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. >>> + 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? Maybe better option is to use pinctrl for these gpios, or use gpio regulator, hard to guess without documentation. Regards Andrzej -- 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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