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Date: Fri, 12 May 2023 22:19:14 +0300
From: andy.shevchenko@...il.com
To: Charles Keepax <ckeepax@...nsource.cirrus.com>
Cc: broonie@...nel.org, lee@...nel.org, robh+dt@...nel.org,
krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
tglx@...utronix.de, maz@...nel.org, linus.walleij@...aro.org,
vkoul@...nel.org, lgirdwood@...il.com,
yung-chuan.liao@...ux.intel.com, sanyog.r.kale@...el.com,
pierre-louis.bossart@...ux.intel.com, alsa-devel@...a-project.org,
patches@...nsource.cirrus.com, devicetree@...r.kernel.org,
linux-gpio@...r.kernel.org, linux-spi@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 08/10] pinctrl: cs42l43: Add support for the cs42l43
Fri, May 12, 2023 at 01:28:36PM +0100, Charles Keepax kirjoitti:
> The CS42L43 is an audio CODEC with integrated MIPI SoundWire interface
> (Version 1.2.1 compliant), I2C, SPI, and I2S/TDM interfaces designed
> for portable applications. It provides a high dynamic range, stereo
> DAC for headphone output, two integrated Class D amplifiers for
> loudspeakers, and two ADCs for wired headset microphone input or
> stereo line input. PDM inputs are provided for digital microphones.
>
> Add a basic pinctrl driver which supports driver strength for the
> various pins, gpios, and pinmux for the 2 multi-function pins.
...
> +#include <linux/pinctrl/consumer.h>
> +#include <linux/pinctrl/pinctrl.h>
> +#include <linux/pinctrl/pinmux.h>
> +#include <linux/pinctrl/pinconf.h>
> +#include <linux/pinctrl/pinconf-generic.h>
Can you order them and split into a separate group that goes...
> +#include <linux/platform_device.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/regmap.h>
> +
...here?
> +#include "../pinctrl-utils.h"
...
> +struct cs42l43_pin {
> + struct device *dev;
> + struct regmap *regmap;
> + bool shutters_locked;
> + struct gpio_chip gpio_chip;
If you move this to be the first member you might save a few bytes of code.
> + struct pinctrl_gpio_range range;
Is it really needed here?
> +};
...
> +#define CS42L43_PIN(_number, _name, _reg, _field) { \
> + .number = _number, .name = _name, \
> + .drv_data = &((struct cs42l43_pin_data){ \
> + .reg = CS42L43_##_reg, \
> + .shift = CS42L43_##_field##_DRV_SHIFT, \
> + .mask = CS42L43_##_field##_DRV_MASK, \
> + }), \
Do you need this to be GCC extention for the value evaluation?
I mean the compound literal, IIRC, can be used directly as
.foo = &(struct foo){ ... },
Am I mistaken?
> +}
...
> +#define CS42L43_PINGROUP(_name) \
Use PINCTRL_PINGROUP() instead of open coded.
> +(struct pingroup){ \
> + .name = #_name, \
> + .pins = cs42l43_pin_##_name##_pins, \
> + .npins = ARRAY_SIZE(cs42l43_pin_##_name##_pins) \
> +}
...
> +enum cs42l43_pin_funcs {
> + CS42L43_FUNC_GPIO,
> + CS42L43_FUNC_SPDIF,
> + CS42L43_FUNC_IRQ,
> + CS42L43_FUNC_MIC_SHT,
> + CS42L43_FUNC_SPK_SHT,
> + CS42L43_FUNC_MAX,
No comma for the terminator entry
> +};
...
> +static const char * const cs42l43_pin_funcs[] = {
> + "gpio", "spdif", "irq", "mic-shutter", "spk-shutter"
I would keep trailing comma.
> +};
...
> +struct cs42l43_pin_func_group {
> + const char * const *groups;
> + unsigned int ngroups;
> +};
We have struct pinfunction.
