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From:   "Rafael J. Wysocki" <rafael@kernel.org>
Date:   Fri, 28 Jul 2023 17:31:08 +0200
Message-ID: <CAJZ5v0ii8AR9fXQJo_DXd60yFrui4Wiw=9C6xPqrKPie8rBSVQ@mail.gmail.com>
Subject: Re: [PATCH v3] ACPI: scan: Create platform device for CS35L56
To:     Richard Fitzgerald <rf@opensource.cirrus.com>
Cc:     rafael@kernel.org, hdegoede@redhat.com, linux-acpi@vger.kernel.org,
        linux-kernel@vger.kernel.org, platform-driver-x86@vger.kernel.org,
        patches@opensource.cirrus.com,
        Simon Trimmer <simont@opensource.cirrus.com>
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On Fri, Jul 28, 2023 at 1:13 PM Richard Fitzgerald
<rf@opensource.cirrus.com> wrote:
>
> From: Simon Trimmer <simont@opensource.cirrus.com>
>
> The ACPI device CSC3556 is a Cirrus Logic CS35L56 mono amplifier which
> is used in multiples, and can be connected either to I2C or SPI.
>
> There will be multiple instances under the same Device() node. Add it
> to ignore_serial_bus_ids and handle it in the serial-multi-instantiate
> driver.
>
> There can be a 5th I2cSerialBusV2, but this is an alias address and doesn't
> represent a real device. Ignore this by having a dummy 5th entry in the
> serial-multi-instantiate instance list with the name of a non-existent
> driver, on the same pattern as done for bsg2150.
>
> Signed-off-by: Simon Trimmer <simont@opensource.cirrus.com>
> Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>

Still ACKed.

> ---
>  drivers/acpi/scan.c                             |  1 +
>  drivers/platform/x86/serial-multi-instantiate.c | 14 ++++++++++++++
>  2 files changed, 15 insertions(+)
>
> diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
> index 5b145f1aaa1b..87e385542576 100644
> --- a/drivers/acpi/scan.c
> +++ b/drivers/acpi/scan.c
> @@ -1714,6 +1714,7 @@ static bool acpi_device_enumeration_by_parent(struct acpi_device *device)
>                 {"BSG1160", },
>                 {"BSG2150", },
>                 {"CSC3551", },
> +               {"CSC3556", },
>                 {"INT33FE", },
>                 {"INT3515", },
>                 /* Non-conforming _HID for Cirrus Logic already released */
> diff --git a/drivers/platform/x86/serial-multi-instantiate.c b/drivers/platform/x86/serial-multi-instantiate.c
> index 2c2abf69f049..8158e3cf5d6d 100644
> --- a/drivers/platform/x86/serial-multi-instantiate.c
> +++ b/drivers/platform/x86/serial-multi-instantiate.c
> @@ -329,6 +329,19 @@ static const struct smi_node cs35l41_hda = {
>         .bus_type = SMI_AUTO_DETECT,
>  };
>
> +static const struct smi_node cs35l56_hda = {
> +       .instances = {
> +               { "cs35l56-hda", IRQ_RESOURCE_AUTO, 0 },
> +               { "cs35l56-hda", IRQ_RESOURCE_AUTO, 0 },
> +               { "cs35l56-hda", IRQ_RESOURCE_AUTO, 0 },
> +               { "cs35l56-hda", IRQ_RESOURCE_AUTO, 0 },
> +               /* a 5th entry is an alias address, not a real device */
> +               { "cs35l56-hda_dummy_dev" },
> +               {}
> +       },
> +       .bus_type = SMI_AUTO_DETECT,
> +};
> +
>  /*
>   * Note new device-ids must also be added to ignore_serial_bus_ids in
>   * drivers/acpi/scan.c: acpi_device_enumeration_by_parent().
> @@ -337,6 +350,7 @@ static const struct acpi_device_id smi_acpi_ids[] = {
>         { "BSG1160", (unsigned long)&bsg1160_data },
>         { "BSG2150", (unsigned long)&bsg2150_data },
>         { "CSC3551", (unsigned long)&cs35l41_hda },
> +       { "CSC3556", (unsigned long)&cs35l56_hda },
>         { "INT3515", (unsigned long)&int3515_data },
>         /* Non-conforming _HID for Cirrus Logic already released */
>         { "CLSA0100", (unsigned long)&cs35l41_hda },
> --
> 2.30.2
>