linux-kernel - Re: [PATCH v2 4/4] arm64: dts: allwinner: h6: Use RSB for AXP805 PMIC connection

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Message-ID: <b8d302da-9268-90ee-35b4-91971ccd460a@sholland.org>
Date:   Mon, 4 Jan 2021 21:31:42 -0600
From:   Samuel Holland <samuel@...lland.org>
To:     André Przywara <andre.przywara@....com>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Rob Herring <robh+dt@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Philipp Zabel <p.zabel@...gutronix.de>
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-clk@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-sunxi@...glegroups.com
Subject: Re: [PATCH v2 4/4] arm64: dts: allwinner: h6: Use RSB for AXP805 PMIC
 connection

On 1/4/21 4:54 AM, André Przywara wrote:
> On 03/01/2021 10:00, Samuel Holland wrote:
>> On boards where the only peripheral connected to PL0/PL1 is an X-Powers
>> PMIC, configure the connection to use the RSB bus rather than the I2C
>> bus. Compared to the I2C controller that shares the pins, the RSB
>> controller allows a higher bus frequency, and it is more CPU-efficient.
> 
> But is it really necessary to change the DTs for those boards in this
> way? It means those newer DTs now become incompatible with older
> kernels, and I don't know if those reasons above really justify this.
> 
> I understand that we officially don't care about "newer DTs on older
> kernels", but do we really need to break this deliberately, for no
> pressing reasons?

That's a reasonable concern. I am fine if you want to delay or drop patch 4.

Cheers,
Samuel

> Cheers,
> Andre
> 
> P.S. I am fine with supporting RSB on H6, and even using it on new DTs,
> just want to avoid breaking existing ones.
> 
>> Signed-off-by: Samuel Holland <samuel@...lland.org>
>> ---
>>  .../dts/allwinner/sun50i-h6-beelink-gs1.dts   | 38 +++++++++----------
>>  .../dts/allwinner/sun50i-h6-orangepi-3.dts    | 14 +++----
>>  .../dts/allwinner/sun50i-h6-orangepi.dtsi     | 22 +++++------
>>  3 files changed, 37 insertions(+), 37 deletions(-)
>>
>> diff --git a/arch/arm64/boot/dts/allwinner/sun50i-h6-beelink-gs1.dts b/arch/arm64/boot/dts/allwinner/sun50i-h6-beelink-gs1.dts
>> index 7c9dbde645b5..3452add30cc4 100644
>> --- a/arch/arm64/boot/dts/allwinner/sun50i-h6-beelink-gs1.dts
>> +++ b/arch/arm64/boot/dts/allwinner/sun50i-h6-beelink-gs1.dts
>> @@ -150,12 +150,28 @@ &pio {
>>  	vcc-pg-supply = <&reg_aldo1>;
>>  };
>>  
>> -&r_i2c {
>> +&r_ir {
>> +	linux,rc-map-name = "rc-beelink-gs1";
>> +	status = "okay";
>> +};
>> +
>> +&r_pio {
>> +	/*
>> +	 * FIXME: We can't add that supply for now since it would
>> +	 * create a circular dependency between pinctrl, the regulator
>> +	 * and the RSB Bus.
>> +	 *
>> +	 * vcc-pl-supply = <&reg_aldo1>;
>> +	 */
>> +	vcc-pm-supply = <&reg_aldo1>;
>> +};
>> +
>> +&r_rsb {
>>  	status = "okay";
>>  
>> -	axp805: pmic@36 {
>> +	axp805: pmic@745 {
>>  		compatible = "x-powers,axp805", "x-powers,axp806";
>> -		reg = <0x36>;
>> +		reg = <0x745>;
>>  		interrupt-parent = <&r_intc>;
>>  		interrupts = <0 IRQ_TYPE_LEVEL_LOW>;
>>  		interrupt-controller;
>> @@ -273,22 +289,6 @@ sw {
>>  	};
>>  };
>>  
>> -&r_ir {
>> -	linux,rc-map-name = "rc-beelink-gs1";
>> -	status = "okay";
>> -};
>> -
>> -&r_pio {
>> -	/*
>> -	 * PL0 and PL1 are used for PMIC I2C
>> -	 * don't enable the pl-supply else
>> -	 * it will fail at boot
>> -	 *
>> -	 * vcc-pl-supply = <&reg_aldo1>;
>> -	 */
>> -	vcc-pm-supply = <&reg_aldo1>;
>> -};
>> -
>>  &rtc {
>>  	clocks = <&ext_osc32k>;
>>  };
>> diff --git a/arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi-3.dts b/arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi-3.dts
>> index 15c9dd8c4479..16702293ac0b 100644
>> --- a/arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi-3.dts
>> +++ b/arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi-3.dts
>> @@ -175,12 +175,16 @@ &pio {
>>  	vcc-pg-supply = <&reg_vcc_wifi_io>;
>>  };
>>  
>> -&r_i2c {
>> +&r_ir {
>> +	status = "okay";
>> +};
>> +
>> +&r_rsb {
>>  	status = "okay";
>>  
>> -	axp805: pmic@36 {
>> +	axp805: pmic@745 {
>>  		compatible = "x-powers,axp805", "x-powers,axp806";
>> -		reg = <0x36>;
>> +		reg = <0x745>;
>>  		interrupt-parent = <&r_intc>;
>>  		interrupts = <0 IRQ_TYPE_LEVEL_LOW>;
>>  		interrupt-controller;
>> @@ -291,10 +295,6 @@ sw {
>>  	};
>>  };
>>  
>> -&r_ir {
>> -	status = "okay";
>> -};
>> -
>>  &rtc {
>>  	clocks = <&ext_osc32k>;
>>  };
>> diff --git a/arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi.dtsi
>> index ebc120a9232f..23e3cb2ffd8d 100644
>> --- a/arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi.dtsi
>> +++ b/arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi.dtsi
>> @@ -112,12 +112,20 @@ &pio {
>>  	vcc-pg-supply = <&reg_aldo1>;
>>  };
>>  
>> -&r_i2c {
>> +&r_ir {
>> +	status = "okay";
>> +};
>> +
>> +&r_pio {
>> +	vcc-pm-supply = <&reg_bldo3>;
>> +};
>> +
>> +&r_rsb {
>>  	status = "okay";
>>  
>> -	axp805: pmic@36 {
>> +	axp805: pmic@745 {
>>  		compatible = "x-powers,axp805", "x-powers,axp806";
>> -		reg = <0x36>;
>> +		reg = <0x745>;
>>  		interrupt-parent = <&r_intc>;
>>  		interrupts = <0 IRQ_TYPE_LEVEL_LOW>;
>>  		interrupt-controller;
>> @@ -232,14 +240,6 @@ sw {
>>  	};
>>  };
>>  
>> -&r_ir {
>> -	status = "okay";
>> -};
>> -
>> -&r_pio {
>> -	vcc-pm-supply = <&reg_bldo3>;
>> -};
>> -
>>  &rtc {
>>  	clocks = <&ext_osc32k>;
>>  };
>>
>