On Wed, Mar 4, 2015 at 2:30 PM, Andrzej Hajda <a.hajda@xxxxxxxxxxx> wrote: > On 03/02/2015 09:40 AM, Ajay kumar wrote: >> Hi Andrej, >> >> On Fri, Feb 27, 2015 at 4:18 PM, Andrzej Hajda <a.hajda@xxxxxxxxxxx> wrote: >>> Hi Ajay, >>> >>> Thanks for the patch. >> Thanks for reviewing the patch. >> >>> On 02/26/2015 04:24 PM, Ajay Kumar wrote: >>>> Modify the exynos HDMI driver to support Exynos7 HDMI 1.4. >>>> * Add phy configs for Exynos7. >>>> * Exynos7 has a different clock structure for HDMI, >>>> so introduce the new clocks. >>>> * Add sysreg support to enable HDMI SYSREG on Exynos7. >>>> * Exynos7 based boards need a DCDC_EN and LS_EN pins >>>> for powering up HDMI. Add support for that too. >>>> >>>> Signed-off-by: Ajay Kumar <ajaykumar.rs@xxxxxxxxxxx> >>>> --- >>>> .../devicetree/bindings/video/exynos_hdmi.txt | 21 +- >>>> drivers/gpu/drm/exynos/exynos_hdmi.c | 252 ++++++++++++++++---- >>>> drivers/gpu/drm/exynos/regs-hdmi.h | 4 + >>>> 3 files changed, 231 insertions(+), 46 deletions(-) >>>> >>>> diff --git a/Documentation/devicetree/bindings/video/exynos_hdmi.txt b/Documentation/devicetree/bindings/video/exynos_hdmi.txt >>>> index 1fd8cf9..bb22a60 100644 >>>> --- a/Documentation/devicetree/bindings/video/exynos_hdmi.txt >>>> +++ b/Documentation/devicetree/bindings/video/exynos_hdmi.txt >>>> @@ -6,6 +6,7 @@ Required properties: >>>> 2) "samsung,exynos4210-hdmi" >>>> 3) "samsung,exynos4212-hdmi" >>>> 4) "samsung,exynos5420-hdmi" >>>> + 5) "samsung,exynos7-hdmi" >>> Why not "samsung,exynos7420-hdmi" ? >>> What compatible will you use for Exynos7430 or higher chip number? >> I will leave this decision to Inki Dae or Kukjin. >> >>>> - reg: physical base address of the hdmi and length of memory mapped >>>> region. >>>> - interrupts: interrupt number to the cpu. >>>> @@ -15,21 +16,33 @@ Required properties: >>>> c) optional flags and pull up/down. >>>> - clocks: list of clock IDs from SoC clock driver. >>>> a) hdmi: Gate of HDMI IP bus clock. >>>> - b) sclk_hdmi: Gate of HDMI special clock. >>>> - c) sclk_pixel: Pixel special clock, one of the two possible inputs of >>>> + HDMI clocks necessary for non exynos7: >>>> + b) sclk_hdmi: Gate of HDMI special clock. >>>> + c) sclk_pixel: Pixel special clock, one of the two possible inputs of >>>> HDMI clock mux. >>>> - d) sclk_hdmiphy: HDMI PHY clock output, one of two possible inputs of >>>> + d) sclk_hdmiphy: HDMI PHY clock output, one of two possible inputs of >>>> HDMI clock mux. >>>> - e) mout_hdmi: It is required by the driver to switch between the 2 >>>> + e) mout_hdmi: It is required by the driver to switch between the 2 >>>> parents i.e. sclk_pixel and sclk_hdmiphy. If hdmiphy is stable >>>> after configuration, parent is set to sclk_hdmiphy else >>>> sclk_pixel. >>>> + HDMI clocks necessary for Exynos7: >>>> + b) pclk_hdmiphy: Gate to HDMIPHY clock. >>> According to specs there is also pclk_hdmi, why do you specify only this >>> one? >> Right, I have reused "hdmi" gating clock for pclk_hdmi. That is why I have >> left "hdmi" clock as common for exynos7 and non-exynos7. > > IMO it would be better to use separate entry for pclk_hdmi. Ok. >>>> + c) hdmi_pixel: Gate clock of MUX output for I_PIXEL_CLK. >>>> + d) hdmi_tmds: Gate clock of MUX output for I_TMDS_CLK. >>> According to specs these clocks should be named i_pixel_clk and >>> i_tmds_clk, shouldn't they? >> I actually took these changes from an "internal" code(non-DRM). >> The original author used these names, and I just carried the same names. :) >> >>>> - clock-names: aliases as per driver requirements for above clock IDs: >>>> "hdmi", "sclk_hdmi", "sclk_pixel", "sclk_hdmiphy" and "mout_hdmi". >>>> - ddc: phandle to the hdmi ddc node >>>> - phy: phandle to the hdmi phy node >>>> - samsung,syscon-phandle: phandle for system controller node for PMU. >>>> >>>> +Only for Exynos7(when compatible = "samsung,exynos7-hdmi"): >>>> +- samsung,sysreg-phandle: phandle for system controller node for SYSREG block. >>>> + >>>> +Optional properties: >>>> +- dcdc-gpios: OF device-tree gpio specification for HDMI_DCDC_EN pin. >>>> +- lsen-gpios: OF device-tree gpio specification for HDMI_LS_EN pin. >>> What is purpose of these gpios? >> These 2 GPIOs need to be enabled to powerup HDMI on exynos7-espresso board. >> Other boards need not provide the GPIO. > > HDMI is internal IP of SoC, so it is rather not configurable via pins. > Pin names suggests they are for DC-DC converter and level shifter, I guess > these are for HDMI connector, not the HDMI IP, am I right? Right, this is for HDMI connector. > Maybe better option is to use pinctrl for these gpios, or use gpio > regulator, hard > to guess without documentation. Why should I not use devm_gpiod_get_optional for these GPIOs? Ajay -- 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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