[PATCH v3 0/5] PCA I2C GPIO expanders

[Titus Rwantare]

This patch series contains a set of i2c GPIO expanders,
with support for 4, 8, and 16 GPIO connections.

The devices are configured as GPIO inputs by default, but can have pins
configured to be inputs with qmp commands.

For example, the following snippet in a board file for a system,
configures a 16 bit pca6416 to have pins 8-11 as inputs, then asserts
them.

    dev = DEVICE(i2c_slave_create_simple(npcm7xx_i2c_get_bus(soc, 3), 
"pca6416", 0x72));
    object_property_set_uint(OBJECT(dev), "gpio_config", 0x0F00, &error_abort);
    object_property_set_uint(OBJECT(dev), "gpio_input", 0x0F00, &error_abort);

We currently use these to test hardware presence and LEDs in simulation.

Thanks

Since v2:
- switched to extract / deposit API
- added deposit16 to bitops.h
- squashed PCA9538 patch into PCA6416 to use the same send and recv
  functions
- updated unit tests use asymmetric 16-bit test values
- add patch to imply I2C devices on NPCM7xx boards

Since v1:
- addressed comments
- fixed typos in commit messages

Titus Rwantare (5):
  bitops.h: add deposit16 function
  hw/gpio: add PCA953x i2c GPIO expanders
  hw/gpio: add PCA9536 i2c gpio expander
  hw/i2c: add canonical path to i2c event traces
  hw/arm: imply I2C_DEVICES on NPCM7xx

 hw/arm/Kconfig                  |   1 +
 hw/gpio/Kconfig                 |   5 +
 hw/gpio/meson.build             |   1 +
 hw/gpio/pca_i2c_gpio.c          | 410 ++++++++++++++++++++++++++++++++
 hw/gpio/trace-events            |   5 +
 hw/i2c/core.c                   |   8 +-
 hw/i2c/trace-events             |   2 +-
 include/hw/gpio/pca_i2c_gpio.h  |  69 ++++++
 include/qemu/bitops.h           |  26 ++
 roms/edk2                       |   2 +-
 roms/openbios                   |   2 +-
 roms/opensbi                    |   2 +-
 roms/seabios                    |   2 +-
 tests/qtest/meson.build         |   1 +
 tests/qtest/pca_i2c_gpio-test.c | 188 +++++++++++++++
 15 files changed, 716 insertions(+), 8 deletions(-)
 create mode 100644 hw/gpio/pca_i2c_gpio.c
 create mode 100644 include/hw/gpio/pca_i2c_gpio.h
 create mode 100644 tests/qtest/pca_i2c_gpio-test.c

-- 
2.40.0.rc1.284.g88254d51c5-goog