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| author | Philippe Mathieu-Daudé <f4bug@amsat.org> | 2020-06-23 09:27:22 +0200 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2020-06-26 14:30:28 +0100 |
| commit | d82ab2931d14c1d8aa27a330b03fe5bf944130cf (patch) | |
| tree | ab28dc10d299d6c4bebe65cb6e33f2d89c086e08 /include | |
| parent | 15ce12cfdd3740d38a7ab19ad0f5c812ff649fed (diff) | |
| download | qemu-d82ab2931d14c1d8aa27a330b03fe5bf944130cf.zip qemu-d82ab2931d14c1d8aa27a330b03fe5bf944130cf.tar.gz qemu-d82ab2931d14c1d8aa27a330b03fe5bf944130cf.tar.bz2 | |
hw/misc/pca9552: Trace GPIO change events
Emit a trace event when a GPIO change its state.
Example booting obmc-phosphor-image:
$ qemu-system-arm -M witherspoon-bmc -trace pca955x_gpio_change
1592690552.687372:pca955x_gpio_change pca1 GPIO id:0 status: 0 -> 1
1592690552.690169:pca955x_gpio_change pca1 GPIO id:1 status: 0 -> 1
1592690552.691673:pca955x_gpio_change pca1 GPIO id:2 status: 0 -> 1
1592690552.696886:pca955x_gpio_change pca1 GPIO id:3 status: 0 -> 1
1592690552.698614:pca955x_gpio_change pca1 GPIO id:13 status: 0 -> 1
1592690552.699833:pca955x_gpio_change pca1 GPIO id:14 status: 0 -> 1
1592690552.700842:pca955x_gpio_change pca1 GPIO id:15 status: 0 -> 1
1592690683.841921:pca955x_gpio_change pca1 GPIO id:14 status: 1 -> 0
1592690683.861660:pca955x_gpio_change pca1 GPIO id:14 status: 0 -> 1
1592690684.371460:pca955x_gpio_change pca1 GPIO id:14 status: 1 -> 0
1592690684.882115:pca955x_gpio_change pca1 GPIO id:14 status: 0 -> 1
1592690685.391411:pca955x_gpio_change pca1 GPIO id:14 status: 1 -> 0
1592690685.901391:pca955x_gpio_change pca1 GPIO id:14 status: 0 -> 1
1592690686.411678:pca955x_gpio_change pca1 GPIO id:14 status: 1 -> 0
1592690686.921279:pca955x_gpio_change pca1 GPIO id:14 status: 0 -> 1
We notice the GPIO #14 (front-power LED) starts to blink.
This LED is described in the witherspoon device-tree [*]:
front-power {
retain-state-shutdown;
default-state = "keep";
gpios = <&pca0 14 GPIO_ACTIVE_LOW>;
};
[*] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm/boot/dts/aspeed-bmc-opp-witherspoon.dts?id=b1f9be9392f0#n140
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Tested-by: Cédric Le Goater <clg@kaod.org>
Message-id: 20200623072723.6324-9-f4bug@amsat.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'include')
0 files changed, 0 insertions, 0 deletions