linux-kernel - Re: [PATCH] arm64: dts: mediatek: mt8192-asurada-hayato: Enable Bluetooth

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Message-ID: <872e8b77-c1ea-410a-b978-dd8f49f9904b@notapiano>
Date:   Fri, 21 Apr 2023 10:01:22 -0400
From:   Nícolas F. R. A. Prado 
        <nfraprado@...labora.com>
To:     Chen-Yu Tsai <wenst@...omium.org>
Cc:     Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Subject: Re: [PATCH] arm64: dts: mediatek: mt8192-asurada-hayato: Enable
 Bluetooth

On Fri, Apr 21, 2023 at 07:03:27PM +0800, Chen-Yu Tsai wrote:
> Hayato's Realtek WiFi/BT module has it's Bluetooth function wired to
> UART1.
> 
> Add and enable the relevant device nodes for it.
> 
> Signed-off-by: Chen-Yu Tsai <wenst@...omium.org>
> ---
>  .../dts/mediatek/mt8192-asurada-hayato-r1.dts | 80 +++++++++++++++++++
>  1 file changed, 80 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/mediatek/mt8192-asurada-hayato-r1.dts b/arch/arm64/boot/dts/mediatek/mt8192-asurada-hayato-r1.dts
> index 43a823990a92..6a7d7870525b 100644
> --- a/arch/arm64/boot/dts/mediatek/mt8192-asurada-hayato-r1.dts
> +++ b/arch/arm64/boot/dts/mediatek/mt8192-asurada-hayato-r1.dts
> @@ -40,9 +40,89 @@ CROS_STD_MAIN_KEYMAP
>  	>;
>  };
>  
> +&pio {
> +	bt_pins: bt-pins {
> +		bt_kill: pins-bt-kill {

Drop this label and for the other pinconfigs below as they'll never be
referenced.

> +			pinmux = <PINMUX_GPIO144__FUNC_GPIO144>; /* BT_KILL_L */

I'd also drop this and the other comments, as they're already documented in the
gpio-line-names property.

> +			output-low;
> +		};
> +
> +		bt_wake: pins-bt-wake {
> +			pinmux = <PINMUX_GPIO22__FUNC_GPIO22>;  /* bt to wake ap */
> +			bias-pull-up;
> +		};
> +
> +		ap_wake_bt: pins-ap-wake-bt {
> +			pinmux = <PINMUX_GPIO168__FUNC_GPIO168>; /* AP_WAKE_BT_H */
> +			output-low;
> +		};
> +	};
> +
> +	uart1_pins: uart1-pins {
> +		pins-rx {
> +			pinmux = <PINMUX_GPIO94__FUNC_URXD1>;
> +			input-enable;
> +			bias-pull-up;
> +		};
> +
> +		pins-tx {
> +			pinmux = <PINMUX_GPIO95__FUNC_UTXD1>;
> +		};
> +
> +		pins-cts {
> +			pinmux = <PINMUX_GPIO166__FUNC_UCTS1>;
> +			input-enable;
> +		};
> +
> +		pins-rts {
> +			pinmux = <PINMUX_GPIO167__FUNC_URTS1>;
> +			output-enable;

Looks like the dt-binding doesn't currently support output-enable, but the
driver does, so please just add a patch with

          output-enable: true
	
on mediatek,mt8192-pinctrl.yaml

> +		};
> +	};
> +
> +	uart1_pins_sleep: uart1-pins-sleep {

"-pins" needs to come last in the name otherwise the dt-binding will complain.

> +		pins-rx {
> +			pinmux = <PINMUX_GPIO94__FUNC_GPIO94>;
> +			input-enable;
> +			bias-pull-up;
> +		};
> +		pins-tx {
> +			pinmux = <PINMUX_GPIO95__FUNC_UTXD1>;
> +		};
> +		pins-cts {
> +			pinmux = <PINMUX_GPIO166__FUNC_UCTS1>;
> +			input-enable;
> +		};
> +		pins-rts {
> +			pinmux = <PINMUX_GPIO167__FUNC_URTS1>;
> +			output-enable;
> +		};
> +	};
> +};
> +
>  &touchscreen {
>  	compatible = "hid-over-i2c";
>  	post-power-on-delay-ms = <10>;
>  	hid-descr-addr = <0x0001>;
>  	vdd-supply = <&pp3300_u>;
>  };
> +
> +&uart1 {
> +	status = "okay";
> +	pinctrl-names = "default", "sleep";
> +	pinctrl-0 = <&uart1_pins>;
> +	pinctrl-1 = <&uart1_pins_sleep>;
> +	/delete-property/ interrupts;
> +	interrupts-extended = <&gic GIC_SPI 110 IRQ_TYPE_LEVEL_HIGH 0>,
> +			      <&pio 94 IRQ_TYPE_EDGE_FALLING>;
> +
> +	bluetooth: bluetooth {

I'd also drop this label and only introduce it if/when needed.

Reviewed-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>

Thanks,
Nícolas

> +		compatible = "realtek,rtl8822cs-bt";
> +		pinctrl-names = "default";
> +		pinctrl-0 = <&bt_pins>;
> +
> +		enable-gpios = <&pio 144 GPIO_ACTIVE_HIGH>;
> +		device-wake-gpios = <&pio 168 GPIO_ACTIVE_HIGH>;
> +		host-wake-gpios = <&pio 22 GPIO_ACTIVE_LOW>;
> +	};
> +};
> -- 
> 2.40.0.634.g4ca3ef3211-goog
>