linux-kernel - Re: [PATCH] pinctrl: microchip-sgpio: Fix support for regmap

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Message-ID: <20220125164659.GA31440@COLIN-DESKTOP1.localdomain>
Date:   Tue, 25 Jan 2022 08:46:59 -0800
From:   Colin Foster <colin.foster@...advantage.com>
To:     Horatiu Vultur <horatiu.vultur@...rochip.com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org, lars.povlsen@...rochip.com,
        Steen.Hegelund@...rochip.com, UNGLinuxDriver@...rochip.com,
        linus.walleij@...aro.org
Subject: Re: [PATCH] pinctrl: microchip-sgpio: Fix support for regmap

Hi Horatiu,

On Tue, Jan 25, 2022 at 05:12:45PM +0100, Horatiu Vultur wrote:
> Initially the driver accessed the registers using u32 __iomem but then
> in the blamed commit it changed it to use regmap. The problem is that now
> the offset of the registers is not calculated anymore at word offset but
> at byte offset. Therefore make sure to multiply the offset with word size.
> 

Sorry about this one. I see it must have slipped through the cracks
because I had made the same change in my tree. The only difference is I
had copied reg_stride into sgpio_priv instead of making regmap_config
file-scope. For what its worth, with apologies:

Reviewed-by: Colin Foster <colin.foster@...advantage.com>

> Fixes: 2afbbab45c261a ("pinctrl: microchip-sgpio: update to support regmap")
> Signed-off-by: Horatiu Vultur <horatiu.vultur@...rochip.com>
> ---
>  drivers/pinctrl/pinctrl-microchip-sgpio.c | 13 +++++++------
>  1 file changed, 7 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/pinctrl/pinctrl-microchip-sgpio.c b/drivers/pinctrl/pinctrl-microchip-sgpio.c
> index 8e081c90bdb2..2999c98bbdee 100644
> --- a/drivers/pinctrl/pinctrl-microchip-sgpio.c
> +++ b/drivers/pinctrl/pinctrl-microchip-sgpio.c
> @@ -98,6 +98,12 @@ static const struct sgpio_properties properties_sparx5 = {
>  	.regoff = { 0x00, 0x06, 0x26, 0x04, 0x05, 0x2a, 0x32, 0x3a, 0x3e, 0x42 },
>  };
>  
> +static const struct regmap_config regmap_config = {
> +		.reg_bits = 32,
> +		.val_bits = 32,
> +		.reg_stride = 4,
> +};
> +
>  static const char * const functions[] = { "gpio" };
>  
>  struct sgpio_bank {
> @@ -137,7 +143,7 @@ static inline int sgpio_addr_to_pin(struct sgpio_priv *priv, int port, int bit)
>  
>  static inline u32 sgpio_get_addr(struct sgpio_priv *priv, u32 rno, u32 off)
>  {
> -	return priv->properties->regoff[rno] + off;
> +	return (priv->properties->regoff[rno] + off) * regmap_config.reg_stride;
>  }
>  
>  static u32 sgpio_readl(struct sgpio_priv *priv, u32 rno, u32 off)
> @@ -821,11 +827,6 @@ static int microchip_sgpio_probe(struct platform_device *pdev)
>  	struct clk *clk;
>  	u32 __iomem *regs;
>  	u32 val;
> -	struct regmap_config regmap_config = {
> -		.reg_bits = 32,
> -		.val_bits = 32,
> -		.reg_stride = 4,
> -	};
>  
>  	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
>  	if (!priv)
> -- 
> 2.33.0
>