Hi Simon,
On Fri, Nov 11, 2016 at 09:17:20AM -0700, Simon Glass wrote:
Hi Maxime,
On 8 November 2016 at 03:06, Maxime Ripard maxime.ripard@free-electrons.com wrote:
Add a bus driver for bitbanging a 1-Wire bus over a GPIO.
Signed-off-by: Maxime Ripard maxime.ripard@free-electrons.com
drivers/w1/Kconfig | 6 ++- drivers/w1/Makefile | 1 +- drivers/w1/w1-gpio.c | 160 ++++++++++++++++++++++++++++++++++++++++++++- 3 files changed, 167 insertions(+), 0 deletions(-) create mode 100644 drivers/w1/w1-gpio.c
diff --git a/drivers/w1/Kconfig b/drivers/w1/Kconfig index 0c056b4c06a9..ccc3ae15db86 100644 --- a/drivers/w1/Kconfig +++ b/drivers/w1/Kconfig @@ -12,6 +12,12 @@ config W1
if W1
+config W1_GPIO
bool "Enable 1-Wire GPIO bitbanging"depends on DM_GPIOhelpEmulate a 1-Wire bus using a GPIO.Any more details? How many GPIOs? Any particular chips that are supported?
1-Wire works on a single line, hence it's name. You usually have either a controller (which is quite rare, but some SoCs have one) or you can bitbang the bus. It's low bandwidth enough that it doesn't really matter.
I'm not sure if it answers your question. I'll address your other comments.
Thanks! Maxime