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Date:   Tue, 25 Jul 2023 21:15:20 +0200
From:   Henrik Grimler <henrik@grimler.se>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Cc:     Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Conor Dooley <conor+dt@kernel.org>,
        Alim Akhtar <alim.akhtar@samsung.com>,
        devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org,
        Marek Szyprowski <m.szyprowski@samsung.com>,
        replicant@osuosl.org, phone-devel@vger.kernel.org,
        ~postmarketos/upstreaming@lists.sr.ht,
        Martin =?iso-8859-1?Q?J=FCcker?= <martin.juecker@gmail.com>,
        Artur Weber <aweber.kernel@gmail.com>
Subject: Re: [PATCH v2] ARM: dts: samsung: exynos4412-midas: add USB
 connector and USB OTG
Message-ID: <ZMAfSIF0Rwc69nEv@grimlerstat.localdomain>
References: <20230723142417.97734-1-krzysztof.kozlowski@linaro.org>
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On Sun, Jul 23, 2023 at 04:24:17PM +0200, Krzysztof Kozlowski wrote:
> Add full description of USB-MUIC (MAX77693 MUIC) and MUIC-MHL
> connections, along with proper USB connector and OTG mode for DWC2 USB
> controller.
> 
> This fixes dtc W=1 warnings:
> 
>   Warning (graph_child_address): /i2c-mhl/hdmi-bridge@39/ports: graph node has single child node 'port@0', #address-cells/#size-cells are not necessary
> 
> Cc: Marek Szyprowski <m.szyprowski@samsung.com>
> Cc: replicant@osuosl.org
> Cc: phone-devel@vger.kernel.org
> Cc: ~postmarketos/upstreaming@lists.sr.ht
> Cc: Martin J?cker <martin.juecker@gmail.com>
> Cc: Henrik Grimler <henrik@grimler.se>
> Cc: Artur Weber <aweber.kernel@gmail.com>
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

Tested-by: Henrik Grimler <henrik@grimler.se>

* Peripheral mode (still) works
* MHL somewhat works
* OTG (still) does not work

Further details for those interested:

MHL works reliably if cable is attached before boot, but if cable is
attached on already running device it sometimes work after detaching
and attaching cable a few times.  On cable attach, when it does not
work, we get:

  [  252.831734] max77693-muic max77693-muic: external connector is detached(chg_type:0x0, prev_chg_type:0x0)
  [  253.733916] max77693-muic max77693-muic: external connector is attached(chg_type:0x1, prev_chg_type:0x1)
  [  253.735232] max77693-muic max77693-muic: CONTROL1 : 0x09, CONTROL2 : 0x04, state : attached
  [  254.691877] i2c i2c-15: sendbytes: NAK bailout.
  [  254.692150] sii9234 15-0039: writebm:  TPI[0x3d] <- 0x3e
  [  255.984336] sii9234 15-0039: RGND is not 1k
  [  256.068970] sii9234 15-0039: RSEN_HIGH without RGND_1K
  [  256.104457] sii9234 15-0039: discovery failed, no power for MHL?
  [  256.118272] i2c i2c-15: sendbytes: NAK bailout.
  [  256.118539] sii9234 15-0039: writebm:  TPI[0x3d] <- 0x3e
  [  256.375966] sii9234 15-0039: RSEN_HIGH without RGND_1K
  [  256.411561] sii9234 15-0039: discovery failed, no power for MHL?

while when it works:

  [  175.348307] max77693-muic max77693-muic: external connector is detached(chg_type:0x1, prev_chg_type:0x0)
  [  175.349576] max77693-muic max77693-muic: CONTROL1 : 0x00, CONTROL2 : 0x01, state : detached
  [  179.304373] dwc2 12480000.usb: new device is full-speed
  [  179.305920] max77693-muic max77693-muic: external connector is detached(chg_type:0x0, prev_chg_type:0x0)
  [  180.205735] max77693-muic max77693-muic: external connector is attached(chg_type:0x1, prev_chg_type:0x1)
  [  180.207211] max77693-muic max77693-muic: CONTROL1 : 0x09, CONTROL2 : 0x04, state : attached
  [  180.309727] i2c i2c-15: sendbytes: NAK bailout.
  [  180.309996] sii9234 15-0039: writebm:  TPI[0x3d] <- 0x3e

Not sure if issue here is in muic driver or sii9234 driver.

OTG still does not seem to work, the muic driver detects (only) a
detach when OTG cable is attached:

  max77693-muic max77693-muic: external connector is detached(chg_type:0x0, prev_chg_type:0x0)

Same happened when otg cable was attached before these hsotg changes
as well. I suppose issue here is with max77693-muic driver.

Best regards,
Henrik Grimler

> ---
> 
> Changes in v2:
> 1. Put connector node in the muic node (Henrik)
> 
> Not tested on hardware. Please kindly check if peripheral mode is not
> broken. Or maybe OTG started to work?
> ---
>  .../boot/dts/samsung/exynos4412-midas.dtsi    | 50 ++++++++++++++++++-
>  1 file changed, 49 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm/boot/dts/samsung/exynos4412-midas.dtsi b/arch/arm/boot/dts/samsung/exynos4412-midas.dtsi
> index 57836d5554d0..7daf25865551 100644
> --- a/arch/arm/boot/dts/samsung/exynos4412-midas.dtsi
> +++ b/arch/arm/boot/dts/samsung/exynos4412-midas.dtsi
> @@ -182,6 +182,38 @@ pmic@66 {
>  			pinctrl-0 = <&max77693_irq>;
>  			reg = <0x66>;
>  
> +			muic {
> +				compatible = "maxim,max77693-muic";
> +
> +				connector {
> +					compatible = "samsung,usb-connector-11pin",
> +						     "usb-b-connector";
> +					label = "micro-USB";
> +					type = "micro";
> +
> +					ports {
> +						#address-cells = <1>;
> +						#size-cells = <0>;
> +
> +						port@0 {
> +							reg = <0>;
> +
> +							muic_to_usb: endpoint {
> +								remote-endpoint = <&usb_to_muic>;
> +							};
> +						};
> +
> +						port@3 {
> +							reg = <3>;
> +
> +							muic_to_mhl: endpoint {
> +								remote-endpoint = <&mhl_to_muic>;
> +							};
> +						};
> +					};
> +				};
> +			};
> +
>  			regulators {
>  				esafeout1_reg: ESAFEOUT1 {
>  					regulator-name = "ESAFEOUT1";
> @@ -287,6 +319,14 @@ mhl_to_hdmi: endpoint {
>  						remote-endpoint = <&hdmi_to_mhl>;
>  					};
>  				};
> +
> +				port@1 {
> +					reg = <1>;
> +
> +					mhl_to_muic: endpoint {
> +						remote-endpoint = <&muic_to_mhl>;
> +					};
> +				};
>  			};
>  		};
>  	};
> @@ -545,8 +585,16 @@ hdmi_to_mhl: endpoint {
>  &hsotg {
>  	vusb_d-supply = <&ldo15_reg>;
>  	vusb_a-supply = <&ldo12_reg>;
> -	dr_mode = "peripheral";
> +	dr_mode = "otg";
> +	role-switch-default-mode = "peripheral";
> +	usb-role-switch;
>  	status = "okay";
> +
> +	port {
> +		usb_to_muic: endpoint {
> +			remote-endpoint = <&muic_to_usb>;
> +		};
> +	};
>  };
>  
>  &i2c_0 {
> -- 
> 2.34.1
>