Messages in this thread | | | From | Colin Foster <> | Subject | [PATCH v1 pinctrl-next 0/1] add blink and activity functions to SGPIO | Date | Tue, 28 Dec 2021 16:37:28 -0800 |
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Expose a debugfs / devicetree interface for Microsemi SGPIO controllers. By writing values of 2-5, the SGPIO pins can be configured for either automatic blinking or activity.
The implementation is modeled after the code in /drivers/pinctrl/pinctrl-ocelot.c.
I have only tested this with currently out-of-tree patches for the VSC7512 that I hope to get in soon. They are not needed for VSC7513 / VSC7514, SPARX5, or LUTON - but I don't have any hardware to test.
Of note: the 7512 chip has a discrepancy between the datasheet and the registers. The datahseet claims 20Hz blink default frequency, the registers claim 5 Hz default frequency for BMODE_0. I override the OCELOT registers to correct for this. I don't know if that is needed for LUTON or SPARX, but having two blink modes at the same frequency isn't beneficial. As such, I make the blink modes match the 5Hz / 20Hz for the two modes.
Tested with VSC7512 by way of: echo SGPIO_O_p1b0 {blink0,blink1,activity0,activity1} > /sys/kernel/debug/pinctrl/pinctrl-sgpio-pinctrl-sgpio-output/pinmux-select
LEDs blink!
Colin Foster (1): pinctrl: microchip-sgpio: add activity and blink functionality
drivers/pinctrl/pinctrl-microchip-sgpio.c | 135 +++++++++++++++++++++- 1 file changed, 130 insertions(+), 5 deletions(-)
-- 2.25.1
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