Re: 회신: 회신: [PATCH] ODROID-X: hkdk4412: Add new hardware based on Exynos4412
On 8/7/12, Thomas Abraham wrote: > On 7 August 2012 07:58, Olof Johansson wrote: >> Hi, >> >> On Mon, Aug 6, 2012 at 7:05 PM, Dongjin Kim >> wrote: >>> Hello, >>> >>> I am trying to understand what I have to do for device tree. >>> >>> In order to create dts file for ODROID-X hardware, it seems I may need >>> dts file of EXYNOS4412 SoC. >>> But maybe exynos4412.dtsi is not merged yet or not exist, like >>> exynos4210.dtsi or exynos5250.dtsi. >>> Obviously it seems not easy to create such a file without SoC datasheet, >>> and I do not have it. >>> >>> So do I wait for the file to be merged by Samsung or better to create >>> initial dts file cloned from exynos4210.dtsi and modify to have verified >>> nodes with the source/header files? >> >> Ideally they already have one waiting to be submitted, but that might >> not be the case. Given that the origenboard design with 4412 is not >> yet shipping, I'm guessing the Linaro Samsung engineers might not have >> done much work on 4412 yet. Kukjin? Thomas? >> >>> What's your suggestion? >> >> The alternative is to use the data you have available -- i.e. sources >> and patches, and craft the device tree from there. The design of 4412 >> is a derivative from 4210, so that's a good start. Next step would be >> to describe the board on top of the SoC, peripherals, etc. Take a look >> at how the origen board support was added, and so on. >> >> I ordered an odroid-x several weeks ago but I haven't have a confirmed >> shipping date yet. :( I'm not sure how long it'll be before I can help >> out, unfortunately. >> >> >> -Olof > > Most of the Exynos4210 device tree support can be reused for > Exynos4412 as well. Looking at the hardware differences between the > two, it might be better to create a new exynos4.dtsi file (kind of > creating it out of the existing exynos4210.dtsi) which will have all > the common bits across all SoC's in the Exynos4 family. > > Further, there can be exynos4210.dtsi and exynos4412.dtsi which would > specify SoC specific differences such as the GIC cpu-offset property > and the additional groups available in the interrupt combiner. > > There are differences in the gpio/pinmux controllers as well which > have to be described using device tree. The current gpio/pinmux device > tree support depends entirely on the gpio-samsung driver which handles > both gpio and pinmux but requires listing all the banks available in > Exynos4412. I would prefer not to do that since we are switching over > to using a pin controller driver and I am currently working on this > driver. > > The pin controller driver is important without which the > gpio/pinmux/pinconf setting for devices such as i2c and sdhci > controller cannot be setup. The basic pinctrl driver for Exynos4 has > already been posted and now I am working on adding gpio and wakeup > interrupt support into that driver (hoping to complete it this week). > > So the probable steps in getting started with using device tree for > Exynos4412 would be > > 1. Create a new exynos4.dtsi file with all the Exynos4 common > properties for all dt supported controllers. > 2. Update the exynos4210.dtsi file accordingly and add the new > exynos4412.dtsi file. > 3. With this, it will be possible to boot the kernel and test > peripherals that do not depend on gpio/pinmux (rtc, wdt, etc). > 4. When the Exynos4 pinctrl driver is available, start adding device > nodes for i2c and sdhci controllers. > 5. Incrementally add device tree coverage for the board and other > peripherals on Exynos4412. Nice! Good plan as I thnk. Thank you, Kyungmin Park -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: 회신: 회신: [PATCH] ODROID-X: hkdk4412: Add new hardware based on Exynos4412
