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Date: Wed, 13 Jul 2022 21:54:19 +0200
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Horatiu Vultur <horatiu.vultur@...rochip.com>
Cc: "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Linus Walleij <linus.walleij@...aro.org>,
Alexandre Belloni <alexandre.belloni@...tlin.com>,
kavyasree.kotagiri@...rochip.com,
Colin Foster <colin.foster@...advantage.com>,
Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>,
Maxime Chevallier <maxime.chevallier@...tlin.com>,
Michael Walle <michael@...le.cc>
Subject: Re: [PATCH v5 1/2] pinctrl: ocelot: Fix pincfg for lan966x
On Wed, Jul 13, 2022 at 9:34 PM Horatiu Vultur
<horatiu.vultur@...rochip.com> wrote:
>
> The blamed commit introduce support for lan966x which use the same
> pinconf_ops as sparx5. The problem is that pinconf_ops is specific to
> sparx5. More precisely the offset of the bits in the pincfg register are
> different and also lan966x doesn't have support for
> PIN_CONFIG_INPUT_SCHMITT_ENABLE.
>
> Fix this by making pinconf_ops more generic such that it can be also
> used by lan966x. This is done by introducing 'ocelot_pincfg_data' which
> contains the offset and what is supported for each SOC.
I think there is still room for improvement (like refactoring all this
->get() and ->set() to avoid multiple parameter check, etc), but it is
out of scope and can be done later on. That said,
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
> Fixes: 531d6ab36571 ("pinctrl: ocelot: Extend support for lan966x")
> Signed-off-by: Horatiu Vultur <horatiu.vultur@...rochip.com>
> ---
> drivers/pinctrl/pinctrl-ocelot.c | 195 ++++++++++++++++++++-----------
> 1 file changed, 124 insertions(+), 71 deletions(-)
>
> diff --git a/drivers/pinctrl/pinctrl-ocelot.c b/drivers/pinctrl/pinctrl-ocelot.c
> index 5f4a8c5c6650..c6e0232770b7 100644
> --- a/drivers/pinctrl/pinctrl-ocelot.c
> +++ b/drivers/pinctrl/pinctrl-ocelot.c
> @@ -29,19 +29,12 @@
> #define ocelot_clrsetbits(addr, clear, set) \
> writel((readl(addr) & ~(clear)) | (set), (addr))
>
> -/* PINCONFIG bits (sparx5 only) */
> enum {
> PINCONF_BIAS,
> PINCONF_SCHMITT,
> PINCONF_DRIVE_STRENGTH,
> };
>
> -#define BIAS_PD_BIT BIT(4)
> -#define BIAS_PU_BIT BIT(3)
> -#define BIAS_BITS (BIAS_PD_BIT|BIAS_PU_BIT)
> -#define SCHMITT_BIT BIT(2)
> -#define DRIVE_BITS GENMASK(1, 0)
> -
> /* GPIO standard registers */
> #define OCELOT_GPIO_OUT_SET 0x0
> #define OCELOT_GPIO_OUT_CLR 0x4
> @@ -321,6 +314,13 @@ struct ocelot_pin_caps {
> unsigned char a_functions[OCELOT_FUNC_PER_PIN]; /* Additional functions */
> };
>
> +struct ocelot_pincfg_data {
> + u8 pd_bit;
> + u8 pu_bit;
> + u8 drive_bits;
> + u8 schmitt_bit;
> +};
> +
> struct ocelot_pinctrl {
> struct device *dev;
> struct pinctrl_dev *pctl;
> @@ -328,10 +328,16 @@ struct ocelot_pinctrl {
> struct regmap *map;
> struct regmap *pincfg;
> struct pinctrl_desc *desc;
> + const struct ocelot_pincfg_data *pincfg_data;
> struct ocelot_pmx_func func[FUNC_MAX];
> u8 stride;
> };
>
> +struct ocelot_match_data {
> + struct pinctrl_desc desc;
