On Thu, 7 Dec 2017 14:24:57 -0600
Alan Tull atull@xxxxxxxxxx wrote:
...
>> Instead of MFD part as in previous version I intend to add an USB misc
>> driver for our FPGA configuration adapters under drivers/usb/misc.
>> When probing for VID/PID assigned to FIFO-FPP adapter type, this
>> driver will register CBUS GPIO controller, GPIO lookup tables for
>
> I'm not clear how these lookup tables will be specified. Is this
>platform using device tree?
No, this is x86 platform, not using device tree. Therefore we have
to specify device GPIOs for each dynamically added platform device,
e.g. like:
lookup->dev_id = devm_kstrdup(dev, dev_name(dev), GFP_KERNEL);
lookup->table[0].chip_hwnum = N; /* pin offset on this GPIO chip */
lookup->table[0].chip_label = priv->gpiochip->label;
lookup->table[0].con_id = "nconfig";
lookup->table[0].flags = GPIO_ACTIVE_LOW;
lookup->table[1].chip_hwnum = M;
lookup->table[1].chip_label = priv->gpiochip->label;
lookup->table[1].con_id = "conf_done";
lookup->table[1].flags = GPIO_ACTIVE_HIGH;
Then, gpiod_get(dev, "nconfig", GPIOD_OUT_HIGH) in platform driver will
find the appropriate GPIO descriptor.
...
>> Below simplified diagram shows the intended device and drivers
>> relationship for reworking the adapter drivers.
>>
>> +-------------+
>> | |
>> | STRATIX V |PS-SPI FT245 FIFO & GPIO
>> | +-----+ +-------------------+
>> | on Board 1 | + + |
>> | | +----+---+
>> | PCIe | ADBUS&ACBUS | CPLD |
>> +---+---------+ Connection Options +----+---+
>> ^ (MPSSE or FIFO&GPIO) |
>> + + +------+-------+
>> altera-cvp +-----------+----------+ | FPP |
>> | FT232H | | |
>> | 0x0403:0x7148 | | ARRIA 10 |
>> | 0x0403:0x7149 | | |
>> +----------+-----------+ | on Board 2 |
>> | | |
>> +-----------+------------+ | PCIe |
>> USB misc | fpga-cfg-intf USB misc | +----------+---+
>> drv creates| bulk/ctrl xfer | ^
>> platform |ACBUS GPIO Ctrl (0x7148)| |
>> devices |MPSSE GPIO Ctrl (0x7149)| |
>> below +-------+-------+--------+ |
>> | | |
>> for +----+ +------+ for |
>> PID 0x7149 | | PID 0x7148 |
>> +---------+--------+ +-------+---------+ |
>> | ftdi-mpsse-spi + | | | |
>> | altera-ps-spi in | |ftdi-fifo-fpp-mgr| |
>> | spi_board_info | | platform device | |
>> +---------+--------+ +--------+--------+ |
>> ^ ^ |
>> drivers: | | |
>> + | |
>> MPSSE SPI master | |
>> ^ | |
>> | + +
>> altera-ps-spi ftdi-fifo-fpp altera-cvp
>> FPGA Manager FPGA Manager FPGA Manager
>> ^ ^ ^
>> | | |
>> +---------------+ + +---------+
>> fpga-mgr
>>
>
>Just to be clear, this is several solutions that are being
>superimposed in one diagram, depending on which platform you are on,
>right?
Correct, we either have USB -> MPSSE -> PS-SPI -> Stratix V path on
one board, or USB -> FIFO-FPP -> CPLD -> Arria 10 path on another
board.
Anatolij
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