> +static const struct cs42l43_pin_func_group cs42l43_pin_func_groups[] = {
> + { cs42l43_pin_gpio_groups, ARRAY_SIZE(cs42l43_pin_gpio_groups) },
> + { cs42l43_pin_spdif_groups, ARRAY_SIZE(cs42l43_pin_spdif_groups) },
> + { cs42l43_pin_irq_groups, ARRAY_SIZE(cs42l43_pin_irq_groups) },
> + { cs42l43_pin_shutter_groups, ARRAY_SIZE(cs42l43_pin_shutter_groups) },
> + { cs42l43_pin_shutter_groups, ARRAY_SIZE(cs42l43_pin_shutter_groups) },
We have PINCTRL_PINFUNCTION().
> +};
...
> +static int cs42l43_pin_get_func_count(struct pinctrl_dev *pctldev)
> +{
> + BUILD_BUG_ON(ARRAY_SIZE(cs42l43_pin_funcs) != CS42L43_FUNC_MAX);
> + BUILD_BUG_ON(ARRAY_SIZE(cs42l43_pin_func_groups) != CS42L43_FUNC_MAX);
Use static_assert() in the global scope instead.
> +
> + return ARRAY_SIZE(cs42l43_pin_funcs);
> +}
...
> + default:
> + reg = CS42L43_GPIO_FN_SEL;
> + mask = BIT(group_idx + CS42L43_GPIO1_FN_SEL_SHIFT);
> + val = (func_idx == CS42L43_FUNC_GPIO) <<
> + (group_idx + CS42L43_GPIO1_FN_SEL_SHIFT);
This would be better as ternary.
> + break;
> + }
...
> + dev_dbg(priv->dev, "Setting gpio%d to %s\n",
> + offset + 1, input ? "input" : "output");
How ' + 1' part won't be confusing?
...
> +static inline int cs42l43_pin_get_db(struct cs42l43_pin *priv, unsigned int pin)
> +{
> + unsigned int val;
> + int ret;
> +
> + if (pin >= CS42L43_NUM_GPIOS)
> + return -ENOTSUPP;
> +
> + ret = regmap_read(priv->regmap, CS42L43_GPIO_CTRL2, &val);
> + if (ret)
> + return ret;
> +
> + if (val & (CS42L43_GPIO1_DEGLITCH_BYP_MASK << pin))
> + return 0;
> + else
Redundant.
> + return 85; // Debounce is roughly 85uS
// Debounce is roughly 85uS
return 85;
> +}
...
> + dev_dbg(priv->dev, "Set debounce %s for %s\n",
> + us ? "on" : "off", cs42l43_pin_pins[pin].name);
str_on_off()
...
> + ++configs;
> + --num_configs;
Why preincrements?
...
> + if (is_of_node(dev_fwnode(cs42l43->dev))) {
> + device_set_node(priv->dev,
> + fwnode_get_named_child_node(dev_fwnode(cs42l43->dev),
> + "pinctrl"));
> + } else {
> + device_set_node(priv->dev, dev_fwnode(cs42l43->dev));
> + }
This can be called once after if.
...
> + pctldev = devm_pinctrl_register(priv->dev, &cs42l43_pin_desc, priv);
> + if (IS_ERR(pctldev)) {
> + ret = PTR_ERR(pctldev);
> + dev_err(priv->dev, "Failed to register pinctrl: %d\n", ret);
ret = dev_err_probe();
Same for other similar cases.
> + goto err_pm;
> + }
> + if (!of_property_read_bool(dev_of_node(cs42l43->dev), "gpio-ranges")) {
> + ret = gpiochip_add_pin_range(&priv->gpio_chip, priv->gpio_chip.label,
> + 0, 0, CS42L43_NUM_GPIOS);
> + if (ret) {
> + dev_err(priv->dev, "Failed to add GPIO pin range: %d\n", ret);
> + goto err_pm;
> + }
> + }
Besides the fact that we have a callback for this, why GPIO library can't
handle this for you already?
...
> +static int cs42l43_pin_remove(struct platform_device *pdev)
> +{
> + pm_runtime_disable(&pdev->dev);
This is simply wrong order because it's a mix of non-devm_*() followed by
devm_*() calls in the probe.
> + return 0;
> +}
...
> +static struct platform_driver cs42l43_pin_driver = {
> + .driver = {
> + .name = "cs42l43-pinctrl",
> + },
> +
Redundant blank line.
> + .probe = cs42l43_pin_probe,
> + .remove = cs42l43_pin_remove,
> +};
--
With Best Regards,
Andy Shevchenko
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