LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Icenowy Zheng <icenowy@aosc.io>
To: Andre Przywara <andre.przywara@arm.com>,
	Ulf Hansson <ulf.hansson@linaro.org>,
	Rob Herring <robh+dt@kernel.org>,
	Maxime Ripard <maxime.ripard@bootlin.com>,
	Chen-Yu Tsai <wens@csie.org>
Cc: linux-mmc@vger.kernel.org, devicetree@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, linux-sunxi@googlegroups.com
Subject: Re: [linux-sunxi] [PATCH 3/3] arm64: allwinner: h6: enable MMC0/2 on Pine H64
Date: Fri, 27 Apr 2018 15:12:42 +0800	[thread overview]
Message-ID: <83EDF187-5EB2-4FEB-99BC-9D5B728D3A45@aosc.io> (raw)
In-Reply-To: <03cc2e8c-4a35-3fb4-b408-fd8d4ba3e407@arm.com>



于 2018年4月27日 GMT+08:00 上午12:46:26, Andre Przywara <andre.przywara@arm.com> 写到:
>Hi,
>
>On 26/04/18 15:07, Icenowy Zheng wrote:
>> The Pine H64 board have a MicroSD slot connected to MMC0 controller
>of
>> the H6 SoC and a eMMC slot connected to MMC2.
>> 
>> Enable them in the device tree.
>> 
>> Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
>> ---
>>  .../boot/dts/allwinner/sun50i-h6-pine-h64.dts      | 32
>++++++++++++++++++++++
>>  1 file changed, 32 insertions(+)
>> 
>> diff --git a/arch/arm64/boot/dts/allwinner/sun50i-h6-pine-h64.dts
>b/arch/arm64/boot/dts/allwinner/sun50i-h6-pine-h64.dts
>> index d36de5eb81f3..78b1cd54687c 100644
>> --- a/arch/arm64/boot/dts/allwinner/sun50i-h6-pine-h64.dts
>> +++ b/arch/arm64/boot/dts/allwinner/sun50i-h6-pine-h64.dts
>> @@ -20,6 +20,38 @@
>>  	chosen {
>>  		stdout-path = "serial0:115200n8";
>>  	};
>> +
>> +	reg_vcc3v3: vcc3v3 {
>> +		compatible = "regulator-fixed";
>> +		regulator-name = "vcc3v3";
>> +		regulator-min-microvolt = <3300000>;
>> +		regulator-max-microvolt = <3300000>;
>> +	};
>> +
>> +	reg_vcc1v8: vcc1v8 {
>> +		compatible = "regulator-fixed";
>> +		regulator-name = "vcc1v8";
>> +		regulator-min-microvolt = <1800000>;
>> +		regulator-max-microvolt = <1800000>;
>> +	};
>> +};
>> +
>> +&mmc0 {
>> +	pinctrl-names = "default";
>> +	pinctrl-0 = <&mmc0_pins>;
>> +	vmmc-supply = <&reg_vcc3v3>;
>
>So this is actually CLDO1 on the AXP, correct?

I remember it's coupled between two LDOs, to provide enough power.

>
>
>> +	cd-gpios = <&pio 5 6 GPIO_ACTIVE_LOW>;
>> +	status = "okay";
>> +};
>> +
>> +&mmc2 {
>> +	pinctrl-names = "default";
>> +	pinctrl-0 = <&mmc2_pins>;
>> +	vmmc-supply = <&reg_vcc3v3>;
>> +	vqmmc-supply = <&reg_vcc1v8>;
>
>And this is BLDO2?

Yes.

>
>I am just asking because I want to avoid running into the same problem
>as with the A64 before: that future DTs become incompatible with older
>kernels, because we change the power supply to point to the AXP
>regulators, which this kernel does not support yet.

The answer is just not to keep this compatibility, as it's not
supported option to update DT without updating kernel.

P.S. I think the DT will update twice on the kernel side, the
first time keep reg_vcc3v3 (as it's coupled) but use real
regulator for reg_vcc1v8, the second time use the real
coupled regulator for reg_vcc3v3.

>
>It looks like there are more users of those power rails, so we could
>keep those supplies connected to these fixed regulators here, even with
>AXP-805 support in the kernel.

It's not a good choice.

>
>Or we keep this back until we get proper AXP support in the kernel? I
>guess it's quite close to the existing PMICs, so it might be more a
>copy&paste exercise to support the AXP-805?

It's not a reason to keep it back.

>
>But apart from this this looks correct to me.
>
>Cheers,
>Andre.
>
>> +	non-removable;
>> +	cap-mmc-hw-reset;
>> +	status = "okay";
>>  };
>>  
>>  &uart0 {
>> 

  reply	other threads:[~2018-04-27  7:13 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-26 14:07 [PATCH 0/3] Enable basic MMC support on Allwinner H6 Icenowy Zheng
2018-04-26 14:07 ` [PATCH 1/3] mmc: sunxi: add support for the MMC controller on H6 Icenowy Zheng
2018-04-26 16:45   ` [linux-sunxi] " Andre Przywara
2018-04-27  8:38     ` Icenowy Zheng
2018-04-27  9:23       ` Andre Przywara
2018-05-02 12:54   ` Ulf Hansson
2018-04-26 14:07 ` [PATCH 2/3] arm64: allwinner: h6: add device tree nodes for MMC controllers Icenowy Zheng
2018-04-26 16:45   ` [linux-sunxi] " Andre Przywara
2018-04-27  8:36     ` Icenowy Zheng
2018-04-27  9:18       ` Andre Przywara
2018-04-27  9:23         ` Icenowy Zheng
2018-04-27 21:25           ` André Przywara
2018-06-26  0:28             ` Icenowy Zheng
2018-04-26 14:07 ` [PATCH 3/3] arm64: allwinner: h6: enable MMC0/2 on Pine H64 Icenowy Zheng
2018-04-26 16:46   ` [linux-sunxi] " Andre Przywara
2018-04-27  7:12     ` Icenowy Zheng [this message]
2018-04-30  9:47       ` Andre Przywara
2018-04-30  9:51         ` Icenowy Zheng
2018-04-30 10:44           ` Andre Przywara
2018-05-01 15:52             ` Chen-Yu Tsai
2018-05-02 11:01               ` Andre Przywara
2018-05-04  2:44                 ` Chen-Yu Tsai
2018-05-01 15:48         ` Chen-Yu Tsai
2018-05-02  9:36         ` Maxime Ripard
2018-05-02 11:01           ` Andre Przywara
2018-05-03 18:05             ` Maxime Ripard

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=83EDF187-5EB2-4FEB-99BC-9D5B728D3A45@aosc.io \
    --to=icenowy@aosc.io \
    --cc=andre.przywara@arm.com \
    --cc=devicetree@vger.kernel.org \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mmc@vger.kernel.org \
    --cc=linux-sunxi@googlegroups.com \
    --cc=maxime.ripard@bootlin.com \
    --cc=robh+dt@kernel.org \
    --cc=ulf.hansson@linaro.org \
    --cc=wens@csie.org \
    --subject='Re: [linux-sunxi] [PATCH 3/3] arm64: allwinner: h6: enable MMC0/2 on Pine H64' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).