Hi Sylwester, On Wed, Jul 17, 2013 at 2:53 AM, Sylwester Nawrocki <sylvester.nawrocki@xxxxxxxxx> wrote: > Hi Arun, > > > On 07/09/2013 01:08 PM, Arun Kumar K wrote: >> >> On Fri, Jun 21, 2013 at 4:15 AM, Sylwester Nawrocki >> <sylvester.nawrocki@xxxxxxxxx> wrote: >>> >>> On 05/31/2013 03:03 PM, Arun Kumar K wrote: > > [...] > >>>> Signed-off-by: Arun Kumar K<arun.kk@xxxxxxxxxxx> >>>> --- >>>> .../devicetree/bindings/media/exynos5-fimc-is.txt | 41 >>>> ++++++++++++++++++++ >>>> 1 file changed, 41 insertions(+) >>>> create mode 100644 >>>> Documentation/devicetree/bindings/media/exynos5-fimc-is.txt >>>> >>>> diff --git a/Documentation/devicetree/bindings/media/exynos5-fimc-is.txt >>>> b/Documentation/devicetree/bindings/media/exynos5-fimc-is.txt >>>> new file mode 100644 >>>> index 0000000..9fd4646 >>>> --- /dev/null >>>> +++ b/Documentation/devicetree/bindings/media/exynos5-fimc-is.txt >>>> @@ -0,0 +1,41 @@ > > [...] > >>>> +----------------------------------- >>>> + >>>> +The camera subsystem on Samsung Exynos5 SoC has some changes relative >>>> +to previous SoC versions. Exynos5 has almost similar MIPI-CSIS and >>>> +FIMC-LITE IPs but has a much improved version of FIMC-IS which can >>>> +handle sensor controls and camera post-processing operations. The >>>> +Exynos5 FIMC-IS has a dedicated ARM Cortex A5 processor, many >>>> +post-processing blocks (ISP, DRC, FD, ODC, DIS, 3DNR) and two >>>> +dedicated scalers (SCC and SCP). >>>> + >>>> +fimc-is node >>>> +------------ >>>> + >>>> +Required properties: >>>> + >>>> +- compatible : must be "samsung,exynos5250-fimc-is" >>>> +- reg : physical base address and size of the memory >>>> mapped >>>> + registers >>>> +- interrupt-parent : Parent interrupt controller >>>> +- interrupts : fimc-is interrupt to the parent combiner >>>> +- clocks : list of clock specifiers, corresponding to >>>> entries >>>> in >>>> + clock-names property; >>>> +- clock-names : must contain "isp", "mcu_isp", "isp_div0", >>>> "isp_div1", >>>> + "isp_divmpwm", "mcu_isp_div0", "mcu_isp_div1" >>>> entries, >>>> + matching entries in the clocks property. >>>> + >>>> + >>>> +Board specific properties: >>>> + >>>> +- pinctrl-names : pinctrl names for camera port pinmux control, at >>>> least >>>> + "default" needs to be specified. >>>> +- pinctrl-0...N : pinctrl properties corresponding to >>>> pinctrl-names >>> >>> >>> >>> What pins exactly are supposed to be covered by these properties ? For >>> what >>> devices ? Aren't the camera port pins supposed to be specified at the >>> common >>> 'camera' node ? I believe the camera ports are not specific to the >>> FIMC-IS. >> >> >> These are for the sensor controls (especially clock lines). >> I think I should move these to the sensor node. > > > This doesn't sound right either. These pins are not a property of an > external > image sensor device, they are specific to the AP SoC. So IMO these pinctrl > properties belong to some SoC's internal device node. > Ok. Time being I will move it to the camera node pinctrl properties. > I think we could add a clock provider for the sclk_cam clocks and then the > pinmux of those clock outputs could be configurable from with the clock ops. > E.g. we set the pinumx into CAM_?_CLKOUT function only when a clock is > enabled. > Disabling a clock would put CLKOUT pin pinmux e.g. into input with pull down > state. This would ensure proper CLKOUT pin configuration when image sensor > is > suspended or entirely powered off. I'm working on something like this for > exynos4. > Ok that would be great. I will refer your exynos4 implementation for doing this. > >>>> +pmu subnode >>>> +----------- >>>> + >>>> +Required properties: >>>> + - reg : should contain PMU physical base address and size of the >>>> memory >>>> + mapped registers. >>> >>> >>> >>> What about other devices, like ISP I2C, SPI ? Don't you want to list at >>> least >>> the ones currently used (I2C bus controllers) ? >>> >> >> The present driver doesnt make use of the SPI bus as its used only >> for sensor calibration which is not yet added. > > > Is it only going to be used by the Cortex-A5 firmware, similarly to the > I2C bus ? If so then it is likely not needed to specify it here right now. > But I believe for complete H/W description we should reserve a possibility > to add those various peripheral device nodes here. > Yes its going to be used by the firmware and is done for sensor calibration. The sensor works well even without it and so I didnt include it in my initial patchset and kept it as a todo. > >> I2C bus is used by the sensor which has its own node. May be I should >> explain one of the sensor nodes over here? > > > I would describe at least I2C bus controller node and add a note that image > sensor nodes can be specified there. > I havent created a dummy i2c device driver for handling the i2c clock part and everything was handled in the fimc-is-sensor itself. I was checking your exynos4 implementation and will try to do in similar lines. > Also, it would be good to start adding separate sensor drivers for each > sensor, like s5k6a3, s5k4e3, etc. Ideally we should not have duplicated > fimc-is-sensor.[ch] that would handle various sensors, i.e. same set of > sensors to drivers/media/platform/exynos4-is and drivers/media/platform/ > exynos5-is. > Yes I hope it can be re-used. > After you post the next iteration of this series I could have a look how > it could be done. > Ok thanks. Regards Arun -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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