:36:08 +02:00
Makefile pinctrl: actions: Add Actions S900 pinctrl driver 2018-05-02 14:36:08 +02:00
pinconf-generic.c pinctrl: Add skew-delay pin config and bindings 2017-11-08 13:49:45 +01:00
pinconf.c
pinconf.h
pinctrl-amd.c pinctrl/amd: poll InterruptEnable bits in enable_irq 2018-03-26 11:09:49 +02:00
pinctrl-amd.h pinctrl/amd: save pin registers over suspend/resume 2017-09-12 15:58:45 +02:00
pinctrl-artpec6.c pinctrl: artpec-6: Add smaller groups for uarts 2018-03-01 17:04:09 +01:00
pinctrl-as3722.c
pinctrl-at91-pio4.c pinctrl: at91-pio4: account for const type of of_device_id.data 2018-01-08 08:15:47 +01:00
pinctrl-at91.c pinctrl: at91: Delete an error message for a failed memory allocation in at91_pinctrl_mux_mask() 2018-01-03 08:46:49 +01:00
pinctrl-at91.h
pinctrl-axp209.c pinctrl: axp209: account for const type of of_device_id.data 2018-01-08 08:15:47 +01:00
pinctrl-coh901.c gpio: Move irqdomain into struct gpio_irq_chip 2017-11-08 14:06:21 +01:00
pinctrl-coh901.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pinctrl-da850-pupd.c
pinctrl-digicolor.c
pinctrl-falcon.c
pinctrl-gemini.c This is the bulk of pin control changes for the v4.16 kernel cycle: 2018-02-02 14:22:53 -08:00
pinctrl-ingenic.c pinctrl: ingenic: Remove redundant dev_err call in ingenic_pinctrl_probe() 2018-01-18 08:51:32 +01:00
pinctrl-lantiq.c
pinctrl-lantiq.h
pinctrl-lpc18xx.c
pinctrl-max77620.c pinctrl: max77620: Use common error handling code in max77620_pinconf_set() 2017-11-08 13:49:57 +01:00
pinctrl-mcp23s08.c pinctrl: mcp23s08: add open drain configuration for irq output 2018-02-22 16:08:59 +01:00
pinctrl-ocelot.c pinctrl: ocelot: fix gpio direction 2018-03-26 11:04:48 +02:00
pinctrl-oxnas.c gpio: Move irqdomain into struct gpio_irq_chip 2017-11-08 14:06:21 +01:00
pinctrl-palmas.c pinctrl: palmas: Delete an error message for a failed memory allocation in palmas_pinctrl_probe() 2018-01-03 08:46:49 +01:00
pinctrl-pic32.c gpio: Move irqdomain into struct gpio_irq_chip 2017-11-08 14:06:21 +01:00
pinctrl-pic32.h
pinctrl-pistachio.c gpio: Move irqdomain into struct gpio_irq_chip 2017-11-08 14:06:21 +01:00
pinctrl-rk805.c
pinctrl-rockchip.c pinctrl: rockchip: Fix a typo in four comment lines 2018-01-03 08:46:51 +01:00
pinctrl-rza1.c pinctrl: rza1: Add support for RZ/A1L 2017-10-09 09:16:21 +02:00
pinctrl-single.c pinctrl: pinctrl-single: Fix pcs_request_gpio() when bits_per_mux != 0 2018-03-26 10:48:17 +02:00
pinctrl-st.c gpio: Move irqdomain into struct gpio_irq_chip 2017-11-08 14:06:21 +01:00
pinctrl-sx150x.c pinctrl: sx150x: Add a static gpio/pinctrl pin range mapping 2018-01-18 11:04:47 +01:00
pinctrl-tb10x.c
pinctrl-u300.c
pinctrl-utils.c pinctrl: utils: Delete an error message for a failed memory allocation in pinctrl_utils_add_map_configs() 2018-01-03 08:46:53 +01:00
pinctrl-utils.h
pinctrl-xway.c pinctrl: xway: Delete two error messages for a failed memory allocation in pinmux_xway_probe() 2018-01-03 08:46:53 +01:00
pinctrl-zynq.c
pinmux.c pinctrl: pinmux: Use seq_putc() in pinmux_pins_show() 2018-01-16 11:07:18 +01:00
pinmux.h