linux-kernel - Re: [PATCH] ARM: dts: omap5-igep0050: Correct hdmi regulator

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Date:	Mon, 9 May 2016 11:25:53 +0300
From:	Peter Ujfalusi <peter.ujfalusi@...com>
To:	Tony Lindgren <tony@...mide.com>, Nishanth Menon <nm@...com>,
	"Valkeinen, Tomi" <tomi.valkeinen@...com>
CC:	<linux-omap@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>,
	Enric Balletbo i Serra <eballetbo@...ebcn.com>,
	Agustí Fontquerni <af@...ebcn.com>,
	Eduard Gavin <egavin@...ebcn.com>
Subject: Re: [PATCH] ARM: dts: omap5-igep0050: Correct hdmi regulator

Adding Tomi,

On 05/05/16 21:46, Tony Lindgren wrote:
> * Nishanth Menon <nm@...com> [160504 11:03]:
>> On 05/04/2016 12:26 PM, Tony Lindgren wrote:
>>> Hi,
>>>
>>> Adding Nishanth to Cc.
>>>
>>> * Peter Ujfalusi <peter.ujfalusi@...com> [160429 05:15]:
>>>> ldo7_reg, obviously ;)
>>>>
>>>>> 	status = "okay";
>>>>> 	regulator-min-microvolt = <1800000>;
>>>>> 	regulator-max-microvolt = <1800000>;
>>>>> };
>>>
>>> It really seems to be ldo7, otherwise there's no HDMI output. I don't
>>> have the schematics either.
>>>
>>> But it seems we have at least two other regressions in Linux next that
>>> prevent me from testing this properly:
>>>
>>> 1. On igepv5, I get this for the MMC regulator
>>>
>>> ldo9: bypassed regulator has no supply!
>>> ldo9: failed to get the current voltage(-517)
>>> palmas-pmic 48070000.i2c:palmas@48:palmas_pmic: failed to register 48070000.i2c:palmar
> 
> The patch I posted fixes this. Then for the HDMI see below.
> I've kept it at 2V like we have in omap5-board-common.dtsi,
> I wonder if it really should be 1.8V though for ldo7 in this
> case?

AFAIK the VDDA for the HDMI needs to be 1.8V along with other VDDAs for DSS
(vdda_dsiporta, vdda_dsiportc and vdda_hdmi).

Tomi: what do you think?

According to the OMAP5 data manual the vdda_hdmi can be in 1.5V or 1.8V mode,
2V is not mentioned in the recommended operating conditions table.

Just to note: on omap5-uevm the ldo7 is connected to VPP1 of OMAP5 (eFuse
power supply), which does require 2V.


> Regards,
> 
> Tony
> 8< -----------------
> From: Tony Lindgren <tony@...mide.com>
> Date: Thu, 5 May 2016 11:29:23 -0700
> Subject: [PATCH] ARM: dts: Fix ldo7 source for HDMI on igepv5
> 
> Fix ldo7 source for HDMI on igepv5.
> 
> Suggested-by: Peter Ujfalusi <peter.ujfalusi@...com>
> Signed-off-by: Tony Lindgren <tony@...mide.com>
> 
> diff --git a/arch/arm/boot/dts/omap5-igep0050.dts b/arch/arm/boot/dts/omap5-igep0050.dts
> index 46ecb1d..72ff6a4 100644
> --- a/arch/arm/boot/dts/omap5-igep0050.dts
> +++ b/arch/arm/boot/dts/omap5-igep0050.dts
> @@ -35,6 +35,12 @@
>  	};
>  };
>  
> +&ldo7_reg {
> +	status = "okay";
> +	regulator-min-microvolt = <2000000>;
> +	regulator-max-microvolt = <2000000>;

If we are not changing the default voltage set in the common dtsi file we only
need to status = "okay"

> +};
> +
>  &omap5_pmx_core {
>  	i2c4_pins: pinmux_i2c4_pins {
>  		pinctrl-single,pins = <
> 


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