**** BEGIN LOGGING AT Sun Jun 19 02:59:58 2016
Jun 19 11:57:07 <amragaey> Hi all
Jun 19 11:57:29 <amragaey> Did anyone receive another package from GSOC other than the welcome package ?
Jun 19 12:17:15 <ZeekHuge> amragaey: you sure its from Goog ?
Jun 19 12:17:25 <ZeekHuge> it can be from TI
Jun 19 12:17:44 <amragaey> I read the name GSoC student on it
Jun 19 12:17:48 <ZeekHuge> TI is sending us some cool things too.
Jun 19 12:17:49 <amragaey> ZeekHuge, what is TI ?
Jun 19 12:17:59 <ZeekHuge> TI == Texas Instruments
Jun 19 12:18:32 <ZeekHuge> The company the makes the AM33xx processors used by BB boards
Jun 19 12:18:59 <ZeekHuge> The are sending packages to members of this org only
Jun 19 12:19:12 <amragaey> No, I don't think.. I can remember the name hretx hytrex tryhex or something like that :D
Jun 19 12:19:22 <ZeekHuge> and yes, it may have GSoC student on it.
Jun 19 12:19:55 <ZeekHuge> Yes, that is some one stop shop kind of thing and is related to TI
Jun 19 12:20:19 <amragaey> He asked also for $50 taxes :D
Jun 19 12:20:26 <ZeekHuge> ask chanakya_vc, he has already received the package.
Jun 19 12:21:07 <ZeekHuge> Well, that tax may be related to tax laws of your country, not sure about that.
Jun 19 12:21:39 <ZeekHuge> But you have received email from TI right ?
Jun 19 12:21:56 <amragaey> aha they do the same for BB but was $20
Jun 19 12:21:58 <ZeekHuge> If yes, you can just use the given tracking number
Jun 19 12:22:35 <amragaey> I did't receive any emails, and they send it without phone number
Jun 19 12:23:53 <ZeekHuge> They are TI, and you cant expect them to do all those things full of hassle
Jun 19 12:25:28 <ZeekHuge> Anyway, so, it has nothing valuable as such, but the tag : Texas Instruments is itself valuable for me.
Jun 19 12:27:09 <amragaey> ZeekHuge, ok will ask chanakya_vc, hope to be that.
Jun 19 12:27:15 <amragaey> thanks ZeekHuge :D
Jun 19 12:27:20 <ZeekHuge> :)
Jun 19 12:40:45 <chanakya_vc> hey amragaey ,I did receive the TI pavkage
Jun 19 12:40:48 <chanakya_vc> package
Jun 19 12:41:34 <amragaey> hi chanakya_vc , what is it actually :D ?
Jun 19 12:42:01 <chanakya_vc> Nothing just a bunch of small items
Jun 19 12:42:06 <chanakya_vc> amragaey, ^^
Jun 19 12:42:26 <chanakya_vc> Like sunglasses and Beach Ball
Jun 19 12:42:45 <amragaey> hahaha really :D ?
Jun 19 12:42:58 <chanakya_vc> Ya :P
Jun 19 12:43:16 <amragaey> the package was the same size like the welcome one.
Jun 19 12:43:33 <amragaey> is it worth $50 :DD ?
Jun 19 12:43:39 <chanakya_vc> The worst part is that the nearest beach to me in India is nearly 1500 km away :P
Jun 19 12:44:15 <chanakya_vc> No the Package that I received was bigger
Jun 19 12:44:17 <amragaey> the nearest beach here is 300KM :D
Jun 19 12:44:24 <chanakya_vc> amragaey, ^^
Jun 19 12:44:34 <amragaey> I think it's different.
Jun 19 12:44:38 <chanakya_vc> Ohh you are from Egypt right?
Jun 19 12:44:46 <amragaey> yes
Jun 19 12:45:21 <chanakya_vc> Beautiful country.Pyramids are an  awesome sight.
