@@ -228,8 +228,19 @@ static int mlxreg_led_config(struct mlxreg_led_priv_data *priv)
brightness = LED_OFF;
led_data->base_color = MLXREG_LED_GREEN_SOLID;
}
- snprintf(led_data->led_cdev_name, sizeof(led_data->led_cdev_name),
- "mlxreg:%s", data->label);
+
+ /*
+ * Id greater than zero is used for LEDs located on replaceable unit,
+ * like line card or fabric card. In this case Id is set to I2C bus
+ * number. Otherwise LEDs located on the main board. The field "identity"
+ * specifies the type of bus connecting line card to the chassis.
+ */
+ if (priv->pdev->id > 0)
+ sprintf(led_data->led_cdev_name, "%scard%d:%s", led_pdata->identity,
+ priv->pdev->id, data->label);
+ else
+ sprintf(led_data->led_cdev_name, "%s:%s", "mlxreg",
+ data->label);
led_cdev->name = led_data->led_cdev_name;
led_cdev->brightness = brightness;
led_cdev->max_brightness = LED_ON;
It could be more than one instance of LED with the same name in the modular systems. For example, "status" or "uid" LED can be located on chassis and on each line card of modular system. In order to avoid conflicts with duplicated names, append platform device Id, which is unique, to LED name after driver name. Thus, for example, "status" LED on chassis is to be called, like it is called now on non-modular systems, on which platform device Id is not specified: "mlxreg:status:green". While for the line cards LEDs it will be called like: "pcicard48:status:green", "ibcard66:status:green", "nvlinkcard68:status:green", etcetera. Where line card prefix is specified according to the type of bus connecting line card to the chassis: PCI, InfiniBand, NVLink and so on. LED driver works on top of register space of the programmable devices (CPLD or FPGA), providing the logic for LED control. The programmable devices on the line cards are connected through I2C bus and LED driver will work over I2C. On main board programmable device is connected through LPC, and LED driver works over LPC. The motivation it to provide support for new modular systems which could be equipped with the different types of replaceable line cards and management board. Line cards are connected to the chassis through I2C interface for the chassis management operations and through PCIe for the networking operations. Future line cards could be connected to the chassis through InfiniBand fabric, instead of PCIe. The first type of line card supports 16x100GbE QSFP28 Ethernet ports. Those line cards equipped with the programmable devices aimed for system control of Nvidia Ethernet switch ASIC control, Nvidia FPGA, Nvidia gearboxes (PHYs). The next coming card generations are supposed to support: - Line cards with 8x200Gbe QSFP28 Ethernet ports. - Line cards with 4x400Gbe QSFP-DD Ethernet ports. - Smart cards equipped with Nvidia ARM CPU for offloading and for fast access to the storage (EBoF). - Fabric cards for inter-connection. Signed-off-by: Vadim Pasternak <vadimp@nvidia.com> --- v2->v3: Changes added after comments from Pavel. - Use prefix to specify type of connectivity for particular line card. v1->v2: Changes added after discussion with Pavel and Marek. - Change device name for line cards from "mlxreg" to "card". - Extend commit text - add more explanations. --- drivers/leds/leds-mlxreg.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-)