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

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Message-ID: <20210609041227.GB14839@aspeedtech.com>
Date:   Wed, 9 Jun 2021 12:12:28 +0800
From:   Steven Lee <steven_lee@...eedtech.com>
To:     Andrew Jeffery <andrew@...id.au>
CC:     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>,
        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.

The 06/09/2021 08:55, Andrew Jeffery wrote:
> 
> 
> 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.
> 

I was wondering if I can squash patch-05 and patch-06 into one patch
as this patch(patch-06) requires macros, structures, and functions that
modified in the previous patch(patch-05).

Thanks,
Steven

> Andrew