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Message-ID: <862d7d16-367b-492e-b7be-e2fe71b904c2@tuxon.dev>
Date: Thu, 30 May 2024 10:48:39 +0300
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Subject: Re: [PATCH v2 10/13] pinctrl: renesas: pinctrl-rzg2l: Add support to
 set pulling up/down the pins
Content-Language: en-US
To: Prabhakar <prabhakar.csengg@gmail.com>,
 Geert Uytterhoeven <geert+renesas@glider.be>,
 Linus Walleij <linus.walleij@linaro.org>, Rob Herring <robh@kernel.org>,
 Krzysztof Kozlowski <krzk+dt@kernel.org>, Conor Dooley
 <conor+dt@kernel.org>, Magnus Damm <magnus.damm@gmail.com>,
 linux-renesas-soc@vger.kernel.org
Cc: linux-gpio@vger.kernel.org, devicetree@vger.kernel.org,
 linux-kernel@vger.kernel.org, Biju Das <biju.das.jz@bp.renesas.com>,
 Fabrizio Castro <fabrizio.castro.jz@renesas.com>,
 Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
References: <20240423175900.702640-1-prabhakar.mahadev-lad.rj@bp.renesas.com>
 <20240423175900.702640-11-prabhakar.mahadev-lad.rj@bp.renesas.com>
From: claudiu beznea <claudiu.beznea@tuxon.dev>
In-Reply-To: <20240423175900.702640-11-prabhakar.mahadev-lad.rj@bp.renesas.com>
Content-Type: text/plain; charset=UTF-8
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Hi, Prabhakar,

On 23.04.2024 20:58, Prabhakar wrote:
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> 
> Add support to configure bias-disable, bias-pull-up and bias-pull-down
> properties of the pin.
> 
> Two new function pointers get_bias_param() and get_bias_val() are
> introduced as the values in PUPD register differ when compared to
> RZ/G2L family and RZ/V2H(P) SoC,
> 
> Value | RZ/G2L        | RZ/V2H
> ---------------------------------
> 00b:  | Bias Disabled | Pull up/down disabled
> 01b:  | Pull-up       | Pull up/down disabled
> 10b:  | Pull-down     | Pull-down
> 11b:  | Prohibited    | Pull-up
> 
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> ---
> RFC->v2
> - New patch
> ---
>  drivers/pinctrl/renesas/pinctrl-rzg2l.c | 73 +++++++++++++++++++++++++
>  1 file changed, 73 insertions(+)
> 
> diff --git a/drivers/pinctrl/renesas/pinctrl-rzg2l.c b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
> index 102fa75c71d3..c144bf43522b 100644
> --- a/drivers/pinctrl/renesas/pinctrl-rzg2l.c
> +++ b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
> @@ -122,6 +122,7 @@
>  #define IOLH(off)		(0x1000 + (off) * 8)
>  #define SR(off)			(0x1400 + (off) * 8)
>  #define IEN(off)		(0x1800 + (off) * 8)
> +#define PUPD(off)		(0x1C00 + (off) * 8)
>  #define ISEL(off)		(0x2C00 + (off) * 8)
>  #define SD_CH(off, ch)		((off) + (ch) * 4)
>  #define ETH_POC(off, ch)	((off) + (ch) * 4)
> @@ -140,6 +141,7 @@
>  #define IEN_MASK		0x01
>  #define IOLH_MASK		0x03
>  #define SR_MASK			0x01
> +#define PUPD_MASK		0x03
>  
>  #define PM_INPUT		0x1
>  #define PM_OUTPUT		0x2
> @@ -265,6 +267,8 @@ struct rzg2l_pinctrl_data {
>  	void (*pmc_writeb)(struct rzg2l_pinctrl *pctrl, u8 val, void __iomem *addr);
>  	u32 (*read_oen)(struct rzg2l_pinctrl *pctrl, u32 caps, u32 offset, u8 pin);
>  	int (*write_oen)(struct rzg2l_pinctrl *pctrl, u32 caps, u32 offset, u8 pin, u8 oen);
> +	int (*get_bias_param)(u8 val);
> +	int (*get_bias_val)(enum pin_config_param param);
>  };
>  
>  /**
> @@ -1081,6 +1085,38 @@ static int rzg2l_write_oen(struct rzg2l_pinctrl *pctrl, u32 caps, u32 offset, u8
>  	return 0;
>  }
>  
> +static int rzg2l_get_bias_param(u8 val)
> +{
> +	switch (val) {
> +	case 0:
> +		return PIN_CONFIG_BIAS_DISABLE;
> +	case 1:
> +		return PIN_CONFIG_BIAS_PULL_UP;
> +	case 2:
> +		return PIN_CONFIG_BIAS_PULL_DOWN;
> +	default:
> +		break;
> +	}
> +
> +	return -EINVAL;
> +}
> +
> +static int rzg2l_get_bias_val(enum pin_config_param param)
> +{
> +	switch (param) {
> +	case PIN_CONFIG_BIAS_DISABLE:
> +		return 0;
> +	case PIN_CONFIG_BIAS_PULL_UP:
> +		return 1;
> +	case PIN_CONFIG_BIAS_PULL_DOWN:
> +		return 2;
> +	default:
> +		break;
> +	}
> +
> +	return -EINVAL;
> +}
> +
>  static int rzg2l_pinctrl_pinconf_get(struct pinctrl_dev *pctldev,
>  				     unsigned int _pin,
>  				     unsigned long *config)
> @@ -1139,6 +1175,25 @@ static int rzg2l_pinctrl_pinconf_get(struct pinctrl_dev *pctldev,
>  		arg = rzg2l_read_pin_config(pctrl, SR(off), bit, SR_MASK);
>  		break;
>  
> +	case PIN_CONFIG_BIAS_DISABLE:
> +	case PIN_CONFIG_BIAS_PULL_UP:
> +	case PIN_CONFIG_BIAS_PULL_DOWN: {

