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Message-ID: <cafd8a40ad35dcf8a35350261af6031c@walle.cc>
Date: Mon, 27 Jun 2022 10:10:41 +0200
From: Michael Walle <michael@...le.cc>
To: Aidan MacDonald <aidanmacdonald.0x0@...il.com>
Cc: linus.walleij@...aro.org, brgl@...ev.pl, robh+dt@...nel.org,
krzysztof.kozlowski+dt@...aro.org, wens@...e.org, jic23@...nel.org,
lee.jones@...aro.org, sre@...nel.org, broonie@...nel.org,
gregkh@...uxfoundation.org, lgirdwood@...il.com, lars@...afoo.de,
rafael@...nel.org, quic_gurus@...cinc.com,
sebastian.reichel@...labora.com, andy.shevchenko@...il.com,
linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
linux-pm@...r.kernel.org
Subject: Re: [PATCH v3 13/16] pinctrl: Add AXP192 pin control driver
Hi,
As Linus suggested you could have a look at devm_gpio_regmap_register()
with a custom xlate() callback and some improvements. But I've never
worked with pinctrl so I might be wrong. See below.
> +static int axp192_gpio_get(struct gpio_chip *chip, unsigned int
> offset)
> +{
> + struct axp192_pctl *pctl = gpiochip_get_data(chip);
> + const struct axp192_pctl_reg_info *reginfo =
> &pctl->desc->in_regs[offset];
> + unsigned int val;
> + int ret;
> +
> + ret = regmap_read(pctl->regmap, reginfo->reg, &val);
> + if (ret)
> + return ret;
> +
> + return !!(val & reginfo->mask);
> +}
This should work.
> +
> +static int axp192_gpio_get_direction(struct gpio_chip *chip, unsigned
> int offset)
> +{
> + struct axp192_pctl *pctl = gpiochip_get_data(chip);
> + const struct axp192_pctl_reg_info *reginfo =
> &pctl->desc->ctrl_regs[offset];
> + const u8 *input_muxvals =
> pctl->desc->functions[AXP192_FUNC_INPUT].muxvals;
> + unsigned int val;
> + int ret;
> +
> + ret = regmap_read(pctl->regmap, reginfo->reg, &val);
> + if (ret)
> + return ret;
> +
> + if ((val & reginfo->mask) == (input_muxvals[offset] <<
> (ffs(reginfo->mask) - 1)))
> + return GPIO_LINE_DIRECTION_IN;
This isn't supported (yet) in gpio-regmap...
> +
> + return GPIO_LINE_DIRECTION_OUT;
> +}
> +
> +static void axp192_gpio_set(struct gpio_chip *chip, unsigned int
> offset, int value)
> +{
> + struct axp192_pctl *pctl = gpiochip_get_data(chip);
> + const struct axp192_pctl_reg_info *reginfo =
> &pctl->desc->out_regs[offset];
> +
> + regmap_update_bits(pctl->regmap, reginfo->reg, reginfo->mask, value
> ? reginfo->mask : 0);
> +}
> +
> +static int axp192_gpio_direction_input(struct gpio_chip *chip,
> unsigned int offset)
> +{
> + return pinctrl_gpio_direction_input(chip->base + offset);
> +}
..as well as this.
> +
> +static int axp192_gpio_direction_output(struct gpio_chip *chip,
> unsigned int offset, int value)
> +{
> + chip->set(chip, offset, value);
Why don't you call pinctrl_gpio_direction_output() here?
I *think* what is needed for gpio-regmap to support this is:
- support values and masks for the direction, for now, we
only support single bits.
- support the pinctrl_gpio_direction_{input,output} calls
-michael
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