linux-kernel - Re: [PATCH v2 2/4] gpio: aspeed: Remove the name for bank array

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Message-ID: <7e2643f7586a7ed5d3cc90630d78fb3abd813a54.camel@codeconstruct.com.au>
Date: Thu, 12 Sep 2024 17:21:27 +0930
From: Andrew Jeffery <andrew@...econstruct.com.au>
To: Billy Tsai <billy_tsai@...eedtech.com>, linus.walleij@...aro.org, 
	brgl@...ev.pl, robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org, 
	joel@....id.au, linux-gpio@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, linux-aspeed@...ts.ozlabs.org, 
	linux-kernel@...r.kernel.org, BMC-SW@...eedtech.com
Subject: Re: [PATCH v2 2/4] gpio: aspeed: Remove the name for bank array

On Fri, 2024-08-30 at 11:40 +0800, Billy Tsai wrote:
> The bank array name is only used to determine if the GPIO offset is valid,
> and this condition can be replaced by checking if the offset exceeds the
> ngpio property.
> 
> Signed-off-by: Billy Tsai <billy_tsai@...eedtech.com>
> ---
>  drivers/gpio/gpio-aspeed.c | 17 ++++-------------
>  1 file changed, 4 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/gpio/gpio-aspeed.c b/drivers/gpio/gpio-aspeed.c
> index 04c03402db6d..24f50a0ea4ab 100644
> --- a/drivers/gpio/gpio-aspeed.c
> +++ b/drivers/gpio/gpio-aspeed.c
> @@ -77,7 +77,6 @@ struct aspeed_gpio_bank {
>  	uint16_t	debounce_regs;
>  	uint16_t	tolerance_regs;
>  	uint16_t	cmdsrc_regs;
> -	const char	names[4][3];
>  };
>  
>  /*
> @@ -104,7 +103,6 @@ static const struct aspeed_gpio_bank aspeed_gpio_banks[] = {
>  		.debounce_regs = 0x0040,
>  		.tolerance_regs = 0x001c,
>  		.cmdsrc_regs = 0x0060,
> -		.names = { "A", "B", "C", "D" },
>  	},
>  	{
>  		.val_regs = 0x0020,
> @@ -113,7 +111,6 @@ static const struct aspeed_gpio_bank aspeed_gpio_banks[] = {
>  		.debounce_regs = 0x0048,
>  		.tolerance_regs = 0x003c,
>  		.cmdsrc_regs = 0x0068,
> -		.names = { "E", "F", "G", "H" },
>  	},
>  	{
>  		.val_regs = 0x0070,
> @@ -122,7 +119,6 @@ static const struct aspeed_gpio_bank aspeed_gpio_banks[] = {
>  		.debounce_regs = 0x00b0,
>  		.tolerance_regs = 0x00ac,
>  		.cmdsrc_regs = 0x0090,
> -		.names = { "I", "J", "K", "L" },
>  	},
>  	{
>  		.val_regs = 0x0078,
> @@ -131,7 +127,6 @@ static const struct aspeed_gpio_bank aspeed_gpio_banks[] = {
>  		.debounce_regs = 0x0100,
>  		.tolerance_regs = 0x00fc,
>  		.cmdsrc_regs = 0x00e0,
> -		.names = { "M", "N", "O", "P" },
>  	},
>  	{
>  		.val_regs = 0x0080,
> @@ -140,7 +135,6 @@ static const struct aspeed_gpio_bank aspeed_gpio_banks[] = {
>  		.debounce_regs = 0x0130,
>  		.tolerance_regs = 0x012c,
>  		.cmdsrc_regs = 0x0110,
> -		.names = { "Q", "R", "S", "T" },
>  	},
>  	{
>  		.val_regs = 0x0088,
> @@ -149,7 +143,6 @@ static const struct aspeed_gpio_bank aspeed_gpio_banks[] = {
>  		.debounce_regs = 0x0160,
>  		.tolerance_regs = 0x015c,
>  		.cmdsrc_regs = 0x0140,
> -		.names = { "U", "V", "W", "X" },
>  	},
>  	{
>  		.val_regs = 0x01E0,
> @@ -158,7 +151,6 @@ static const struct aspeed_gpio_bank aspeed_gpio_banks[] = {
>  		.debounce_regs = 0x0190,
>  		.tolerance_regs = 0x018c,
>  		.cmdsrc_regs = 0x0170,
> -		.names = { "Y", "Z", "AA", "AB" },
>  	},
>  	{
>  		.val_regs = 0x01e8,
> @@ -167,7 +159,6 @@ static const struct aspeed_gpio_bank aspeed_gpio_banks[] = {
>  		.debounce_regs = 0x01c0,
>  		.tolerance_regs = 0x01bc,
>  		.cmdsrc_regs = 0x01a0,
> -		.names = { "AC", "", "", "" },
>  	},
>  };
>  
> @@ -280,11 +271,11 @@ static inline const struct aspeed_bank_props *find_bank_props(
>  static inline bool have_gpio(struct aspeed_gpio *gpio, unsigned int offset)
>  {
>  	const struct aspeed_bank_props *props = find_bank_props(gpio, offset);
> -	const struct aspeed_gpio_bank *bank = to_bank(offset);
> -	unsigned int group = GPIO_OFFSET(offset) / 8;
>  
> -	return bank->names[group][0] != '\0' &&
> -		(!props || ((props->input | props->output) & GPIO_BIT(offset)));
> +	if (offset > gpio->chip.ngpio)

Should this be `>=`? ngpio is a count.

Andrew

> +		return false;
> +
> +	return (!props || ((props->input | props->output) & GPIO_BIT(offset)));
>  }
>  
>  static inline bool have_input(struct aspeed_gpio *gpio, unsigned int offset)