linux-kernel - Re: [PATCH v5 06/10] gpio: gpio-aspeed-sgpio: Add AST2400 and AST2500 platform data.

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Message-Id: <6f87ccf4-9b8f-4c67-84a1-e83a2ee5103b@www.fastmail.com>
Date:   Wed, 09 Jun 2021 10:25:08 +0930
From:   "Andrew Jeffery" <andrew@...id.au>
To:     "Steven Lee" <steven_lee@...eedtech.com>,
        "Linus Walleij" <linus.walleij@...aro.org>,
        "Bartosz Golaszewski" <bgolaszewski@...libre.com>,
        "Rob Herring" <robh+dt@...nel.org>,
        "Joel Stanley" <joel@....id.au>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "moderated list:ARM/ASPEED MACHINE SUPPORT" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/ASPEED MACHINE SUPPORT" 
        <linux-aspeed@...ts.ozlabs.org>,
        "open list" <linux-kernel@...r.kernel.org>
Cc:     "Hongwei Zhang" <Hongweiz@....com>,
        "Ryan Chen" <ryan_chen@...eedtech.com>,
        "Billy Tsai" <billy_tsai@...eedtech.com>
Subject: Re: [PATCH v5 06/10] gpio: gpio-aspeed-sgpio: Add AST2400 and AST2500 platform data.



On Tue, 8 Jun 2021, at 19:55, Steven Lee wrote:
> We use platform data to store GPIO pin mask and the max number of
> available GPIO pins for AST2600.
> Refactor driver to also add the platform data for AST2400/AST2500 and
> remove unused MAX_NR_HW_SGPIO and ASPEED_SGPIO_PINS_MASK macros.
> 
> Signed-off-by: Steven Lee <steven_lee@...eedtech.com>
> ---
>  drivers/gpio/gpio-aspeed-sgpio.c | 34 +++++++++++---------------------
>  1 file changed, 12 insertions(+), 22 deletions(-)
> 
> diff --git a/drivers/gpio/gpio-aspeed-sgpio.c b/drivers/gpio/gpio-aspeed-sgpio.c
> index ea20a0127748..7d0a4f6fd9d1 100644
> --- a/drivers/gpio/gpio-aspeed-sgpio.c
> +++ b/drivers/gpio/gpio-aspeed-sgpio.c
> @@ -17,21 +17,8 @@
>  #include <linux/spinlock.h>
>  #include <linux/string.h>
>  
> -/*
> - * MAX_NR_HW_GPIO represents the number of actual hardware-supported GPIOs (ie,
> - * slots within the clocked serial GPIO data). Since each HW GPIO is both an
> - * input and an output, we provide MAX_NR_HW_GPIO * 2 lines on our gpiochip
> - * device.
> - *
> - * We use SGPIO_OUTPUT_OFFSET to define the split between the inputs and
> - * outputs; the inputs start at line 0, the outputs start at OUTPUT_OFFSET.
> - */
> -#define MAX_NR_HW_SGPIO			80
> -#define SGPIO_OUTPUT_OFFSET		MAX_NR_HW_SGPIO
> -
>  #define ASPEED_SGPIO_CTRL		0x54
>  
> -#define ASPEED_SGPIO_PINS_MASK		GENMASK(9, 6)
>  #define ASPEED_SGPIO_CLK_DIV_MASK	GENMASK(31, 16)
>  #define ASPEED_SGPIO_ENABLE		BIT(0)
>  #define ASPEED_SGPIO_PINS_SHIFT		6
> @@ -484,6 +471,11 @@ static int aspeed_sgpio_setup_irqs(struct 
> aspeed_sgpio *gpio,
>  	return 0;
>  }
>  
> +static const struct aspeed_sgpio_pdata ast2400_sgpio_pdata = {
> +	.max_ngpios = 80,
> +	.pin_mask = GENMASK(9, 6),
> +};
> +
>  static const struct aspeed_sgpio_pdata ast2600_sgpiom_128_pdata = {
>  	.max_ngpios = 128,
>  	.pin_mask = GENMASK(10, 6),
> @@ -495,8 +487,8 @@ static const struct aspeed_sgpio_pdata 
> ast2600_sgpiom_80_pdata = {
>  };
>  
>  static const struct of_device_id aspeed_sgpio_of_table[] = {
> -	{ .compatible = "aspeed,ast2400-sgpio" },
> -	{ .compatible = "aspeed,ast2500-sgpio" },
> +	{ .compatible = "aspeed,ast2400-sgpio", .data = &ast2400_sgpio_pdata, 
> },
> +	{ .compatible = "aspeed,ast2500-sgpio", .data = &ast2400_sgpio_pdata, 
> },
>  	{ .compatible = "aspeed,ast2600-sgpiom-128", .data = 
> &ast2600_sgpiom_128_pdata, },
>  	{ .compatible = "aspeed,ast2600-sgpiom-80", .data = 
> &ast2600_sgpiom_80_pdata, },
>  	{}
> @@ -521,13 +513,11 @@ static int __init aspeed_sgpio_probe(struct 
> platform_device *pdev)
>  		return PTR_ERR(gpio->base);
>  
>  	pdata = device_get_match_data(&pdev->dev);
> -	if (pdata) {
> -		gpio->max_ngpios = pdata->max_ngpios;
> -		pin_mask = pdata->pin_mask;
> -	} else {
> -		gpio->max_ngpios = MAX_NR_HW_SGPIO;
> -		pin_mask = ASPEED_SGPIO_PINS_MASK;
> -	}
> +	if (!pdata)
> +		return -EINVAL;
> +
> +	gpio->max_ngpios = pdata->max_ngpios;
> +	pin_mask = pdata->pin_mask;

Hmm, okay, maybe just re-order the patches so this commit comes before the previous one. That way we don't immediately rip out this condition that we just introduced in the previous patch.

I think I suggested squashing it into the previous patch, but with the removal of the comments and macros I think it's worth leaving it separate, just reordered.

Andrew