linux-kernel - Re: [PATCH v5 3/4] drivers/tty/serial/8250: add aspeed, lpc-io-reg and aspeed, lpc-interrupts DT properties

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Message-ID: <YG/1u/kxl12sIO0V@hatter.bewilderbeest.net>
Date:   Fri, 9 Apr 2021 01:35:39 -0500
From:   Zev Weiss <zev@...ilderbeest.net>
To:     Andrew Jeffery <andrew@...id.au>
Cc:     Joel Stanley <joel@....id.au>, linux-aspeed@...ts.ozlabs.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        openbmc@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        linux-serial@...r.kernel.org, Jiri Slaby <jirislaby@...nel.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v5 3/4] drivers/tty/serial/8250: add aspeed, lpc-io-reg
 and aspeed, lpc-interrupts DT properties

On Fri, Apr 09, 2021 at 12:14:54AM CDT, Andrew Jeffery wrote:
>Hi Zev,
>
>A couple of minor comments:
>
>On Thu, 8 Apr 2021, at 10:46, Zev Weiss wrote:
>> These allow describing all the Aspeed VUART attributes currently
>> available via sysfs.  aspeed,sirq
>
>aspeed,lpc-interrupts now

Ah right, thanks.

>
>> provides a replacement for the
>> deprecated aspeed,sirq-polarity-sense property.
>>
>> Signed-off-by: Zev Weiss <zev@...ilderbeest.net>
>> ---
>>  drivers/tty/serial/8250/8250_aspeed_vuart.c | 44 ++++++++++++++++++++-
>>  1 file changed, 43 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/tty/serial/8250/8250_aspeed_vuart.c
>> b/drivers/tty/serial/8250/8250_aspeed_vuart.c
>> index 8433f8dbb186..75ef006fa24b 100644
>> --- a/drivers/tty/serial/8250/8250_aspeed_vuart.c
>> +++ b/drivers/tty/serial/8250/8250_aspeed_vuart.c
>> @@ -28,6 +28,10 @@
>>  #define ASPEED_VUART_ADDRL		0x28
>>  #define ASPEED_VUART_ADDRH		0x2c
>>
>> +#define ASPEED_VUART_DEFAULT_LPC_ADDR	0x3f8
>> +#define ASPEED_VUART_DEFAULT_SIRQ	4
>> +#define ASPEED_VUART_DEFAULT_SIRQ_POLARITY	IRQ_TYPE_LEVEL_LOW
>> +
>>  struct aspeed_vuart {
>>  	struct device		*dev;
>>  	void __iomem		*regs;
>> @@ -393,7 +397,8 @@ static int aspeed_vuart_probe(struct platform_device *pdev)
>>  	struct aspeed_vuart *vuart;
>>  	struct device_node *np;
>>  	struct resource *res;
>> -	u32 clk, prop;
>> +	u32 clk, prop, sirq[2];
>> +	bool sirq_polarity;
>>  	int rc;
>>
>>  	np = pdev->dev.of_node;
>> @@ -501,6 +506,43 @@ static int aspeed_vuart_probe(struct platform_device *pdev)
>>  		of_node_put(sirq_polarity_sense_args.np);
>>  	}
>>
>> +	rc = of_property_read_u32(np, "aspeed,lpc-io-reg", &prop);
>> +	if (rc < 0)
>> +		prop = ASPEED_VUART_DEFAULT_LPC_ADDR;
>> +
>> +	rc = aspeed_vuart_set_lpc_address(vuart, prop);
>> +	if (rc < 0) {
>> +		dev_err(&pdev->dev, "invalid value in aspeed,lpc-io-reg property\n");
>> +		goto err_clk_disable;
>> +	}
>> +
>> +	rc = of_property_read_u32_array(np, "aspeed,lpc-interrupts", sirq, 2);
>> +	if (rc < 0) {
>> +		sirq[0] = ASPEED_VUART_DEFAULT_SIRQ;
>> +		sirq[1] = ASPEED_VUART_DEFAULT_SIRQ_POLARITY;
>> +	}
>> +
>> +	rc = aspeed_vuart_set_sirq(vuart, sirq[0]);
>> +	if (rc < 0) {
>> +		dev_err(&pdev->dev, "invalid sirq number in aspeed,lpc-interrupts > property\n");
>> +		goto err_clk_disable;
>> +	}
>> +
>> +	switch (sirq[1]) {
>> +	case IRQ_TYPE_LEVEL_LOW:
>> +		sirq_polarity = false;
>> +		break;
>> +	case IRQ_TYPE_LEVEL_HIGH:
>> +		sirq_polarity = true;
>> +		break;
>> +	default:
>> +		dev_err(&pdev->dev, "invalid sirq polarity in aspeed,lpc-interrupts
>> property\n");
>> +		rc = -EINVAL;
>> +		goto err_clk_disable;
>> +	}
>
>A bit ugly open-coding the mapping and error handling, maybe worth a helper?
>

Yeah, that sounds reasonable -- will do.

Thanks!


Zev