linux-kernel - Re: [PATCH v4] pinctrl: aspeed: Fix ast2500 strap register write logic

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Date:   Fri, 18 Aug 2017 11:06:22 +0930
From:   Andrew Jeffery <andrew@...id.au>
To:     Yong Li <sdliyong@...il.com>, linus.walleij@...aro.org,
        joel@....id.au, arnd@...db.de, raltherr@...gle.com,
        robh@...nel.org, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] pinctrl: aspeed: Fix ast2500 strap register write
 logic

On Fri, 2017-08-18 at 06:53 +0800, Yong Li wrote:
> On AST2500, the hardware strap register(SCU70) only accepts write ‘1’,
> to clear it to ‘0’, must set bits(write  ‘1’) to SCU7C
> 
> Signed-off-by: Yong Li <sdliyong@...il.com>

Take 2 ;)

Reviewed-by: Andrew Jeffery <andrew@...id.au>
Tested-by: Andrew Jeffery <andrew@...id.au>

Cheers,

Andrew

> ---
>  drivers/pinctrl/aspeed/pinctrl-aspeed.c | 21 +++++++++++++++++++++
>  drivers/pinctrl/aspeed/pinctrl-aspeed.h |  1 +
>  2 files changed, 22 insertions(+)
> 
> diff --git a/drivers/pinctrl/aspeed/pinctrl-aspeed.c b/drivers/pinctrl/aspeed/pinctrl-aspeed.c
> index a86a4d6..7f13ce8 100644
> --- a/drivers/pinctrl/aspeed/pinctrl-aspeed.c
> +++ b/drivers/pinctrl/aspeed/pinctrl-aspeed.c
> @@ -213,6 +213,27 @@ static int aspeed_sig_expr_set(const struct aspeed_sig_expr *expr,
> >  		if (desc->ip == ASPEED_IP_SCU && desc->reg == HW_STRAP2)
> >  			continue;
>  
> > +		/* On AST2500, Set bits in SCU7C are cleared from SCU70 */
> > +		if (desc->ip == ASPEED_IP_SCU && desc->reg == HW_STRAP1) {
> > +			unsigned int rev_id;
> +
> > +			ret = regmap_read(maps[ASPEED_IP_SCU],
> > +				HW_REVISION_ID, &rev_id);
> > +			if (ret < 0)
> > +				return ret;
> +
> > +			if (0x04 == (rev_id >> 24)) {
> > +				u32 value = ~val & desc->mask;
> +
> > +				if (value) {
> > +					ret = regmap_write(maps[desc->ip],
> > +						HW_REVISION_ID, value);
> > +					if (ret < 0)
> > +						return ret;
> > +				}
> > +			}
> > +		}
> +
> >  		ret = regmap_update_bits(maps[desc->ip], desc->reg,
> >  					 desc->mask, val);
>  
> diff --git a/drivers/pinctrl/aspeed/pinctrl-aspeed.h b/drivers/pinctrl/aspeed/pinctrl-aspeed.h
> index fa125db..d4d7f03 100644
> --- a/drivers/pinctrl/aspeed/pinctrl-aspeed.h
> +++ b/drivers/pinctrl/aspeed/pinctrl-aspeed.h
> @@ -251,6 +251,7 @@
>  #define SCU3C           0x3C /* System Reset Control/Status Register */
>  #define SCU48           0x48 /* MAC Interface Clock Delay Setting */
>  #define HW_STRAP1       0x70 /* AST2400 strapping is 33 bits, is split */
> +#define HW_REVISION_ID  0x7C /* Silicon revision ID register */
>  #define SCU80           0x80 /* Multi-function Pin Control #1 */
>  #define SCU84           0x84 /* Multi-function Pin Control #2 */
>  #define SCU88           0x88 /* Multi-function Pin Control #3 */
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