On 7 August 2012 07:58, Olof Johansson wrote: > Hi, > > On Mon, Aug 6, 2012 at 7:05 PM, Dongjin Kim > wrote: >> Hello, >> >> I am trying to understand what I have to do for device tree. >> >> In order to create dts file for ODROID-X hardware, it seems I may need dts >> file of EXYNOS4412 SoC. >> But maybe exynos4412.dtsi is not merged yet or not exist, like >> exynos4210.dtsi or exynos5250.dtsi. >> Obviously it seems not easy to create such a file without SoC datasheet, and >> I do not have it. >> >> So do I wait for the file to be merged by Samsung or better to create >> initial dts file cloned from exynos4210.dtsi and modify to have verified >> nodes with the source/header files? > > Ideally they already have one waiting to be submitted, but that might > not be the case. Given that the origenboard design with 4412 is not > yet shipping, I'm guessing the Linaro Samsung engineers might not have > done much work on 4412 yet. Kukjin? Thomas? > >> What's your suggestion? > > The alternative is to use the data you have available -- i.e. sources > and patches, and craft the device tree from there. The design of 4412 > is a derivative from 4210, so that's a good start. Next step would be > to describe the board on top of the SoC, peripherals, etc. Take a look > at how the origen board support was added, and so on. > > I ordered an odroid-x several weeks ago but I haven't have a confirmed > shipping date yet. :( I'm not sure how long it'll be before I can help > out, unfortunately. > > > -Olof Most of the Exynos4210 device tree support can be reused for Exynos4412 as well. Looking at the hardware differences between the two, it might be better to create a new exynos4.dtsi file (kind of creating it out of the existing exynos4210.dtsi) which will have all the common bits across all SoC's in the Exynos4 family. Further, there can be exynos4210.dtsi and exynos4412.dtsi which would specify SoC specific differences such as the GIC cpu-offset property and the additional groups available in the interrupt combiner. There are differences in the gpio/pinmux controllers as well which have to be described using device tree. The current gpio/pinmux device tree support depends entirely on the gpio-samsung driver which handles both gpio and pinmux but requires listing all the banks available in Exynos4412. I would prefer not to do that since we are switching over to using a pin controller driver and I am currently working on this driver. The pin controller driver is important without which the gpio/pinmux/pinconf setting for devices such as i2c and sdhci controller cannot be setup. The basic pinctrl driver for Exynos4 has already been posted and now I am working on adding gpio and wakeup interrupt support into that driver (hoping to complete it this week). So the probable steps in getting started with using device tree for Exynos4412 would be 1. Create a new exynos4.dtsi file with all the Exynos4 common properties for all dt supported controllers. 2. Update the exynos4210.dtsi file accordingly and add the new exynos4412.dtsi file. 3. With this, it will be possible to boot the kernel and test peripherals that do not depend on gpio/pinmux (rtc, wdt, etc). 4. When the Exynos4 pinctrl driver is available, start adding device nodes for i2c and sdhci controllers. 5. Incrementally add device tree coverage for the board and other peripherals on Exynos4412. Thanks, Thomas. -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: 회신: 회신: [PATCH] ODROID-X: hkdk4412: Add new hardware based on Exynos4412
Hi, On Mon, Aug 6, 2012 at 7:05 PM, Dongjin Kim wrote: > Hello, > > I am trying to understand what I have to do for device tree. > > In order to create dts file for ODROID-X hardware, it seems I may need dts > file of EXYNOS4412 SoC. > But maybe exynos4412.dtsi is not merged yet or not exist, like > exynos4210.dtsi or exynos5250.dtsi. > Obviously it seems not easy to create such a file without SoC datasheet, and > I do not have it. > > So do I wait for the file to be merged by Samsung or better to create initial > dts file cloned from exynos4210.dtsi and modify to have verified nodes with > the source/header files? Ideally they already have one waiting to be submitted, but that might not be the case. Given that the origenboard design with 4412 is not yet shipping, I'm guessing the Linaro Samsung engineers might not have done much work on 4412 yet. Kukjin? Thomas? > What's your suggestion? The alternative is to use the data you have available -- i.e. sources and patches, and craft the device tree from there. The design of 4412 is a derivative from 4210, so that's a good start. Next step would be to describe the board on top of the SoC, peripherals, etc. Take a look at how the origen board support was added, and so on. I ordered an odroid-x several weeks ago but I haven't have a confirmed shipping date yet. :( I'm not sure how long it'll be before I can help out, unfortunately. -Olof -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
