On Thu, Sep 1, 2011 at 5:26 AM, Paul Walmsley <paul@xxxxxxxxx> wrote: > Hi, > > On Wed, 31 Aug 2011, Keerthy wrote: > >> On chip temperature sensor driver. The driver monitors the temperature of >> the MPU subsystem of the OMAP4. It sends notifications to the user space if >> the temperature crosses user defined thresholds via kobject_uevent interface. >> The user is allowed to configure the temperature thresholds vis sysfs nodes >> exposed using hwmon interface. > > I commented in a separate post that this driver should probably use an MFD > driver for the System Control Module accesses, and then this hwmon driver > should use functions from that to access the BANDGAP temperature sensor > registers[1]. > > But I had another comment on this driver. > > A similar sensor is available on the OMAP34xx[2], OMAP36xx[3], and > OMAP4430[4] chips. There are some register layout differences; the > thermal shutdown threshold is configurable on the 4460 but fixed on the > 4430; and also I'd assume, without looking, that the temperature mapping > table is different on different chips. > > So it would seem to make sense to move the chip-specific code and > data into chip-specific source files. > > I could see keeping a generic filename like "omap_temp_sensor.c" if you > implemented a common interface to the bandgap sensors, ADCs and > comparators, across all those different chips. That might be worth > thinking about. But at least, this should probably be named > drivers/hwmon/omap4460_temp_sensor.c, or something similar. The same driver can be used for OMAP5 too. That has 3 instances of the same sensor. So omap4460+? > > > - Paul > > 1. Walmsley, Paul. _Re: [PATCH 4/6 V4] OMAP4: Hwmod: OMAP temperature > sensor_. Posted to the linux-omap@xxxxxxxxxxxxxxx list on Wed, 31 Aug > 2011 17:16:44 -0600. Available from (among others): > http://marc.info/?l=linux-omap&m=131483260632685&w=2 > > 2. Section 7.4.6 "Band Gap Voltage and Temperature Sensor". _OMAP34xx > Multimedia Device Silicon Revision 3.1.x Version R (SWPU223R)_ (public > version). Available from > http://focus.ti.com/pdfs/wtbu/OMAP34xx_ES3.1.x_PUBLIC_TRM_vZR.zip > > 3. Section 13.4.6 "Band Gap Voltage and Temperature Sensor". _OMAP36xx > Multimedia Device Silicon Revision 1.x Version V (SWPU177V)_ (public > version). Available from > http://focus.ti.com/pdfs/wtbu/OMAP36xx_ES1.x_PUBLIC_TRM_vV.zip > > 4. Section 18.4.10 "Band Gap Voltage and Temperature Sensor". _OMAP4430 > Multimedia Device Silicon Revision 2.x Version V (SWPU231V)_ (public > version). Available from > http://focus.ti.com/pdfs/wtbu/OMAP4430_ES2.x_PUBLIC_TRM_vV.zip > -- Regards and Thanks, Keerthy -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
