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<apelete>
larsc: Hi, are you there ?
<larsc>
yes, I'm always here ;)
<apelete>
larsc: nice :)
<apelete>
been reading some more kernel code, I need some help to get a clearer picture
<larsc>
sure
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<apelete>
okay
<apelete>
if musb is a specific host controller driver for the usb IP used in the NN, how does the driver we have now talk with the usb subsystem ?
<larsc>
it registers itself as a usb gadget driver
<apelete>
and it shouldn't ? what benefit do we have by using musb to do that ?
<larsc>
not having duplicated code
<larsc>
and the current driver is in a rather doubious shape
<larsc>
If we use the musb driver we only have to write a very thin layer of additional code
<larsc>
which is much easier to maintain of course
<apelete>
<larsc> not having duplicated code
<apelete>
what part of the jz4740_udc driver is duplicating code exactly ? the host controller driver code (I'm asking because that's what musb seems to be) ?
<apelete>
in fact I'm trying to know what I really need to do.
<apelete>
last time you said that the drivers that are using musb today implements both a host driver *and* a gadget driver
<larsc>
yes
<larsc>
and the jz4740 gadget driver is duplicated code of the musb gadget driver
<apelete>
do we want a gadget driver or a host driver (or both) for the NN ?
<apelete>
in my understanding, we want a gadget driver that is "musb compliant"
<larsc>
gadget
<larsc>
the IP core used in the jz4740 is the musb core
<larsc>
so we want to use the musb driver
<apelete>
ok, so we need a gagdet driver that register to musb. good.
<larsc>
what we need is a platform glue code for jz4740 for the musb driver
<larsc>
which is stuff like IO access, clocks and interrupts
<apelete>
haha. so musb is already a host and gadget driver by itself ? and platform code is used to take advantage of the musb driver ?
<larsc>
yes
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<apelete>
ok. so that's why you were also saying that there was some work needed to be done in musb in order for it to register host and gadget part independantly ? (because today musb is registering both gadget and host driver at the same time, it does not register only one)
<larsc>
yep
<apelete>
okay. in a nutshell we want 2 things:
<apelete>
1/ write platform glue code for jz4740 to use musb gadget driver
<apelete>
2/ modify musb to register either as gadget or host driver or both
<apelete>
am I correct ?
<larsc>
yes
<apelete>
larsc: okay, thank you very much. this is important because I am struggling to understand what exactly musb is, and how is it different from ohci, uhci drivers in linux (basically how does it fit in the usb subsystem).
<apelete>
larsc: I may not get it right now, but I think I will start by writing some code for 1/
<larsc>
nice
<apelete>
larsc: I hope it will get clearer to me by writing code, and we will discuss it more by then if you don't mind :)
<wpwrak>
apelete: from http://elinux.org/MUSB: "The MUSBMHDRC DRD OTG Controller (from now on referred to as MUSB is a Dual-Role OTG IP Core used in several SoC implementations. At the time of this writing at least OMAP, DaVinci and Blackfins integrate that IP Core in the SoC and a discrete version of it is supplied by Texas Instruments as the tusb6010 ASIC."
<apelete>
wpwrak: yes, you're talking about the asic there, the chip inside the device (I understand "IP core" as "asic" )
<apelete>
right ?
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<apelete>
what I was struggling with until now is "what is musb and how does it fit in the linux usb subsystem ?"
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<apelete>
from what I understand now, musb in the kernel is a driver implementation for the MUSB IP Core used in the NN
<apelete>
and to take advantage of the musb driver, one as to write a platform glue code for it.
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<wpwrak>
apelete: well, it's the corresponding part of the jz4740 asic. there are others: the actual CPU core, UART, MMC, SPI, etc.
<wpwrak>
an yes, the driver is names after the hardware :)
<wpwrak>
s/names/named
<wpwrak>
oh, our bot is gone. interesting
<apelete>
wpwrak: ok, thanks.
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<apelete>
wpwrak larsc: I'll have a look at the platform glue code already in the kernel as an example to get started. will let you know how it goes.
<apelete>
wpwrak larsc: ha, btw, how do you debug kernel code on the NN ?
<apelete>
did you solder a serial output to the NN ?