hw/arm/aspeed: Add the 3 front LEDs drived by the PCA9552 #1

The Witherspoon has 3 LEDs connected to a PCA9552. Add them.
The names and reset values are taken from:
https://github.com/open-power/witherspoon-xml/blob/master/witherspoon.xml

Example booting obmc-phosphor-image:

  $ qemu-system-arm -M witherspoon-bmc -trace led_change_intensity
  1592693373.997015:led_change_intensity LED desc:'front-fault-4' color:green intensity 0% -> 100%
  1592693373.997632:led_change_intensity LED desc:'front-power-3' color:green intensity 0% -> 100%
  1592693373.998239:led_change_intensity LED desc:'front-id-5' color:green intensity 0% -> 100%
  1592693500.291805:led_change_intensity LED desc:'front-power-3' color:green intensity 100% -> 0%
  1592693500.312041:led_change_intensity LED desc:'front-power-3' color:green intensity 0% -> 100%
  1592693500.821254:led_change_intensity LED desc:'front-power-3' color:green intensity 100% -> 0%
  1592693501.331517:led_change_intensity LED desc:'front-power-3' color:green intensity 0% -> 100%
  1592693501.841367:led_change_intensity LED desc:'front-power-3' color:green intensity 100% -> 0%
  1592693502.350839:led_change_intensity LED desc:'front-power-3' color:green intensity 0% -> 100%
  1592693502.861134:led_change_intensity LED desc:'front-power-3' color:green intensity 100% -> 0%
  1592693503.371090:led_change_intensity LED desc:'front-power-3' color:green intensity 0% -> 100%

We notice the front-power LED starts to blink at a ~2Hz rate.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Luc Michel <luc.michel@greensocs.com>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20200912134041.946260-5-f4bug@amsat.org>

Author: philmd

hw/arm/Kconfig

@@ -404,6 +404,7 @@ config ASPEED_SOC
     select TMP105
     select TMP421
     select UNIMP
+    select LED
 
 config MPS2
     bool

hw/arm/aspeed.c

@@ -20,6 +20,7 @@
 #include "hw/i2c/smbus_eeprom.h"
 #include "hw/misc/pca9552.h"
 #include "hw/misc/tmp105.h"
+#include "hw/misc/led.h"
 #include "hw/qdev-properties.h"
 #include "qemu/log.h"
 #include "sysemu/block-backend.h"
@@ -525,9 +526,20 @@ static void sonorapass_bmc_i2c_init(AspeedMachineState *bmc)
 
 static void witherspoon_bmc_i2c_init(AspeedMachineState *bmc)
 {
+    static const struct {
+        unsigned gpio_id;
+        LEDColor color;
+        const char *description;
+        bool gpio_polarity;
+    } pca1_leds[] = {
+        {13, LED_COLOR_GREEN, "front-fault-4",  GPIO_POLARITY_ACTIVE_LOW},
+        {14, LED_COLOR_GREEN, "front-power-3",  GPIO_POLARITY_ACTIVE_LOW},
+        {15, LED_COLOR_GREEN, "front-id-5",     GPIO_POLARITY_ACTIVE_LOW},
+    };
     AspeedSoCState *soc = &bmc->soc;
     uint8_t *eeprom_buf = g_malloc0(8 * 1024);
     DeviceState *dev;
+    LEDState *led;
 
     /* Bus 3: TODO bmp280@77 */
     /* Bus 3: TODO max31785@52 */
@@ -538,6 +550,14 @@ static void witherspoon_bmc_i2c_init(AspeedMachineState *bmc)
                                 aspeed_i2c_get_bus(&soc->i2c, 3),
                                 &error_fatal);
 
+    for (size_t i = 0; i < ARRAY_SIZE(pca1_leds); i++) {
+        led = led_create_simple(OBJECT(bmc),
+                                pca1_leds[i].gpio_polarity,
+                                pca1_leds[i].color,
+                                pca1_leds[i].description);
+        qdev_connect_gpio_out(dev, pca1_leds[i].gpio_id,
+                              qdev_get_gpio_in(DEVICE(led), 0));
+    }
     i2c_slave_create_simple(aspeed_i2c_get_bus(&soc->i2c, 4), "tmp423", 0x4c);
     i2c_slave_create_simple(aspeed_i2c_get_bus(&soc->i2c, 5), "tmp423", 0x4c);