> + struct ocelot_pincfg_data pincfg_data;
> +};
> +
> #define LUTON_P(p, f0, f1) \
> static struct ocelot_pin_caps luton_pin_##p = { \
> .pin = p, \
> @@ -1325,6 +1331,7 @@ static int ocelot_hw_get_value(struct ocelot_pinctrl *info,
> int ret = -EOPNOTSUPP;
>
> if (info->pincfg) {
> + const struct ocelot_pincfg_data *opd = info->pincfg_data;
> u32 regcfg;
>
> ret = regmap_read(info->pincfg, pin, ®cfg);
> @@ -1334,15 +1341,15 @@ static int ocelot_hw_get_value(struct ocelot_pinctrl *info,
> ret = 0;
> switch (reg) {
> case PINCONF_BIAS:
> - *val = regcfg & BIAS_BITS;
> + *val = regcfg & (opd->pd_bit | opd->pu_bit);
> break;
>
> case PINCONF_SCHMITT:
> - *val = regcfg & SCHMITT_BIT;
> + *val = regcfg & opd->schmitt_bit;
> break;
>
> case PINCONF_DRIVE_STRENGTH:
> - *val = regcfg & DRIVE_BITS;
> + *val = regcfg & opd->drive_bits;
> break;
>
> default:
> @@ -1379,23 +1386,27 @@ static int ocelot_hw_set_value(struct ocelot_pinctrl *info,
> int ret = -EOPNOTSUPP;
>
> if (info->pincfg) {
> + const struct ocelot_pincfg_data *opd = info->pincfg_data;
>
> ret = 0;
> switch (reg) {
> case PINCONF_BIAS:
> - ret = ocelot_pincfg_clrsetbits(info, pin, BIAS_BITS,
> + ret = ocelot_pincfg_clrsetbits(info, pin,
> + opd->pd_bit | opd->pu_bit,
> val);
> break;
>
> case PINCONF_SCHMITT:
> - ret = ocelot_pincfg_clrsetbits(info, pin, SCHMITT_BIT,
> + ret = ocelot_pincfg_clrsetbits(info, pin,
> + opd->schmitt_bit,
> val);
> break;
>
> case PINCONF_DRIVE_STRENGTH:
> if (val <= 3)
> ret = ocelot_pincfg_clrsetbits(info, pin,
> - DRIVE_BITS, val);
> + opd->drive_bits,
> + val);
> else
> ret = -EINVAL;
> break;
> @@ -1425,17 +1436,20 @@ static int ocelot_pinconf_get(struct pinctrl_dev *pctldev,
> if (param == PIN_CONFIG_BIAS_DISABLE)
> val = (val == 0);
> else if (param == PIN_CONFIG_BIAS_PULL_DOWN)
> - val = (val & BIAS_PD_BIT ? true : false);
> + val = !!(val & info->pincfg_data->pd_bit);
> else /* PIN_CONFIG_BIAS_PULL_UP */
> - val = (val & BIAS_PU_BIT ? true : false);
> + val = !!(val & info->pincfg_data->pu_bit);
> break;
>
> case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
> + if (!info->pincfg_data->schmitt_bit)
> + return -EOPNOTSUPP;
> +
> err = ocelot_hw_get_value(info, pin, PINCONF_SCHMITT, &val);
> if (err)
> return err;
>
> - val = (val & SCHMITT_BIT ? true : false);
> + val = !!(val & info->pincfg_data->schmitt_bit);
> break;
>
> case PIN_CONFIG_DRIVE_STRENGTH:
> @@ -1479,6 +1493,7 @@ static int ocelot_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
> unsigned long *configs, unsigned int num_configs)
> {
> struct ocelot_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
> + const struct ocelot_pincfg_data *opd = info->pincfg_data;
> u32 param, arg, p;
> int cfg, err = 0;
>
> @@ -1491,8 +1506,8 @@ static int ocelot_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
> case PIN_CONFIG_BIAS_PULL_UP:
> case PIN_CONFIG_BIAS_PULL_DOWN:
> arg = (param == PIN_CONFIG_BIAS_DISABLE) ? 0 :
> - (param == PIN_CONFIG_BIAS_PULL_UP) ? BIAS_PU_BIT :
> - BIAS_PD_BIT;
> + (param == PIN_CONFIG_BIAS_PULL_UP) ?
