linux-kernel - Re: [PATCH] ARM: dts: rockchip: correct regular setting for act8846

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Date:   Wed, 24 May 2017 11:26:10 +0100
From:   Robin Murphy <robin.murphy@....com>
To:     Heiko Stuebner <heiko@...ech.de>,
        Eddie Cai <eddie.cai.linux@...il.com>
Cc:     mark.rutland@....com, devicetree@...r.kernel.org,
        linux@...linux.org.uk, linux-kernel@...r.kernel.org,
        linux-rockchip@...ts.infradead.org, robh+dt@...nel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] ARM: dts: rockchip: correct regular setting for act8846

On 24/05/17 09:17, Heiko Stuebner wrote:
> Hi Eddie,
> 
> Am Mittwoch, 24. Mai 2017, 15:33:41 CEST schrieb Eddie Cai:
>> the previous setting of act8846 is just copy from firefly board. but
>> the reload board is a little different from firefly board. let's correct
>> it.
>>
>> Signed-off-by: Eddie Cai <eddie.cai.linux@...il.com>
>> ---
>>  arch/arm/boot/dts/rk3288-firefly-reload-core.dtsi | 21 +++++++++++----------
>>  1 file changed, 11 insertions(+), 10 deletions(-)
>>
>> diff --git a/arch/arm/boot/dts/rk3288-firefly-reload-core.dtsi b/arch/arm/boot/dts/rk3288-firefly-reload-core.dtsi
>> index 8134966..4cfa109 100644
>> --- a/arch/arm/boot/dts/rk3288-firefly-reload-core.dtsi
>> +++ b/arch/arm/boot/dts/rk3288-firefly-reload-core.dtsi
>> @@ -179,6 +179,7 @@
>>  				regulator-name = "vccio_sd";
>>  				regulator-min-microvolt = <3300000>;
>>  				regulator-max-microvolt = <3300000>;
>> +				regulator-always-on;
> 
> the rest below looks pretty straight forward, but why does vccio_sd
> need to be always on?
> 
> I've checked the reload's schematics but did not find any further users
> of vccio_sd that may warant this attribute.

It looks like the card detect line is pulled up externally to vcc_sd,
which isn't always-on either, so you probably do want this - on the
(unrelated) rk3288 TV box I've been hacking on, I discovered that
powering off the sdmmc-supply domain also kills the internal pull-up and
leaves sdmmc_cd floating. The resulting stochastic card polling
mechanism is amusing, but probably undesirable ;)

Robin.

> 
> 
> Heiko
> 
> 
>>  			};
>>  
>>  			vdd10_lcd: REG6 {
>> @@ -187,24 +188,23 @@
>>  				regulator-max-microvolt = <1000000>;
>>  			};
>>  
>> -			vcca_18: REG7  {
>> -				regulator-name = "vcca_18";
>> -				regulator-min-microvolt = <1800000>;
>> -				regulator-max-microvolt = <1800000>;
>> -				regulator-always-on;
>> +			vcca_33: REG7  {
>> +				regulator-name = "vcca_33";
>> +				regulator-min-microvolt = <3300000>;
>> +				regulator-max-microvolt = <3300000>;
>>  			};
>>  
>> -			vcca_33: REG8 {
>> -				regulator-name = "vcca_33";
>> +			vcc_lan: REG8 {
>> +				regulator-name = "vcc_lan";
>>  				regulator-min-microvolt = <3300000>;
>>  				regulator-max-microvolt = <3300000>;
>> -				regulator-always-on;
>>  			};
>>  
>> -			vcc_lan: REG9 {
>> -				regulator-name = "vcca_lan";
>> +			vccio_pmu: REG9 {
>> +				regulator-name = "vccio_pmu";
>>  				regulator-min-microvolt = <3300000>;
>>  				regulator-max-microvolt = <3300000>;
>> +				regulator-always-on;
>>  			};
>>  
>>  			vdd_10: REG10 {
>> @@ -218,6 +218,7 @@
>>  				regulator-name = "vcc_18";
>>  				regulator-min-microvolt = <1800000>;
>>  				regulator-max-microvolt = <1800000>;
>> +				regulator-always-on;
>>  			};
>>  
>>  			vcc18_lcd: REG12 {
>>
> 
> 
> 
> _______________________________________________
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> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
> 

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