linux-kernel - Re: [PATCH v2 2/3] pinctrl: renesas: rzg2l: Add support for enabling/disabling open-drain outputs

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Message-ID: <bb4bf1af-ea62-433d-ab5e-982055a4cec9@tuxon.dev>
Date: Wed, 9 Oct 2024 10:53:19 +0300
From: claudiu beznea <claudiu.beznea@...on.dev>
To: Prabhakar <prabhakar.csengg@...il.com>,
 Geert Uytterhoeven <geert+renesas@...der.be>,
 Linus Walleij <linus.walleij@...aro.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Magnus Damm <magnus.damm@...il.com>
Cc: devicetree@...r.kernel.org, linux-gpio@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
 Biju Das <biju.das.jz@...renesas.com>,
 Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
 Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH v2 2/3] pinctrl: renesas: rzg2l: Add support for
 enabling/disabling open-drain outputs



On 04.10.2024 15:36, Prabhakar wrote:
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> 
> Add support for enabling and disabling open-drain outputs.
> 
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>

I gave it a simple try on RZ/G3S. All good. You can add:

Tested-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>

> ---
> v1->v2
> - Implemented PIN_CONFIG_DRIVE_OPEN_DRAIN to disable open drain
> ---
>  drivers/pinctrl/renesas/pinctrl-rzg2l.c | 23 +++++++++++++++++++++++
>  1 file changed, 23 insertions(+)
> 
> diff --git a/drivers/pinctrl/renesas/pinctrl-rzg2l.c b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
> index b2d309f742af..8d576cc74003 100644
> --- a/drivers/pinctrl/renesas/pinctrl-rzg2l.c
> +++ b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
> @@ -139,6 +139,7 @@
>  #define IEN(off)		(0x1800 + (off) * 8)
>  #define PUPD(off)		(0x1C00 + (off) * 8)
>  #define ISEL(off)		(0x2C00 + (off) * 8)
> +#define NOD(off)		(0x3000 + (off) * 8)
>  #define SD_CH(off, ch)		((off) + (ch) * 4)
>  #define ETH_POC(off, ch)	((off) + (ch) * 4)
>  #define QSPI			(0x3008)
> @@ -160,6 +161,7 @@
>  #define IOLH_MASK		0x03
>  #define SR_MASK			0x01
>  #define PUPD_MASK		0x03
> +#define NOD_MASK		0x01
>  
>  #define PM_INPUT		0x1
>  #define PM_OUTPUT		0x2
> @@ -1337,6 +1339,18 @@ static int rzg2l_pinctrl_pinconf_get(struct pinctrl_dev *pctldev,
>  		break;
>  	}
>  
> +	case PIN_CONFIG_DRIVE_OPEN_DRAIN:
> +	case PIN_CONFIG_DRIVE_PUSH_PULL:
> +		if (!(cfg & PIN_CFG_NOD))
> +			return -EINVAL;
> +
> +		arg = rzg2l_read_pin_config(pctrl, NOD(off), bit, NOD_MASK);
> +		if (!arg && param != PIN_CONFIG_DRIVE_PUSH_PULL)
> +			return -EINVAL;
> +		if (arg && param != PIN_CONFIG_DRIVE_OPEN_DRAIN)
> +			return -EINVAL;
> +		break;
> +
>  	case RENESAS_RZV2H_PIN_CONFIG_OUTPUT_IMPEDANCE:
>  		if (!(cfg & PIN_CFG_IOLH_RZV2H))
>  			return -EINVAL;
> @@ -1466,6 +1480,15 @@ static int rzg2l_pinctrl_pinconf_set(struct pinctrl_dev *pctldev,
>  			rzg2l_rmw_pin_config(pctrl, IOLH(off), bit, IOLH_MASK, index);
>  			break;
>  
> +		case PIN_CONFIG_DRIVE_OPEN_DRAIN:
> +		case PIN_CONFIG_DRIVE_PUSH_PULL:
> +			if (!(cfg & PIN_CFG_NOD))
> +				return -EINVAL;
> +
> +			rzg2l_rmw_pin_config(pctrl, NOD(off), bit, NOD_MASK,
> +					     param == PIN_CONFIG_DRIVE_OPEN_DRAIN ? 1 : 0);
> +			break;
> +
>  		case RENESAS_RZV2H_PIN_CONFIG_OUTPUT_IMPEDANCE:
>  			if (!(cfg & PIN_CFG_IOLH_RZV2H))
>  				return -EINVAL;