linux-kernel - Re: [PATCH v8 09/23] ata: libahci_platform: Parse ports-implemented property in resources getter

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Date:   Mon, 19 Sep 2022 14:50:14 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Serge Semin <Sergey.Semin@...kalelectronics.ru>
Cc:     Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Jens Axboe <axboe@...nel.dk>, Hannes Reinecke <hare@...e.de>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Patrice Chotard <patrice.chotard@...s.st.com>,
        Serge Semin <fancer.lancer@...il.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v8 09/23] ata: libahci_platform: Parse ports-implemented
 property in resources getter

On Fri, Sep 09, 2022 at 10:36:07PM +0300, Serge Semin wrote:
> The ports-implemented property is mainly used on the OF-based platforms
> with no ports mapping initialized by a bootloader/BIOS firmware. Seeing
> the same of_property_read_u32()-based pattern has already been implemented
> in the generic AHCI LLDD (glue) driver and in the Mediatek, St AHCI
> drivers let's move the property read procedure to the generic
> ahci_platform_get_resources() method. Thus we'll have the forced ports
> mapping feature supported for each OF-based platform which requires that,
> and stop re-implementing the same pattern in there a bit simplifying the
> code.
> 
> Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
> ---
>  drivers/ata/ahci_mtk.c         | 2 --
>  drivers/ata/ahci_platform.c    | 3 ---
>  drivers/ata/ahci_st.c          | 3 ---
>  drivers/ata/libahci_platform.c | 3 +++
>  4 files changed, 3 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/ata/ahci_mtk.c b/drivers/ata/ahci_mtk.c
> index 1f6c85fde983..c056378e3e72 100644
> --- a/drivers/ata/ahci_mtk.c
> +++ b/drivers/ata/ahci_mtk.c
> @@ -118,8 +118,6 @@ static int mtk_ahci_parse_property(struct ahci_host_priv *hpriv,
>  				   SYS_CFG_SATA_EN);
>  	}
>  
> -	of_property_read_u32(np, "ports-implemented", &hpriv->force_port_map);
> -
>  	return 0;
>  }
>  
> diff --git a/drivers/ata/ahci_platform.c b/drivers/ata/ahci_platform.c
> index 28a8de5b48b9..9b56490ecbc3 100644
> --- a/drivers/ata/ahci_platform.c
> +++ b/drivers/ata/ahci_platform.c
> @@ -56,9 +56,6 @@ static int ahci_probe(struct platform_device *pdev)
>  	if (rc)
>  		return rc;
>  
> -	of_property_read_u32(dev->of_node,
> -			     "ports-implemented", &hpriv->force_port_map);
> -
>  	if (of_device_is_compatible(dev->of_node, "hisilicon,hisi-ahci"))
>  		hpriv->flags |= AHCI_HFLAG_NO_FBS | AHCI_HFLAG_NO_NCQ;
>  
> diff --git a/drivers/ata/ahci_st.c b/drivers/ata/ahci_st.c
> index 7526653c843b..068621099c00 100644
> --- a/drivers/ata/ahci_st.c
> +++ b/drivers/ata/ahci_st.c
> @@ -168,9 +168,6 @@ static int st_ahci_probe(struct platform_device *pdev)
>  
>  	st_ahci_configure_oob(hpriv->mmio);
>  
> -	of_property_read_u32(dev->of_node,
> -			     "ports-implemented", &hpriv->force_port_map);
> -

With arm:allmodconfig, this results in:

  CC [M]  drivers/ata/ahci_st.o
drivers/ata/ahci_st.c: In function 'st_ahci_probe':
drivers/ata/ahci_st.c:147:24: error: unused variable 'dev' [-Werror=unused-variable]
  147 |         struct device *dev = &pdev->dev;

Guenter