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The pca9552 LED blinkers on the Witherspoon machine are used for leds but also as GPIOs to control fans and GPUs. Signed-off-by: Cédric Le Goater <clg@kaod.org> Reviewed-by: Andrew Jeffery <andrew@aj.id.au> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-id: 20180530064049.27976-8-clg@kaod.org Signed-off-by: Peter Maydell <peter.maydell@linaro.org>