diff options
| author | Andreas Kaessens <akaessens@gmail.com> | 2021-06-10 15:24:37 +0200 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2021-06-12 01:58:10 +0200 |
| commit | 4e73bfa3ee37277e3f3e636786fd52d89273bd79 (patch) | |
| tree | b454c349471be824e1c10deeb3e7f92a413c9824 /drivers/pinctrl/pinctrl-mcp23s08.h | |
| parent | ca199e1952cc7cfce9b416547108b52df05f61d4 (diff) | |
pinctrl: mcp23s08: Add optional reset GPIO
The MCP23x port expander RESET# line can be connected to a host GPIO.
The optional reset-gpio must be set to LOW if the reset is asserted
at probing time.
On page 5 in the datasheet [0] the "Device Active After Reset high"
time is specified at 0 µs. Therefore no waiting is needed after the
reset transition.
[0] https://ww1.microchip.com/downloads/en/DeviceDoc/20001952C.pdf
Signed-off-by: Andreas Kaessens <akaessens@gmail.com>
Signed-off-by: Darian Biastoch <d.biastoch@gmail.com>
Link: https://lore.kernel.org/r/20210610132438.3085841-1-akaessens@gmail.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/pinctrl/pinctrl-mcp23s08.h')
| -rw-r--r-- | drivers/pinctrl/pinctrl-mcp23s08.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/pinctrl/pinctrl-mcp23s08.h b/drivers/pinctrl/pinctrl-mcp23s08.h index 90dc27081a3c..b8d15939e0c2 100644 --- a/drivers/pinctrl/pinctrl-mcp23s08.h +++ b/drivers/pinctrl/pinctrl-mcp23s08.h @@ -43,6 +43,7 @@ struct mcp23s08 { struct pinctrl_dev *pctldev; struct pinctrl_desc pinctrl_desc; + struct gpio_desc *reset_gpio; }; extern const struct regmap_config mcp23x08_regmap; |