* FW: Writing to I2C device during Barebox boot [not found] <CE7B48EC.8D30%ivor@veriline.co.za> @ 2013-10-10 1:59 ` Ivor Kruger 2013-10-10 7:42 ` Jan Lübbe 0 siblings, 1 reply; 4+ messages in thread From: Ivor Kruger @ 2013-10-10 1:59 UTC (permalink / raw) To: barebox I can hardly believe it myself but I have succeeded (i think) in writing a new driver for a I2C chip I use. I probe the driver/device during boot and all seems well. The device shows up in the device tree. So before the init process for the board ends, I would like to write a few values to the device (it controls the PSU, thus the reason for doing it in barebox). I want to do this in the board.c file at the end of the pcm049_devices_init function. Is this the right place? But this is where my linux knowledge is letting me down. How do I get a "handle" to the device in order to call the write_reg function? Your pointers and help is much appreciated. _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: FW: Writing to I2C device during Barebox boot 2013-10-10 1:59 ` FW: Writing to I2C device during Barebox boot Ivor Kruger @ 2013-10-10 7:42 ` Jan Lübbe 2013-10-10 13:10 ` Ivor Kruger 0 siblings, 1 reply; 4+ messages in thread From: Jan Lübbe @ 2013-10-10 7:42 UTC (permalink / raw) To: barebox On Wed, 2013-10-09 at 18:59 -0700, Ivor Kruger wrote: > But this is where my linux knowledge is letting me down. > > How do I get a "handle" to the device in order to call the write_reg > function? > > Your pointers and help is much appreciated. Could you show us your code? That would make helping you much easier. Please see 'man git-send-email' on how to send patches with git. Regards, Jan -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Writing to I2C device during Barebox boot 2013-10-10 7:42 ` Jan Lübbe @ 2013-10-10 13:10 ` Ivor Kruger 2013-10-14 8:27 ` Sascha Hauer 0 siblings, 1 reply; 4+ messages in thread From: Ivor Kruger @ 2013-10-10 13:10 UTC (permalink / raw) To: barebox Jan, thanks for the reply, I will look into using git-send-email a bit later since I am going to travel this morning fro a few hours. My question was however a little bit more generic. Take for example the PCM049 board.c file. One of the I2C components it loads is the TWL6030. If I wish to write to a register on this device, how would I go about it. By the way, I am using PHYTEC_PD13_Linux from pengutronix. It includes barebox-2013-06.0 Thanks for your help. Ivor On 2013/10/10 12:42 AM, "Jan Lübbe" <jlu@pengutronix.de> wrote: >On Wed, 2013-10-09 at 18:59 -0700, Ivor Kruger wrote: >> But this is where my linux knowledge is letting me down. >> >> How do I get a "handle" to the device in order to call the write_reg >> function? >> >> Your pointers and help is much appreciated. > >Could you show us your code? That would make helping you much easier. >Please see 'man git-send-email' on how to send patches with git. > >Regards, >Jan >-- >Pengutronix e.K. | | >Industrial Linux Solutions | http://www.pengutronix.de/ | >Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | >Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | > > >_______________________________________________ >barebox mailing list >barebox@lists.infradead.org >http://lists.infradead.org/mailman/listinfo/barebox _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Writing to I2C device during Barebox boot 2013-10-10 13:10 ` Ivor Kruger @ 2013-10-14 8:27 ` Sascha Hauer 0 siblings, 0 replies; 4+ messages in thread From: Sascha Hauer @ 2013-10-14 8:27 UTC (permalink / raw) To: Ivor Kruger; +Cc: barebox Hi Ivor, On Thu, Oct 10, 2013 at 06:10:42AM -0700, Ivor Kruger wrote: > Jan, thanks for the reply, I will look into using git-send-email a bit > later since I am going to travel this morning fro a few hours. > > My question was however a little bit more generic. Take for example the > PCM049 board.c file. One of the I2C components it loads is the TWL6030. If > I wish to write to a register on this device, how would I go about it. When the driver is probed you should see a /dev/twl6030. You can read the registers doing: md -s /dev/twl6030 And you can write registers like this: mw -d /dev/twl6030 <offset> <value> If you wish to read/write registers from code grep the code for twl6030_get. Sascha -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox ^ permalink raw reply [flat|nested] 4+ messages in thread
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2013-10-10 1:59 ` FW: Writing to I2C device during Barebox boot Ivor Kruger
2013-10-10 7:42 ` Jan Lübbe
2013-10-10 13:10 ` Ivor Kruger
2013-10-14 8:27 ` Sascha Hauer
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