> + opd->pu_bit : opd->pd_bit;
>
> err = ocelot_hw_set_value(info, pin, PINCONF_BIAS, arg);
> if (err)
> @@ -1501,7 +1516,10 @@ static int ocelot_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
> break;
>
> case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
> - arg = arg ? SCHMITT_BIT : 0;
> + if (!opd->schmitt_bit)
> + return -EOPNOTSUPP;
> +
> + arg = arg ? opd->schmitt_bit : 0;
> err = ocelot_hw_set_value(info, pin, PINCONF_SCHMITT,
> arg);
> if (err)
> @@ -1562,69 +1580,94 @@ static const struct pinctrl_ops ocelot_pctl_ops = {
> .dt_free_map = pinconf_generic_dt_free_map,
> };
>
> -static struct pinctrl_desc luton_desc = {
> - .name = "luton-pinctrl",
> - .pins = luton_pins,
> - .npins = ARRAY_SIZE(luton_pins),
> - .pctlops = &ocelot_pctl_ops,
> - .pmxops = &ocelot_pmx_ops,
> - .owner = THIS_MODULE,
> +static struct ocelot_match_data luton_desc = {
> + .desc = {
> + .name = "luton-pinctrl",
> + .pins = luton_pins,
> + .npins = ARRAY_SIZE(luton_pins),
> + .pctlops = &ocelot_pctl_ops,
> + .pmxops = &ocelot_pmx_ops,
> + .owner = THIS_MODULE,
> + },
> };
>
> -static struct pinctrl_desc serval_desc = {
> - .name = "serval-pinctrl",
> - .pins = serval_pins,
> - .npins = ARRAY_SIZE(serval_pins),
> - .pctlops = &ocelot_pctl_ops,
> - .pmxops = &ocelot_pmx_ops,
> - .owner = THIS_MODULE,
> +static struct ocelot_match_data serval_desc = {
> + .desc = {
> + .name = "serval-pinctrl",
> + .pins = serval_pins,
> + .npins = ARRAY_SIZE(serval_pins),
> + .pctlops = &ocelot_pctl_ops,
> + .pmxops = &ocelot_pmx_ops,
> + .owner = THIS_MODULE,
> + },
> };
>
> -static struct pinctrl_desc ocelot_desc = {
> - .name = "ocelot-pinctrl",
> - .pins = ocelot_pins,
> - .npins = ARRAY_SIZE(ocelot_pins),
> - .pctlops = &ocelot_pctl_ops,
> - .pmxops = &ocelot_pmx_ops,
> - .owner = THIS_MODULE,
> +static struct ocelot_match_data ocelot_desc = {
> + .desc = {
> + .name = "ocelot-pinctrl",
> + .pins = ocelot_pins,
> + .npins = ARRAY_SIZE(ocelot_pins),
> + .pctlops = &ocelot_pctl_ops,
> + .pmxops = &ocelot_pmx_ops,
> + .owner = THIS_MODULE,
> + },
> };
>
> -static struct pinctrl_desc jaguar2_desc = {
> - .name = "jaguar2-pinctrl",
> - .pins = jaguar2_pins,
> - .npins = ARRAY_SIZE(jaguar2_pins),
> - .pctlops = &ocelot_pctl_ops,
> - .pmxops = &ocelot_pmx_ops,
> - .owner = THIS_MODULE,
> +static struct ocelot_match_data jaguar2_desc = {
> + .desc = {
> + .name = "jaguar2-pinctrl",
> + .pins = jaguar2_pins,
> + .npins = ARRAY_SIZE(jaguar2_pins),
> + .pctlops = &ocelot_pctl_ops,
> + .pmxops = &ocelot_pmx_ops,
> + .owner = THIS_MODULE,
> + },
> };
>
> -static struct pinctrl_desc servalt_desc = {
> - .name = "servalt-pinctrl",
> - .pins = servalt_pins,
> - .npins = ARRAY_SIZE(servalt_pins),
