linux-kernel - Re: [PATCH v3 26/42] ata: pata_ep93xx: add device tree support

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Message-ID: <e7350d62-8dc2-8bae-e514-3b99c3abaf74@omp.ru>
Date:   Thu, 20 Jul 2023 12:45:54 +0300
From:   Sergey Shtylyov <s.shtylyov@....ru>
To:     <nikita.shubin@...uefel.me>,
        Hartley Sweeten <hsweeten@...ionengravers.com>,
        Lennert Buytenhek <kernel@...tstofly.org>,
        Alexander Sverdlin <alexander.sverdlin@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Lukasz Majewski <lukma@...x.de>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Alessandro Zummo <a.zummo@...ertech.it>,
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        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Sebastian Reichel <sre@...nel.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
        Mark Brown <broonie@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
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        Vignesh Raghavendra <vigneshr@...com>,
        Damien Le Moal <dlemoal@...nel.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
        <soc@...nel.org>, Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Andy Shevchenko <andy@...nel.org>,
        Michael Peters <mpeters@...eddedTS.com>,
        Kris Bahnsen <kris@...eddedTS.com>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-gpio@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-clk@...r.kernel.org>,
        <linux-rtc@...r.kernel.org>, <linux-watchdog@...r.kernel.org>,
        <linux-pm@...r.kernel.org>, <linux-pwm@...r.kernel.org>,
        <linux-spi@...r.kernel.org>, <netdev@...r.kernel.org>,
        <dmaengine@...r.kernel.org>, <linux-mtd@...ts.infradead.org>,
        <linux-ide@...r.kernel.org>, <linux-input@...r.kernel.org>,
        <alsa-devel@...a-project.org>
Subject: Re: [PATCH v3 26/42] ata: pata_ep93xx: add device tree support

On 7/20/23 2:29 PM, Nikita Shubin via B4 Relay wrote:

> From: Nikita Shubin <nikita.shubin@...uefel.me>
> 
> - Add OF ID match table
> - Drop ep93xx_chip_revision and use soc_device_match instead
> 
> Signed-off-by: Nikita Shubin <nikita.shubin@...uefel.me>
> ---
>  drivers/ata/pata_ep93xx.c | 26 ++++++++++++++++++++------
>  1 file changed, 20 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/ata/pata_ep93xx.c b/drivers/ata/pata_ep93xx.c
> index c6e043e05d43..a88824dfc5fa 100644
> --- a/drivers/ata/pata_ep93xx.c
> +++ b/drivers/ata/pata_ep93xx.c
[...]
> @@ -910,6 +912,12 @@ static struct ata_port_operations ep93xx_pata_port_ops = {
>  	.port_start		= ep93xx_pata_port_start,
>  };
>  
> +static const struct soc_device_attribute ep93xx_soc_table[] = {
> +	{ .revision = "E1", .data = (void *)ATA_UDMA3 },
> +	{ .revision = "E2", .data = (void *)ATA_UDMA4 },
> +	{ /* sentinel */ }
> +};
> +
>  static int ep93xx_pata_probe(struct platform_device *pdev)
>  {
>  	struct ep93xx_pata_data *drv_data;
> @@ -939,7 +947,7 @@ static int ep93xx_pata_probe(struct platform_device *pdev)
>  
>  	drv_data = devm_kzalloc(&pdev->dev, sizeof(*drv_data), GFP_KERNEL);
>  	if (!drv_data) {
> -		err = -ENXIO;
> +		err = -ENOMEM;
>  		goto err_rel_gpio;
>  	}
>  

   Hm, deserves its own patch. And even for this one, you should've documented it
in the patch secription...

> @@ -976,12 +984,11 @@ static int ep93xx_pata_probe(struct platform_device *pdev)
>  	 * so this driver supports only UDMA modes.
>  	 */
>  	if (drv_data->dma_rx_channel && drv_data->dma_tx_channel) {
> -		int chip_rev = ep93xx_chip_revision();
> +		const struct soc_device_attribute *match;
>  
> -		if (chip_rev == EP93XX_CHIP_REV_E1)
> -			ap->udma_mask = ATA_UDMA3;
> -		else if (chip_rev == EP93XX_CHIP_REV_E2)
> -			ap->udma_mask = ATA_UDMA4;
> +		match = soc_device_match(ep93xx_soc_table);
> +		if (match)
> +			ap->udma_mask = (unsigned int) match->data;
>  		else
>  			ap->udma_mask = ATA_UDMA2;
>  	}

   This one also looks as it could have been done separately -- before the DT
conversion?

[...]

MBR, Sergey