Jun 19 12:45:34 <chanakya_vc> Might be some local tax issue.
Jun 19 12:46:02 <chanakya_vc> But I am sure TI is not sending any electronics item that be as valuable as 50 dollars.
Jun 19 12:46:03 <chanakya_vc> amragaey, ^^
Jun 19 12:49:07 <amragaey> chanakya_vc, yes Egypt has alot of beautiful places and a good climate, you will love it.. prepare a journey after GSoC and call me :D
Jun 19 12:49:39 <amragaey> chanakya_vc, this is a little strange ! :D
Jun 19 13:06:32 <chanakya_vc> amragaey,  Haha. will surely come one day. Want to see Alexandria and the valley of the kings(only seen it on the Discovery channel :P)
Jun 19 13:07:50 <chanakya_vc> amragaey, Yes it is strange. But the box is definitely bigger than the Welcome Package.
Jun 19 13:08:08 <amragaey> chanakya_vc, great :D
Jun 19 13:08:23 <amragaey> chanakya_vc, I'll ask GSoC support : ) thank you
Jun 19 13:09:04 <chanakya_vc> amragaey, You should come to India too(during the winters,right now delhi is too hot).You should see Taj mahal and see the Himalayas.
Jun 19 13:10:57 <chanakya_vc> We in India are lucky to have the Thar desert and the Himalayas in the same country :P.So temperatures in Thar are at around 45 degrees in summers while in Drass valley in himalayas is around -30 degrees in winters.
Jun 19 13:17:55 <amragaey> Oh, that's too hot and too cold :D I would love to see the Himalayas. the temperature here regularly in winter about 10:23 and in summer 25:35
Jun 19 13:23:11 <ZeekHuge> chanakya_vc: there
Jun 19 13:23:12 <ZeekHuge> ?
Jun 19 13:23:21 <chanakya_vc> Yes ZeekHuge
Jun 19 13:23:36 <chanakya_vc> amragaey, Do come if you get the chance :P
Jun 19 13:23:43 <chanakya_vc> ZeekHuge, What's up?
Jun 19 13:25:54 <amragaey> chanakya_vc, yes sure :D
Jun 19 13:27:29 <ZeekHuge> chanakya_vc: so you were asking about my project . right ?
Jun 19 13:27:37 <chanakya_vc> Yes ZeekHuge
Jun 19 13:28:04 <ZeekHuge> its an attempt to end arguments like this : https://groups.google.com/forum/#!topic/beagleboard/cYHCN3GWw_E
Jun 19 13:28:04 <chanakya_vc> I couldn't understand anything about it :P
Jun 19 13:34:41 <chanakya_vc> ZeekHuge, That seems intense :P
Jun 19 13:38:44 <ZeekHuge> intense and interesting , yes.
Jun 19 16:42:06 <m_w> mdp: when are you guys gonna start mentoring him?
Jun 19 16:42:20 <m_w> ooops
Jun 19 16:42:28 <m_w> ;)
Jun 19 18:41:53 <chanakya_vc> Abhishek_, m_w  mdp There?
Jun 19 18:42:50 <m_w> hey chanakya_vc
Jun 19 18:43:52 <m_w> how is your project coming along?
Jun 19 18:44:35 <chanakya_vc> Hey m_w ,I have a doubt. I am writing the driver for SPI. For the moment an internal kernel API has to call the driver and transfer the data for mosi.
