From: Anatolij Gustschin <agust@denx.de>
To: Johan Hovold <johan@kernel.org>
Cc: Lee Jones <lee.jones@linaro.org>,
Linus Walleij <linus.walleij@linaro.org>,
Alan Tull <atull@kernel.org>,
Moritz Fischer <moritz.fischer@ettus.com>,
linux-gpio@vger.kernel.org, linux-fpga@vger.kernel.org,
linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
David Laight <David.Laight@aculab.com>
Subject: Re: [PATCH 1/3] mfd: Add support for FTDI FT232H devices
Date: Tue, 25 Jul 2017 14:34:41 +0200 [thread overview]
Message-ID: <20170725143441.2debeff6@crub> (raw)
In-Reply-To: <20170725114908.GN2729@localhost>
On Tue, 25 Jul 2017 13:49:08 +0200
Johan Hovold johan@kernel.org wrote:
>On Wed, Jul 19, 2017 at 01:58:30PM +0200, Anatolij Gustschin wrote:
>> On Mon, 10 Jul 2017 14:52:10 +0200
>> Johan Hovold johan@kernel.org wrote:
>>
>> >On Thu, Jul 06, 2017 at 10:49:16PM +0200, Anatolij Gustschin wrote:
>> >> Add USB part with common functions for USB-GPIO/I2C/SPI master
>> >> adapters. These allow communication with chip's control, transmit
>> >> and receive endpoints and will be used by various FT232H drivers.
>> >
>> >> +static const struct mfd_cell ftdi_cells[] = {
>> >> + { .name = "ftdi-cbus-gpio", },
>> >> + { .name = "ftdi-mpsse-i2c", },
>> >> + { .name = "ftdi-mpsse-spi", },
>> >> + { .name = "ftdi-fifo-fpp-mgr", },
>> >> +};
>> >
>> >Correct me if I'm wrong, but aren't these modes really mutually
>> >exclusive, possibly with exception of cbus-gpio (some pins are at least
>> >available as GPIOs in MPSSE mode)? Then MFD is not is not the right fit
>> >here either.
>>
>> MPSSE and FIFO modes are mutually exclusive, but I'm not sure about
>> MPSSE and CBUS-GPIO. CBUS-GPIO didn't work as expected when I was
>> testing with MPSSE SPI master driver, but maybe it is a driver issue.
>
>Yes, that wasn't clear to me either from just looking at the data
>sheets. MPSSE seems to deal with its GPIOs differently.
yes, the GPIOs are at different pins in MPSSE mode and these pins are
controlled via writes/reads to/from bulk endpoint with MPSSE commands.
>> FT245 FIFO and CBUS GPIO can be switched by a control request, when
>> FIFO mode is configured in the EEPROM.
>
>Since the set_bitmode command is used to control the CBUS gpios, does
>that mean that they cannot be toggled independently while FIFO mode is
>in use (as the same command is used to set FIFO mode)?
yes.
Thanks,
Anatolij
next prev parent reply other threads:[~2017-07-25 12:34 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-06 20:49 [PATCH 0/3] FPGA Manager support for FPP via FT232H FT245-FIFO Anatolij Gustschin
2017-07-06 20:49 ` [PATCH 1/3] mfd: Add support for FTDI FT232H devices Anatolij Gustschin
2017-07-07 7:48 ` Bjørn Mork
2017-07-07 9:53 ` Anatolij Gustschin
2017-07-10 12:34 ` Johan Hovold
2017-07-11 6:52 ` Anatolij Gustschin
2017-07-12 8:50 ` Johan Hovold
2017-07-12 9:11 ` Bjørn Mork
2017-07-19 13:29 ` Anatolij Gustschin
2017-07-19 13:39 ` David Laight
2017-07-19 15:03 ` Anatolij Gustschin
2017-07-13 16:32 ` Anatolij Gustschin
2017-07-10 12:52 ` Johan Hovold
2017-07-19 8:59 ` Johan Hovold
2017-07-19 12:59 ` Anatolij Gustschin
2017-07-25 11:52 ` Johan Hovold
2017-07-25 12:14 ` Anatolij Gustschin
2017-07-19 11:58 ` Anatolij Gustschin
2017-07-25 11:49 ` Johan Hovold
2017-07-25 12:34 ` Anatolij Gustschin [this message]
2017-07-06 20:49 ` [PATCH 2/3] gpio: Add FT232H CBUS GPIO driver Anatolij Gustschin
2017-08-01 6:49 ` Linus Walleij
2017-08-01 9:24 ` Johan Hovold
2017-08-07 9:24 ` Linus Walleij
2017-07-06 20:49 ` [PATCH 3/3] fpga manager: Add FT232H driver for Altera FPP Anatolij Gustschin
2017-07-07 9:34 ` David Laight
2017-08-02 11:36 ` [PATCH 0/3] FPGA Manager support for FPP via FT232H FT245-FIFO Eric Schwarz
2017-08-02 14:16 ` Alan Tull
2017-08-02 15:30 ` Eric Schwarz
2017-08-02 16:06 ` Greg KH
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