> - .pctlops = &ocelot_pctl_ops,
> - .pmxops = &ocelot_pmx_ops,
> - .owner = THIS_MODULE,
> +static struct ocelot_match_data servalt_desc = {
> + .desc = {
> + .name = "servalt-pinctrl",
> + .pins = servalt_pins,
> + .npins = ARRAY_SIZE(servalt_pins),
> + .pctlops = &ocelot_pctl_ops,
> + .pmxops = &ocelot_pmx_ops,
> + .owner = THIS_MODULE,
> + },
> };
>
> -static struct pinctrl_desc sparx5_desc = {
> - .name = "sparx5-pinctrl",
> - .pins = sparx5_pins,
> - .npins = ARRAY_SIZE(sparx5_pins),
> - .pctlops = &ocelot_pctl_ops,
> - .pmxops = &ocelot_pmx_ops,
> - .confops = &ocelot_confops,
> - .owner = THIS_MODULE,
> +static struct ocelot_match_data sparx5_desc = {
> + .desc = {
> + .name = "sparx5-pinctrl",
> + .pins = sparx5_pins,
> + .npins = ARRAY_SIZE(sparx5_pins),
> + .pctlops = &ocelot_pctl_ops,
> + .pmxops = &ocelot_pmx_ops,
> + .confops = &ocelot_confops,
> + .owner = THIS_MODULE,
> + },
> + .pincfg_data = {
> + .pd_bit = BIT(4),
> + .pu_bit = BIT(3),
> + .drive_bits = GENMASK(1, 0),
> + .schmitt_bit = BIT(2),
> + },
> };
>
> -static struct pinctrl_desc lan966x_desc = {
> - .name = "lan966x-pinctrl",
> - .pins = lan966x_pins,
> - .npins = ARRAY_SIZE(lan966x_pins),
> - .pctlops = &ocelot_pctl_ops,
> - .pmxops = &lan966x_pmx_ops,
> - .confops = &ocelot_confops,
> - .owner = THIS_MODULE,
> +static struct ocelot_match_data lan966x_desc = {
> + .desc = {
> + .name = "lan966x-pinctrl",
> + .pins = lan966x_pins,
> + .npins = ARRAY_SIZE(lan966x_pins),
> + .pctlops = &ocelot_pctl_ops,
> + .pmxops = &lan966x_pmx_ops,
> + .confops = &ocelot_confops,
> + .owner = THIS_MODULE,
> + },
> + .pincfg_data = {
> + .pd_bit = BIT(3),
> + .pu_bit = BIT(2),
> + .drive_bits = GENMASK(1, 0),
> + },
> };
>
> static int ocelot_create_group_func_map(struct device *dev,
> @@ -1913,6 +1956,7 @@ static struct regmap *ocelot_pinctrl_create_pincfg(struct platform_device *pdev)
>
> static int ocelot_pinctrl_probe(struct platform_device *pdev)
> {
> + const struct ocelot_match_data *data;
> struct device *dev = &pdev->dev;
> struct ocelot_pinctrl *info;
> struct reset_control *reset;
> @@ -1929,7 +1973,16 @@ static int ocelot_pinctrl_probe(struct platform_device *pdev)
> if (!info)
> return -ENOMEM;
>
> - info->desc = (struct pinctrl_desc *)device_get_match_data(dev);
> + data = device_get_match_data(dev);
> + if (!data)
> + return -EINVAL;
> +
> + info->desc = devm_kmemdup(dev, &data->desc, sizeof(*info->desc),
> + GFP_KERNEL);
> + if (!info->desc)
> + return -ENOMEM;
> +
> + info->pincfg_data = &data->pincfg_data;
>
> reset = devm_reset_control_get_optional_shared(dev, "switch");
> if (IS_ERR(reset))
> --
> 2.33.0
>
--
With Best Regards,
Andy Shevchenko
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