linux-kernel - Re: [PATCH v2 1/1] tty: serial: qcom_geni_serial: Configure UART_IO_MACRO

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Message-ID: <20200123160839.GB3888@tuxbook-pro>
Date:   Thu, 23 Jan 2020 08:08:39 -0800
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Roja Rani Yarubandi <rojay@...eaurora.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        akashast@...eaurora.org, msavaliy@....qualcomm.com,
        mgautam@...eaurora.org, skakit@...eaurora.org,
        Andy Gross <agross@...nel.org>, Jiri Slaby <jslaby@...e.com>,
        linux-arm-msm@...r.kernel.org, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/1] tty: serial: qcom_geni_serial: Configure
 UART_IO_MACRO_CTRL register

On Thu 23 Jan 04:48 PST 2020, Roja Rani Yarubandi wrote:

> Configure UART_IO_MACRO_CTRL register if UART lines are swapped.
> 
> Signed-off-by: Roja Rani Yarubandi <rojay@...eaurora.org>
> ---
>  drivers/tty/serial/qcom_geni_serial.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c
> index ff63728a95f4..24b862937c1e 100644
> --- a/drivers/tty/serial/qcom_geni_serial.c
> +++ b/drivers/tty/serial/qcom_geni_serial.c
> @@ -24,6 +24,7 @@
>  
>  /* UART specific GENI registers */
>  #define SE_UART_LOOPBACK_CFG		0x22c
> +#define SE_UART_IO_MACRO_CTRL		0x240
>  #define SE_UART_TX_TRANS_CFG		0x25c
>  #define SE_UART_TX_WORD_LEN		0x268
>  #define SE_UART_TX_STOP_BIT_LEN		0x26c
> @@ -1260,6 +1261,7 @@ static int qcom_geni_serial_probe(struct platform_device *pdev)
>  	int irq;
>  	bool console = false;
>  	struct uart_driver *drv;
> +	u32 val;
>  
>  	if (of_device_is_compatible(pdev->dev.of_node, "qcom,geni-debug-uart"))
>  		console = true;
> @@ -1309,6 +1311,10 @@ static int qcom_geni_serial_probe(struct platform_device *pdev)
>  		return irq;
>  	uport->irq = irq;
>  
> +	ret = of_property_read_u32(pdev->dev.of_node, "qcom,pin_inverse", &val);

This needs to be documented in the DT binding document. And I assume
it's better suited as a bool property to be read using
of_property_read_bool().

Also avoid '_' in property names and make it a '-'.

Regards,
Bjorn

> +	if (!ret)
> +		writel(val, uport->membase + SE_UART_IO_MACRO_CTRL);
> +
>  	irq_set_status_flags(uport->irq, IRQ_NOAUTOEN);
>  	ret = devm_request_irq(uport->dev, uport->irq, qcom_geni_serial_isr,
>  			IRQF_TRIGGER_HIGH, port->name, uport);
> -- 
> QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
> of the Code Aurora Forum, hosted by The Linux Foundation
>