linux-kernel - Re: [PATCH] pinctrl: ingenic: Fix regmap on X series SoCs

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Date:   Thu, 10 Feb 2022 11:03:13 +0000
From:   Paul Cercueil <paul@...pouillou.net>
To:     Aidan MacDonald <aidanmacdonald.0x0@...il.com>
Cc:     linus.walleij@...aro.org, linux-mips@...r.kernel.org,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pinctrl: ingenic: Fix regmap on X series SoCs

Hi Aidan,

Le mer., févr. 9 2022 at 23:04:54 +0000, Aidan MacDonald 
<aidanmacdonald.0x0@...il.com> a écrit :
> The X series Ingenic SoCs have a shadow GPIO group which
> is at a higher offset than the other groups, and is used
> for all GPIO configuration. The regmap did not take this
> offset into account and set max_register too low. Writes
> to the shadow group registers were blocked, which made it
> impossible to change any pin configuration.
> 
> Fix this by pretending there are at least 8 chips on any
> 'X' SoC for the purposes of calculating max_register. This
> ensures the shadow group is accessible.

I don't like your solution, it sounds very hacky. I think it would make 
more sense to use a dedicated x1000_pinctrl_regmap_config that would be 
used for the X1000 SoC. That would also allow you to express that there 
are no registers in the 0x400-0x700 range (through 
regmap_config.wr_table / .rd_table).

Cheers,
-Paul

> Signed-off-by: Aidan MacDonald <aidanmacdonald.0x0@...il.com>
> ---
>  drivers/pinctrl/pinctrl-ingenic.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/pinctrl/pinctrl-ingenic.c 
> b/drivers/pinctrl/pinctrl-ingenic.c
> index 2712f51eb238..9d2bccda50f1 100644
> --- a/drivers/pinctrl/pinctrl-ingenic.c
> +++ b/drivers/pinctrl/pinctrl-ingenic.c
> @@ -4168,7 +4168,10 @@ static int __init ingenic_pinctrl_probe(struct 
> platform_device *pdev)
>  		return PTR_ERR(base);
> 
>  	regmap_config = ingenic_pinctrl_regmap_config;
> -	regmap_config.max_register = chip_info->num_chips * 
> chip_info->reg_offset;
> +	if (chip_info->version >= ID_X1000)
> +		regmap_config.max_register = MIN(8, chip_info->num_chips) * 
> chip_info->reg_offset;
> +	else
> +		regmap_config.max_register = chip_info->num_chips * 
> chip_info->reg_offset;
> 
>  	jzpc->map = devm_regmap_init_mmio(dev, base, &regmap_config);
>  	if (IS_ERR(jzpc->map)) {
> --
> 2.34.1
>