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| Started by | Dmitry Torokhov <dmitry.torokhov@gmail.com> |
|---|---|
| First post | 2015-12-13 06:00 +0100 |
| Last post | 2015-12-13 22:00 +0100 |
| Articles | 2 — 2 participants |
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Re: [PATCH 2/2] Input: add touchscreen support for TS-4800 Dmitry Torokhov <dmitry.torokhov@gmail.com> - 2015-12-13 06:00 +0100
Re: [PATCH 2/2] Input: add touchscreen support for TS-4800 Damien Riegel <damien.riegel@savoirfairelinux.com> - 2015-12-13 22:00 +0100
| From | Dmitry Torokhov <dmitry.torokhov@gmail.com> |
|---|---|
| Date | 2015-12-13 06:00 +0100 |
| Subject | Re: [PATCH 2/2] Input: add touchscreen support for TS-4800 |
| Message-ID | <qF6Vj-3FP-1@gated-at.bofh.it> |
Hi Damien, On Thu, Dec 10, 2015 at 11:11:12AM -0500, Damien Riegel wrote: > On this board, the touchscreen, an ads7843, is not handled directly by > Linux but by a companion FPGA. This FPGA is memory-mapped and the IP > design is very similar to the mk712. ... > + > + poll_dev = devm_input_allocate_polled_device(&pdev->dev); > + if (!poll_dev) > + return -ENOMEM; I wonder how useful touchscreen implemented as polling device is. Isn't there an interrupt line for it? Thanks. -- Dmitry -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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| From | Damien Riegel <damien.riegel@savoirfairelinux.com> |
|---|---|
| Date | 2015-12-13 22:00 +0100 |
| Message-ID | <qFlUm-4PZ-13@gated-at.bofh.it> |
| In reply to | #1290566 |
Hi Dmitry On Sat, Dec 12, 2015 at 08:58:58PM -0800, Dmitry Torokhov wrote: > Hi Damien, > > On Thu, Dec 10, 2015 at 11:11:12AM -0500, Damien Riegel wrote: > > On this board, the touchscreen, an ads7843, is not handled directly by > > Linux but by a companion FPGA. This FPGA is memory-mapped and the IP > > design is very similar to the mk712. > > ... > > > + > > + poll_dev = devm_input_allocate_polled_device(&pdev->dev); > > + if (!poll_dev) > > + return -ENOMEM; > > I wonder how useful touchscreen implemented as polling device is. Isn't > there an interrupt line for it? There is an interrupt line between the touchscreen and the FGPA, but not between the FPGA and the SoC. I agree it is a bit peculiar. Hopefully on more recent boards, they changed their design to handle the touchscreen directly with Linux. Thanks, Damien > Thanks. > > -- > Dmitry -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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