linux-kernel - Re: [RFC PATCH 08/13] pinctrl: renesas: pinctrl-rzg2l: Add function pointers for writing to PFC

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Date: Thu, 28 Mar 2024 10:02:49 +0200
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 <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Magnus Damm <magnus.damm@...il.com>
Cc: linux-renesas-soc@...r.kernel.org, linux-gpio@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
 Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [RFC PATCH 08/13] pinctrl: renesas: pinctrl-rzg2l: Add function
 pointers for writing to PFC

Hi, Prabhakar,

On 27.03.2024 00:28, Prabhakar wrote:
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> 
> On the RZ/G2L SoC, the PFCWE bit controls writing to PFC registers.
> However, on the RZ/V2H(P) SoC, the PFCWE (REGWE_A on RZ/V2H) bit controls
> writing to both PFC and PMC registers. To accommodate these differences
> across SoC variants, introduce set_pfc_mode() and pm_set_pfc() function
> pointers.

I think the overall code can be simplified if you add  1 function that does
the lock/unlock for PWPR. See patch 13.

> 
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> ---
>  drivers/pinctrl/renesas/pinctrl-rzg2l.c | 14 ++++++++++++--
>  1 file changed, 12 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/pinctrl/renesas/pinctrl-rzg2l.c b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
> index 705372faaeff..4cdebdbd8a04 100644
> --- a/drivers/pinctrl/renesas/pinctrl-rzg2l.c
> +++ b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
> @@ -246,6 +246,8 @@ struct rzg2l_variable_pin_cfg {
>  	u32 pin:3;
>  };
>  
> +struct rzg2l_pinctrl;
> +
>  struct rzg2l_pinctrl_data {
>  	const char * const *port_pins;
>  	const u64 *port_pin_configs;
> @@ -256,6 +258,8 @@ struct rzg2l_pinctrl_data {
>  	const struct rzg2l_hwcfg *hwcfg;
>  	const struct rzg2l_variable_pin_cfg *variable_pin_cfg;
>  	unsigned int n_variable_pin_cfg;
> +	void (*set_pfc_mode)(struct rzg2l_pinctrl *pctrl, u8 pin, u8 off, u8 func);
> +	void (*pm_set_pfc)(struct rzg2l_pinctrl *pctrl);
>  };
>  
>  /**
> @@ -526,7 +530,7 @@ static int rzg2l_pinctrl_set_mux(struct pinctrl_dev *pctldev,
>  		dev_dbg(pctrl->dev, "port:%u pin: %u off:%x PSEL:%u\n",
>  			RZG2L_PIN_ID_TO_PORT(pins[i]), pin, off, psel_val[i] - hwcfg->func_base);
>  
> -		rzg2l_pinctrl_set_pfc_mode(pctrl, pin, off, psel_val[i] - hwcfg->func_base);
> +		pctrl->data->set_pfc_mode(pctrl, pin, off, psel_val[i] - hwcfg->func_base);
>  	}
>  
>  	return 0;
> @@ -2607,7 +2611,7 @@ static int rzg2l_pinctrl_resume_noirq(struct device *dev)
>  			writeb(cache->eth_poc[i], pctrl->base + ETH_POC(regs->eth_poc, i));
>  	}
>  
> -	rzg2l_pinctrl_pm_setup_pfc(pctrl);
> +	pctrl->data->pm_set_pfc(pctrl);
>  	rzg2l_pinctrl_pm_setup_regs(pctrl, false);
>  	rzg2l_pinctrl_pm_setup_dedicated_regs(pctrl, false);
>  	rzg2l_gpio_irq_restore(pctrl);
> @@ -2672,6 +2676,8 @@ static struct rzg2l_pinctrl_data r9a07g043_data = {
>  	.variable_pin_cfg = r9a07g043f_variable_pin_cfg,
>  	.n_variable_pin_cfg = ARRAY_SIZE(r9a07g043f_variable_pin_cfg),
>  #endif
> +	.set_pfc_mode = &rzg2l_pinctrl_set_pfc_mode,
> +	.pm_set_pfc = &rzg2l_pinctrl_pm_setup_pfc,
>  };
>  
>  static struct rzg2l_pinctrl_data r9a07g044_data = {
> @@ -2683,6 +2689,8 @@ static struct rzg2l_pinctrl_data r9a07g044_data = {
>  	.n_dedicated_pins = ARRAY_SIZE(rzg2l_dedicated_pins.common) +
>  		ARRAY_SIZE(rzg2l_dedicated_pins.rzg2l_pins),
>  	.hwcfg = &rzg2l_hwcfg,
> +	.set_pfc_mode = &rzg2l_pinctrl_set_pfc_mode,
> +	.pm_set_pfc = &rzg2l_pinctrl_pm_setup_pfc,
>  };
>  
>  static struct rzg2l_pinctrl_data r9a08g045_data = {
> @@ -2693,6 +2701,8 @@ static struct rzg2l_pinctrl_data r9a08g045_data = {
>  	.n_port_pins = ARRAY_SIZE(r9a08g045_gpio_configs) * RZG2L_PINS_PER_PORT,
>  	.n_dedicated_pins = ARRAY_SIZE(rzg3s_dedicated_pins),
>  	.hwcfg = &rzg3s_hwcfg,
> +	.set_pfc_mode = &rzg2l_pinctrl_set_pfc_mode,
> +	.pm_set_pfc = &rzg2l_pinctrl_pm_setup_pfc,
>  };
>  
>  static const struct of_device_id rzg2l_pinctrl_of_table[] = {