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SubjectRe: [PATCH v4 5/6] spi: at91-usart: add driver for at91-usart as spi
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On 29/05/2018 at 16:34, Nicolas Ferre wrote:
> On 29/05/2018 at 16:28, Radu Pirea wrote:
>>
>>
>> On 05/28/2018 11:21 AM, Andy Shevchenko wrote:
>>> On Fri, May 25, 2018 at 8:19 PM, Radu Pirea <radu.pirea@microchip.com> wrote:
>>>> This is the driver for at91-usart in spi mode. The USART IP can be configured
>>>> to work in many modes and one of them is SPI.
>
> [..]
>
>>>> +static int at91_usart_gpio_setup(struct platform_device *pdev)
>>>> +{
>>>
>>>> + struct device_node *np = pdev->dev.parent->of_node;
>>>
>>> Your driver is not OF specific as far as I can see. Drop all these
>>> device_node stuff and change API calls respectively.
>>
>> Ok. What do you suggest to use instead of OF API to get the count of
>> cs-gpios and to read their values one by one?
>
> As Alexandre said, we can make this driver OF specific.
>
> What could be interesting is to use the gpio descriptors API and not the
> older one. This would allow us to have far more control over the gpio
> that we use in our drivers (Ludovic is converting our drivers to only
> use gpiod structures).

Oh, but we already said that we cannot.
Disregard my comment then, sorry for the noise.

> Regards,
> Nicolas
>
>>
>>>
>>>> + int i;
>>>
>>>> + int ret = 0;
>>>> + int nb = 0;
>>>
>>> What happened to indentation?
>>>
>>> Redundnant assignment for both.
>>>
>>>> + if (!np)
>>>> + return -EINVAL;
>>>> +
>>>> + nb = of_gpio_named_count(np, "cs-gpios");
>>>> + for (i = 0; i < nb; i++) {
>>>> + int cs_gpio = of_get_named_gpio(np, "cs-gpios", i);
>>>> +
>>>> + if (cs_gpio < 0)
>>>> + return cs_gpio;
>>>> +
>>>> + if (gpio_is_valid(cs_gpio)) {
>>>> + ret = devm_gpio_request_one(&pdev->dev, cs_gpio,
>>>> + GPIOF_DIR_OUT,
>>>> + dev_name(&pdev->dev));
>>>> + if (ret)
>>>> + return ret;
>>>> + }
>>>> + }
>>>> +
>>>> + return 0;
>>>> +}
> [..]
>


--
Nicolas Ferre

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