linux-kernel - Re: [PATCH 1/1] pinctrl: aspeed-g6: Add NCSI pin group config

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Date: Mon, 17 Jun 2024 17:03:11 +0930
From: Andrew Jeffery <andrew@...econstruct.com.au>
To: Potin Lai <potin.lai.pt@...il.com>, Linus Walleij
 <linus.walleij@...aro.org>,  Joel Stanley <joel@....id.au>
Cc: linux-aspeed@...ts.ozlabs.org, openbmc@...ts.ozlabs.org, 
 linux-gpio@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-kernel@...r.kernel.org, Patrick Williams <patrick@...cx.xyz>, Cosmo
 Chou <cosmo.chou@...ntatw.com>, Potin Lai <potin.lai@...ntatw.com>
Subject: Re: [PATCH 1/1] pinctrl: aspeed-g6: Add NCSI pin group config

On Thu, 2024-06-13 at 16:07 +0800, Potin Lai wrote:
> In the NCSI pin table, the reference clock output pin (RMIIXRCLKO) is not
> needed on the management controller side.
> 
> To optimize pin usage, add new NCSI pin groupis that excludes RMIIXRCLKO,
> reducing the number of required pins.

Hmm, I'm not convinced this is specific to NCSI (and it's an
unfortunate mistake on my part), but we do need to call the groups
something different than RMII[34]. Did you have any other suggestions?

> 
> Signed-off-by: Potin Lai <potin.lai.pt@...il.com>
> ---
>  drivers/pinctrl/aspeed/pinctrl-aspeed-g6.c | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/pinctrl/aspeed/pinctrl-aspeed-g6.c b/drivers/pinctrl/aspeed/pinctrl-aspeed-g6.c
> index 7938741136a2c..31e4e0b342a00 100644
> --- a/drivers/pinctrl/aspeed/pinctrl-aspeed-g6.c
> +++ b/drivers/pinctrl/aspeed/pinctrl-aspeed-g6.c
> @@ -249,7 +249,9 @@ PIN_DECL_2(E26, GPIOD3, RGMII3RXD3, RMII3RXER);
>  
>  FUNC_GROUP_DECL(RGMII3, H24, J22, H22, H23, G22, F22, G23, G24, F23, F26, F25,
>  		E26);
> -FUNC_GROUP_DECL(RMII3, H24, J22, H22, H23, G23, F23, F26, F25, E26);
> +GROUP_DECL(RMII3, H24, J22, H22, H23, G23, F23, F26, F25, E26);
> +GROUP_DECL(NCSI3, J22, H22, H23, G23, F23, F26, F25, E26);
> +FUNC_DECL_2(RMII3, RMII3, NCSI3);
>  
>  #define F24 28
>  SIG_EXPR_LIST_DECL_SESG(F24, NCTS3, NCTS3, SIG_DESC_SET(SCU410, 28));
> @@ -355,7 +357,9 @@ FUNC_GROUP_DECL(NRTS4, B24);
>  
>  FUNC_GROUP_DECL(RGMII4, F24, E23, E24, E25, D26, D24, C25, C26, C24, B26, B25,
>  		B24);
> -FUNC_GROUP_DECL(RMII4, F24, E23, E24, E25, C25, C24, B26, B25, B24);
> +GROUP_DECL(RMII4, F24, E23, E24, E25, C25, C24, B26, B25, B24);
> +GROUP_DECL(NCSI4, E23, E24, E25, C25, C24, B26, B25, B24);
> +FUNC_DECL_2(RMII4, RMII4, NCSI4);
>  
>  #define D22 40
>  SIG_EXPR_LIST_DECL_SESG(D22, SD1CLK, SD1, SIG_DESC_SET(SCU414, 8));
> @@ -1976,6 +1980,8 @@ static const struct aspeed_pin_group aspeed_g6_groups[] = {
>  	ASPEED_PINCTRL_GROUP(MDIO2),
>  	ASPEED_PINCTRL_GROUP(MDIO3),
>  	ASPEED_PINCTRL_GROUP(MDIO4),
> +	ASPEED_PINCTRL_GROUP(NCSI3),
> +	ASPEED_PINCTRL_GROUP(NCSI4),

You will need to update the binding document as well. I've poked Linus
W about a series I sent that re-formats the binding function and group
lists - it would be nice if you rework the patch on top of that:

https://lore.kernel.org/lkml/5bf8e1dddd2b958a102e7b1b9f9c080a34f9deff.camel@codeconstruct.com.au/

Cheers,

Andrew