Jun 19 18:45:15 <chanakya_vc> So first please take a look at this:http://www.linuxdevcenter.com/pub/a/linux/2007/07/05/devhelloworld-a-simple-introduction-to-device-drivers-under-linux.html?page=2
Jun 19 18:45:30 <chanakya_vc> And http://www.linuxdevcenter.com/pub/a/linux/2007/07/05/devhelloworld-a-simple-introduction-to-device-drivers-under-linux.html?page=3
Jun 19 18:46:21 <chanakya_vc> Here in these two links writing a driver that uses /dev is explained
Jun 19 18:47:23 <m_w> sure
Jun 19 18:48:07 <chanakya_vc> Now m_w My confusion is that this is an example of a userspace API accessing the driver right?I don't think in my case I have to worry about userspace accessing the /dev
Jun 19 18:49:08 <m_w> chanakya_vc: you are going to have to deal with it indirectly I guess
Jun 19 18:49:09 <chanakya_vc> Rather than that my driver has to just expose itself in the kernel.And an internal kernel API has to transfer information right?
Jun 19 18:49:46 <m_w> you are making an SPI driver and hence have to use the SPI subsystem
Jun 19 18:50:03 <m_w> the userspace should be taken care of by the subsystem
Jun 19 18:51:05 <chanakya_vc> Okay that's what I am not able to figure out.How to get information from SPI subsystem. Like her we define a fileoperations structure and then define read and write functions
Jun 19 18:51:08 <chanakya_vc> m_w, ^
Jun 19 18:51:14 <chanakya_vc> *here
Jun 19 18:52:58 <m_w> you shouldn't need any char dev hooks for a SPI host driver
Jun 19 18:53:33 <m_w> there is a specific struct that is used to pass function pointers to the SPI subsystem
Jun 19 18:55:03 <chanakya_vc> m_w, Okay all I need to do is to info through that structure and then let my driver write to a particular address(not using RPMsg as of now).
Jun 19 18:55:47 <chanakya_vc> m_w, Can you point me to a place where I can read about this structure?
Jun 19 18:55:54 <m_w> sure if that is how you are communicating to the PRU now
Jun 19 18:57:22 <m_w> struct spi_master
Jun 19 18:57:40 <m_w> https://www.kernel.org/doc/htmldocs/device-drivers/API-struct-spi-master.html
Jun 19 18:58:49 <m_w> your probe function will fill this struct and call spi_register_master
Jun 19 19:01:06 <m_w> or devm_spi_register_master
Jun 19 19:01:52 <chanakya_vc> Okay,when I insmod my driver, it will fill out this structure and initialize it right?
Jun 19 19:02:21 <chanakya_vc> m_w, I guess I need to look at examples of this struct being used
Jun 19 19:02:32 <chanakya_vc> Any example code you can think of?
Jun 19 19:03:31 <m_w> well one of the drivers in drivers/spi
Jun 19 19:04:48 <chanakya_vc> Okay. I need to research a bit on this. m_w
Jun 19 19:05:25 <m_w> lets take a look at the atmel one for instance
Jun 19 19:06:26 <m_w> take a look at the probe function
Jun 19 19:06:33 <m_w> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/drivers/spi/spi-atmel.c#n1503
Jun 19 19:07:02 <m_w> the SPI host struct is being filled here:
Jun 19 19:07:04 <m_w> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/drivers/spi/spi-atmel.c#n1533
Jun 19 19:07:31 <m_w> the register is taking place here:
Jun 19 19:07:35 <m_w> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/drivers/spi/spi-atmel.c#n1638
Jun 19 19:10:20 <chanakya_vc> Okay so spi_master basically lets the subsystem all the information about the driver right?So then it can pass this to any API on the top right?
Jun 19 19:12:38 <m_w> in essence
Jun 19 19:13:06 <m_w> the spi core will call your functions
Jun 19 19:14:41 <chanakya_vc> m_w,  Okay so its like the fileoperations structure wherein you tell which function to call when read() or write() is called?
Jun 19 19:16:21 <chanakya_vc> m_w, I am not able to understand the use of the probe function?Like is it called the first to be called when insmod is done?