Block { } can be removed here.

> +		if (!(cfg & PIN_CFG_PUPD))
> +			return -EINVAL;
> +
> +		ret = pctrl->data->get_bias_param(rzg2l_read_pin_config(pctrl,
> +									PUPD(off),
> +									bit, PUPD_MASK));
> +		if (ret < 0)
> +			return ret;
> +
> +		if (ret != param)
> +			return -EINVAL;

Can this happen? Otherwise it can be removed.

> +		/* for PIN_CONFIG_BIAS_PULL_UP/DOWN when enabled we just return 1 */

What about bias disable? I haven't checked in detail, is it OK to do
arg = 1 here?

> +		arg = 1;
> +		break;
> +	}
> +
>  	case PIN_CONFIG_DRIVE_STRENGTH: {
>  		unsigned int index;
>  
> @@ -1254,6 +1309,20 @@ static int rzg2l_pinctrl_pinconf_set(struct pinctrl_dev *pctldev,
>  			rzg2l_rmw_pin_config(pctrl, SR(off), bit, SR_MASK, arg);
>  			break;
>  
> +		case PIN_CONFIG_BIAS_DISABLE:
> +		case PIN_CONFIG_BIAS_PULL_UP:
> +		case PIN_CONFIG_BIAS_PULL_DOWN: {

Block { } can be removed in this case.

> +			if (!(cfg & PIN_CFG_PUPD))
> +				return -EINVAL;
> +
> +			ret = pctrl->data->get_bias_val(param);
> +			if (ret < 0)
> +				return ret;
> +
> +			rzg2l_rmw_pin_config(pctrl, PUPD(off), bit, PUPD_MASK, ret);
> +			break;
> +		}
> +
>  		case PIN_CONFIG_DRIVE_STRENGTH:
>  			arg = pinconf_to_config_argument(_configs[i]);
>  
> @@ -2746,6 +2815,8 @@ static struct rzg2l_pinctrl_data r9a07g044_data = {
>  	.pmc_writeb = &rzg2l_pmc_writeb,
>  	.read_oen = &rzg2l_read_oen,
>  	.write_oen = &rzg2l_write_oen,
> +	.get_bias_param = &rzg2l_get_bias_param,
> +	.get_bias_val = &rzg2l_get_bias_val,
>  };
>  
>  static struct rzg2l_pinctrl_data r9a08g045_data = {
> @@ -2761,6 +2832,8 @@ static struct rzg2l_pinctrl_data r9a08g045_data = {
>  	.pmc_writeb = &rzg2l_pmc_writeb,
>  	.read_oen = &rzg2l_read_oen,
>  	.write_oen = &rzg2l_write_oen,
> +	.get_bias_param = &rzg2l_get_bias_param,
> +	.get_bias_val = &rzg2l_get_bias_val,
>  };
>  
>  static const struct of_device_id rzg2l_pinctrl_of_table[] = {