On Tue, Jun 6, 2017 at 1:55 PM, Rajmohan Mani <rajmohan.mani@xxxxxxxxx> wrote:
> This patch adds support for TPS68470 GPIOs.
> There are 7 GPIOs and a few sensor related GPIOs.
> These GPIOs can be requested and configured as
> appropriate.
>
> Signed-off-by: Rajmohan Mani <rajmohan.mani@xxxxxxxxx>
Same comments as Andy already sent, plus:
> +static inline struct tps68470_gpio_data *to_gpio_data(struct gpio_chip *gpiochp)
> +{
> + return container_of(gpiochp, struct tps68470_gpio_data, gc);
> +}
Please use the data pointe inside gpio_chip.
struct tps68470_gpio_data *foo = gpiochip_get_data(gc);
> + ret = tps68470_reg_read(tps, reg, &val);
(...)
> + tps68470_update_bits(tps, reg, BIT(offset), value ? BIT(offset) : 0);
(...)
> + return tps68470_update_bits(tps, TPS68470_GPIO_CTL_REG_A(offset),
> + TPS68470_GPIO_MODE_MASK,
> + TPS68470_GPIO_MODE_OUT_CMOS);
(...)
> + return tps68470_update_bits(tps, TPS68470_GPIO_CTL_REG_A(offset),
> + TPS68470_GPIO_MODE_MASK, 0x00);
This looks like a reimplementation of regmap. Is it not possible
to create a regmap in the MFD driver and pass that around instead?
> +struct gpiod_lookup_table gpios_table = {
> + .dev_id = NULL,
> + .table = {
> + GPIO_LOOKUP("tps68470-gpio", 0, "gpio.0", GPIO_ACTIVE_HIGH),
> + GPIO_LOOKUP("tps68470-gpio", 1, "gpio.1", GPIO_ACTIVE_HIGH),
> + GPIO_LOOKUP("tps68470-gpio", 2, "gpio.2", GPIO_ACTIVE_HIGH),
> + GPIO_LOOKUP("tps68470-gpio", 3, "gpio.3", GPIO_ACTIVE_HIGH),
> + GPIO_LOOKUP("tps68470-gpio", 4, "gpio.4", GPIO_ACTIVE_HIGH),
> + GPIO_LOOKUP("tps68470-gpio", 5, "gpio.5", GPIO_ACTIVE_HIGH),
> + GPIO_LOOKUP("tps68470-gpio", 6, "gpio.6", GPIO_ACTIVE_HIGH),
> + GPIO_LOOKUP("tps68470-gpio", 7, "s_enable", GPIO_ACTIVE_HIGH),
> + GPIO_LOOKUP("tps68470-gpio", 8, "s_idle", GPIO_ACTIVE_HIGH),
> + GPIO_LOOKUP("tps68470-gpio", 9, "s_resetn", GPIO_ACTIVE_HIGH),
> + {},
> + },
> +};
Hm that's why you include <linux/gpio/machine.h> I guess.
This warrants a big comment above it explaining why this is done like
that and what the use is inside any system with this chip mounted.
> + tps68470_gpio->gc.label = "tps68470-gpio";
> + tps68470_gpio->gc.owner = THIS_MODULE;
> + tps68470_gpio->gc.direction_input = tps68470_gpio_input;
> + tps68470_gpio->gc.direction_output = tps68470_gpio_output;
Please implement .get_direction()
> + tps68470_gpio->gc.get = tps68470_gpio_get;
> + tps68470_gpio->gc.set = tps68470_gpio_set;
> + tps68470_gpio->gc.can_sleep = true;
> + tps68470_gpio->gc.ngpio = TPS68470_N_GPIO;
> + tps68470_gpio->gc.base = -1;
> + tps68470_gpio->gc.parent = &pdev->dev;
Consider assigning the .names() array some sensible line names.
> +static int tps68470_gpio_remove(struct platform_device *pdev)
> +{
> + struct tps68470_gpio_data *tps68470_gpio = platform_get_drvdata(pdev);
> +
> + gpiod_remove_lookup_table(&gpios_table);
> + gpiochip_remove(&tps68470_gpio->gc);
You can't use devm_gpiochip_add()?
Yours,
Linus Walleij
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