Re: [PATCH v5 4/7] hw/arm/aspeed: Add the 3 front LEDs drived by the PCA9552 #1

[Luc Michel]

On 9/10/20 10:54 PM, Philippe Mathieu-Daudé wrote:
> 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>
> Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>

Reviewed-by: Luc Michel <luc.michel@greensocs.com>

> ---
>   hw/arm/aspeed.c | 20 ++++++++++++++++++++
>   hw/arm/Kconfig  |  1 +
>   2 files changed, 21 insertions(+)
>
> diff --git a/hw/arm/aspeed.c b/hw/arm/aspeed.c
> index 8bfb1c79ddc..83e322ea983 100644
> --- a/hw/arm/aspeed.c
> +++ b/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"
> @@ -521,9 +522,20 @@ 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 */
> @@ -534,6 +546,14 @@ 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);
>   
> diff --git a/hw/arm/Kconfig b/hw/arm/Kconfig
> index bc3a423940b..06ba1c355b1 100644
> --- a/hw/arm/Kconfig
> +++ b/hw/arm/Kconfig
> @@ -394,6 +394,7 @@ config ASPEED_SOC
>       select TMP105
>       select TMP421
>       select UNIMP
> +    select LED
>   
>   config MPS2
>       bool