linux-kernel - Re: [PATCH v2 3/3] acpi spi: Initialize modalias from of

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Message-ID: <CAJZ5v0jPfx0DEKkfJ8ma2_+emtbSrCv3KrmRGP7gG-6j6h3yfw@mail.gmail.com>
Date:	Wed, 13 Jul 2016 14:22:02 +0200
From:	"Rafael J. Wysocki" <rafael@...nel.org>
To:	Crestez Dan Leonard <leonard.crestez@...el.com>
Cc:	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Jarkko Nikula <jarkko.nikula@...el.com>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Len Brown <lenb@...nel.org>,
	linux-i2c <linux-i2c@...r.kernel.org>,
	Wolfram Sang <wsa@...-dreams.de>,
	linux-spi <linux-spi@...r.kernel.org>,
	Mark Brown <broonie@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Octavian Purdila <octavian.purdila@...el.com>
Subject: Re: [PATCH v2 3/3] acpi spi: Initialize modalias from of_compatible

On Wed, Jul 13, 2016 at 1:53 PM, Crestez Dan Leonard
<leonard.crestez@...el.com> wrote:
> When using devicetree spi_device.modalias is set to the compatible
> string with the vendor prefix removed. For SPI devices described via
> ACPI the i2c_board_info.type string is initialized by acpi_device_hid.
> When using ACPI and DT ids this string ends up something like "PRP0001".
>
> Change acpi_register_spi_device to use the of_compatible property if
> present. This makes it easier to instantiate spi drivers through ACPI
> with DT ids.
>
> Signed-off-by: Crestez Dan Leonard <leonard.crestez@...el.com>

Same as for the i2c patch: it looks good to me, but I'd prefer to get
a word from Mika on it too.

> ---
>  drivers/spi/spi.c | 11 ++++++++++-
>  1 file changed, 10 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
> index 7589c8a..49fdf6e 100644
> --- a/drivers/spi/spi.c
> +++ b/drivers/spi/spi.c
> @@ -1679,13 +1679,22 @@ static acpi_status acpi_register_spi_device(struct spi_master *master,
>                 return AE_OK;
>         }
>
> +       if (adev->data.of_compatible) {
> +               ret = acpi_of_modalias(adev, spi->modalias, sizeof(spi->modalias));
> +               if (ret) {
> +                       spi_dev_put(spi);
> +                       return AE_NOT_FOUND;
> +               }
> +       } else {
> +               strlcpy(spi->modalias, acpi_device_hid(adev), sizeof(spi->modalias));
> +       }
> +
>         if (spi->irq < 0)
>                 spi->irq = acpi_dev_gpio_irq_get(adev, 0);
>
>         acpi_device_set_enumerated(adev);
>
>         adev->power.flags.ignore_parent = true;
> -       strlcpy(spi->modalias, acpi_device_hid(adev), sizeof(spi->modalias));
>         if (spi_add_device(spi)) {
>                 adev->power.flags.ignore_parent = false;
>                 dev_err(&master->dev, "failed to add SPI device %s from ACPI\n",
> --

Thanks,
Rafael