lkml.org 
[lkml]   [2016]   [Nov]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] gpio: Add Tegra186 support

On Tuesday 22 November 2016 11:25 PM, Thierry Reding wrote:
> +static inline struct tegra_gpio *to_tegra_gpio(struct gpio_chip *chip)
> +{
> + return container_of(chip, struct tegra_gpio, gpio);
> +}

You dont need this as gpiochip_get_data(chip); can provide the required
driver specific data.

> +
> +static const struct tegra_gpio_port *
> +tegra186_gpio_get_port(struct tegra_gpio *gpio, unsigned int *pin)
> +{
> + unsigned int start = 0, i;
> +
> + for (i = 0; i < gpio->soc->num_ports; i++) {
> + const struct tegra_gpio_port *port = &gpio->soc->ports[i];
> +
> + if (*pin >= start && *pin < start + port->pins) {
> + *pin -= start;
> + return port;
> + }
> +
> + start += port->pins;
> + }
> +
Why not get the port from pins and then calculate with fixed offset.
We will not need the loop if we know the port number.

>
> +
> +static int tegra186_gpio_direction_output(struct gpio_chip *chip,
> + unsigned int offset, int level)
> +{
> + struct tegra_gpio *gpio = to_tegra_gpio(chip);
> + void __iomem *base;
> + u32 value;
> +
> + /* configure output level first */
> + chip->set(chip, offset, level);
We can directly call the apis instead of function pointer at this point.
>
> +
> +static struct lock_class_key tegra186_gpio_lock_class;
We will have two instance of the driver (normal and AON) and so this
will be shared between them.
Do we really support multiple instance with same variable?


> +
> + gpio->gpio.label = "tegra186-gpio";
Two instance will have same name. Better to say tegra186-gpio and
tegra186-gpio-aon.


> + gpio->gpio.parent = &pdev->dev;
> +
> + gpio->gpio.get_direction = tegra186_gpio_get_direction;
> + gpio->gpio.direction_input = tegra186_gpio_direction_input;
> + gpio->gpio.direction_output = tegra186_gpio_direction_output;
> + gpio->gpio.get = tegra186_gpio_get,
> + gpio->gpio.set = tegra186_gpio_set;
> + gpio->gpio.to_irq = tegra186_gpio_to_irq;
> +
> + gpio->gpio.base = -1;
> +
> + for (i = 0; i < gpio->soc->num_ports; i++)
> + gpio->gpio.ngpio += gpio->soc->ports[i].pins;
> +

Our DT binding does not say this. We assume that we have 8 gpios per
port. so this will not work at all.



>
> +
> +static const struct tegra_gpio_port tegra186_main_ports[] = {
> + [TEGRA_MAIN_GPIO_PORT_A] = { 0x2000, 7 },
Use C99 style initialization which is like
.offset =
.pins =
>

\
 
 \ /
  Last update: 2016-11-24 08:13    [W:0.104 / U:4.020 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site