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SubjectRe: [RFC] serial: sc16is7xx: Use DT sub-nodes for UART ports
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Am 10.08.2018 um 19:34 schrieb Rob Herring:
> On Sun, Aug 5, 2018 at 5:27 PM Andreas Färber <afaerber@suse.de> wrote:
>>
>> This is to allow using serdev.
>>
>> Signed-off-by: Andreas Färber <afaerber@suse.de>
>> ---
>> drivers/tty/serial/sc16is7xx.c | 25 +++++++++++++++++++++++++
>> 1 file changed, 25 insertions(+)
>>
>> diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c
>> index 243c96025053..ad7267274f65 100644
>> --- a/drivers/tty/serial/sc16is7xx.c
>> +++ b/drivers/tty/serial/sc16is7xx.c
>> @@ -1213,9 +1213,31 @@ static int sc16is7xx_probe(struct device *dev,
>> SC16IS7XX_IOCONTROL_SRESET_BIT);
>>
>> for (i = 0; i < devtype->nr_uart; ++i) {
>> +#ifdef CONFIG_OF
>> + struct device_node *np;
>> + struct platform_device *pdev;
>> + char name[6] = "uartx";
>> +#endif
>> +
>> s->p[i].line = i;
>> /* Initialize port data */
>> +#ifdef CONFIG_OF
>> + name[4] = '0' + i;
>> + np = of_get_child_by_name(dev->of_node, name);
>> + if (IS_ERR(np)) {
>> + ret = PTR_ERR(np);
>> + goto out_ports;
>> + }
>> + pdev = of_platform_device_create(np, NULL, dev);
>
> Ideally, you would use of_platform_default_populate here. I think
> you'd have to add a compatible to the child nodes, but that wouldn't
> be a bad thing. I could envision that the child nodes ultimately
> become their own driver utilizing the standard 8250 driver and a
> compatible string would be needed in that case.

Separate compatibles would mean separate drivers.

Unlike your DUART example this is not an MMIO device that we can easily
split but a SPI slave (well, regmap due to some I2C models).

I don't see how separate drivers could work, given that the whole
spi_device has a single interrupt for all functions of this device.

That left me with this ugly but working construct.

Is the uartX naming correct, or should it be serialX?

Regards,
Andreas

>
> You'd then have to loop over each child of 'dev' instead of the DT nodes.
>
>> + if (IS_ERR(pdev)) {
>> + ret = PTR_ERR(pdev);
>> + goto out_ports;
>> + }
>> + platform_set_drvdata(pdev, dev_get_drvdata(dev));
>> + s->p[i].port.dev = &pdev->dev;
>> +#else
>> s->p[i].port.dev = dev;
>> +#endif
>> s->p[i].port.irq = irq;
>> s->p[i].port.type = PORT_SC16IS7XX;
>> s->p[i].port.fifosize = SC16IS7XX_FIFO_SIZE;


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