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nwf opened this issue Nov 30, 2017 · 4 comments
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CONFIG_GPIO_PCF857X=m would be nice to have #2294

nwf opened this issue Nov 30, 2017 · 4 comments

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@nwf
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nwf commented Nov 30, 2017

PCF857x-s are nice, inexpensive I2C I/O expanders, very useful for low-bandwidth communication across a large number of I/O lines and/or at a distance (running just I2C being much easier than a dozen I/Os back to the Pi). It'd be nice to have the kernel's GPIO subsystem driver for these around by default. It's 15 KB.
@pelwell
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pelwell commented Nov 30, 2017

It sounds like you've compiled it yourself. Have you also created an overlay for it?

@nwf
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nwf commented Nov 30, 2017

If I understand your question correctly, I have not and have just used the /sys interface to the I2C bus to attach the devices, rather than use a device tree overlay.

pelwell pushed a commit that referenced this issue Nov 30, 2017
config: Add GPIO_PCF857X=m
5c1521c 
The PCF8574 & 5 are I2C-connected 8- & 16-bit GPIO expanders.

See: #2294

Signed-off-by: Phil Elwell <[email protected]>
@pelwell
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pelwell commented Nov 30, 2017

Done.

pelwell pushed a commit that referenced this issue Nov 30, 2017
config: Add GPIO_PCF857X=m
998c0e9 
The PCF8574 & 5 are I2C-connected 8- & 16-bit GPIO expanders.

See: #2294

Signed-off-by: Phil Elwell <[email protected]>
@nwf
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nwf commented Nov 30, 2017

Thanks!

@nwf nwf closed this as completed Nov 30, 2017
popcornmix added a commit to raspberrypi/firmware that referenced this issue Dec 1, 2017
@popcornmix
kernel: Bump to 4.9.66
9426e18 
kernel: config: Add GPIO_PCF857X=m
See: raspberrypi/linux#2294

kernel: mcp2515: Use DT-supplied interrupt flags
See: raspberrypi/linux#2175

kernel: cgroup: Fix automatic disabling of cgroup memory
See: https://github.com/raspberrypi/issues/1950

firmware: arm_dt: Suppress non-fatal errors
See: #906

firmware: dtoverlay: Create "/aliases" node when needed
See: #906
popcornmix added a commit to Hexxeh/rpi-firmware that referenced this issue Dec 1, 2017
@popcornmix
kernel: Bump to 4.9.66
1264144 
kernel: config: Add GPIO_PCF857X=m
See: raspberrypi/linux#2294

kernel: mcp2515: Use DT-supplied interrupt flags
See: raspberrypi/linux#2175

kernel: cgroup: Fix automatic disabling of cgroup memory
See: https://github.com/raspberrypi/issues/1950

firmware: arm_dt: Suppress non-fatal errors
See: raspberrypi/firmware#906

firmware: dtoverlay: Create "/aliases" node when needed
See: raspberrypi/firmware#906
popcornmix added a commit to raspberrypi/firmware that referenced this issue Dec 5, 2017
@popcornmix
kernel: Bump to 4.9.67
62640e8 
kernel: config: Add GPIO_PCF857X=m
See: raspberrypi/linux#2294
popcornmix added a commit to Hexxeh/rpi-firmware that referenced this issue Dec 5, 2017
@popcornmix
kernel: Bump to 4.9.67
3d557e7 
kernel: config: Add GPIO_PCF857X=m
See: raspberrypi/linux#2294
raspbian-autopush pushed a commit to raspbian-packages/linux-4.9 that referenced this issue Apr 7, 2018
rpi_1427_0db56de6310518050fc49331cfb5617964079092
9cf2936 
commit 0db56de
Author: Phil Elwell <[email protected]>
Date:   Thu Nov 30 09:04:07 2017 +0000

    config: Add GPIO_PCF857X=m
    
    The PCF8574 & 5 are I2C-connected 8- & 16-bit GPIO expanders.
    
    See: raspberrypi/linux#2294
    
    Signed-off-by: Phil Elwell <[email protected]>


Gbp-Pq: Topic rpi
Gbp-Pq: Name rpi_1427_0db56de6310518050fc49331cfb5617964079092.patch
raspbian-autopush pushed a commit to raspbian-packages/linux-4.9 that referenced this issue Nov 11, 2018
@raspbian-autopush
rpi_1427_0db56de6310518050fc49331cfb5617964079092
57a1395 
commit 0db56de
Author: Phil Elwell <[email protected]>
Date:   Thu Nov 30 09:04:07 2017 +0000

    config: Add GPIO_PCF857X=m
    
    The PCF8574 & 5 are I2C-connected 8- & 16-bit GPIO expanders.
    
    See: raspberrypi/linux#2294
    
    Signed-off-by: Phil Elwell <[email protected]>


Gbp-Pq: Topic rpi
Gbp-Pq: Name rpi_1427_0db56de6310518050fc49331cfb5617964079092.patch
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@nwf @pelwell