Jun 19 19:21:17 <m_w> the file ops are not handled directly by your driver
Jun 19 19:22:37 <m_w> probe is called when the driver is installed and a matching device is registered via the platform or device tree
Jun 19 19:23:44 <m_w> take a look at this: https://www.kernel.org/doc/Documentation/spi/spi-summary
Jun 19 19:28:57 <nerdboy> i think some people just have a hard time listening and/or assimilating a "new" concept
Jun 19 19:29:04 <nerdboy> re ^^ pru thread
Jun 19 19:29:18 * nerdboy got distracted with a patch again
Jun 19 19:38:38 <m_w> chanakya_vc: http://www.slideshare.net/broonie/whats-going-on-with-spi
Jun 19 19:43:27 <m_w> http://invo-tronics.com/spi-driver-for-linux-based-embedded-system/
Jun 19 19:45:45 <m_w> https://www.youtube.com/watch?v=MByV88orYT4
Jun 19 19:46:00 <chanakya_vc> m_w, I referred to the second link when I was writing my proposal :P
Jun 19 19:47:15 <chanakya_vc> Had certain confusions then. So far I am clear that the struct spi_transfer is the one that both the buffers for receiving and transmitting right?
Jun 19 19:47:38 <m_w> http://stackoverflow.com/questions/22632713/how-to-write-a-simple-linux-device-driver
Jun 19 19:48:24 <m_w> pretty much
Jun 19 19:52:32 <chanakya_vc> m_w, So the functions int(*transfer_one_function) will be called by the SPI core right?When it wants to transfer right?
Jun 19 19:53:21 <chanakya_vc> So I have to custom define this function so it writes to the memory location I want to?
Jun 19 19:53:30 <chanakya_vc> *transfer_one_message
Jun 19 19:55:47 <m_w> yes
Jun 19 19:58:15 <chanakya_vc> Okay m_w . Got it. I will look into this tonight.Thanks for your help!
Jun 19 19:58:34 <m_w> no problem
Jun 19 19:58:50 <chanakya_vc> And the waveforms produced by the firmware:https://github.com/chanakya-vc/PRU-I2C_SPI_master/issues/3
Jun 19 19:58:54 <chanakya_vc> m_w, ^^
Jun 19 20:00:16 <m_w> cool, you figure out mode 3 yet?
Jun 19 20:01:39 <chanakya_vc> I don't know. Weird it missing a clock pulse.m_w
Jun 19 20:02:06 <chanakya_vc> Code for case 2 and 3 is exactly the same
Jun 19 20:03:38 <chanakya_vc> m_w, I am still working on it. Right now I am working on getting  the driver.I want to see the complete setup,the driver transmitting to the firmware and then it bitbanging
Jun 19 20:03:51 <m_w> very strange
Jun 19 20:04:30 <chanakya_vc> m_w, Kind of a tight schedule here. I promised bradfa that I would complete the driver before this week is over.
Jun 19 20:04:38 <chanakya_vc> So I will debug that later.
Jun 19 20:05:08 <chanakya_vc> At least get a major chunk of the driver up if not complete it.
Jun 19 20:09:31 <m_w> okay make sure to let us know if you get stuck on something
Jun 19 20:16:18 <nerdboy> not sure i can tell from that discussion what the best/current docs are
Jun 19 20:16:47 <nerdboy> "i learned by porting it to a new kernel" <= is what i got from it
Jun 19 20:17:13 <m_w> nerdboy: which discussion?
Jun 19 20:17:23 <nerdboy> the ml thread
Jun 19 20:17:50 <nerdboy> https://groups.google.com/forum/#!topic/beagleboard/cYHCN3GWw_E
Jun 19 20:22:13 <m_w> PRU = Probably Rarely Used
Jun 19 20:43:50 <nerdboy> (mailboxes would work too provided you choose mailboxes in DT over interrupts)  <=  interesting
Jun 19 20:47:00 <nerdboy> i have not heard that mentioned before
Jun 19 21:15:05 <nerdboy> there's some good info in there, and a lot of complaining by someone with a "baby" that depends on userspace io hack
**** ENDING LOGGING AT Mon Jun 20 02:59:59 2016