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Date: Wed, 23 Sep 2015 14:06:59 +0300
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Lee Jones <lee.jones@...aro.org>
Cc: linux-acpi@...r.kernel.org, linux-i2c@...r.kernel.org,
linux-gpio@...r.kernel.org, Wolfram Sang <wsa@...-dreams.de>,
Linus Walleij <linus.walleij@...aro.org>,
"Rafael J. Wysocki" <rjw@...ysocki.net>,
Mika Westerberg <mika.westerberg@...el.com>,
"Puustinen, Ismo" <ismo.puustinen@...el.com>,
"Pandruvada, Srinivas" <srinivas.pandruvada@...el.com>,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 2/8] mfd: core: redo ACPI matching of the children
devices
On Tue, 2015-09-22 at 23:15 +0100, Lee Jones wrote:
> On Tue, 22 Sep 2015, Andy Shevchenko wrote:
>
> > There is at least one board on the market, i.e. Intel Galileo Gen2,
> > that uses
> > _ADR to distinguish the devices under one actual device. Due to
> > this we have to
> > improve the quirk in the MFD core to handle that board.
>
> This will require an ACPI Ack.
Rafael is Cc'ed, so, I hope he will comment on this.
>
> > Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> > ---
> > Documentation/acpi/enumeration.txt | 11 +++++---
> > drivers/mfd/mfd-core.c | 52 ++++++++++++++++++++++++++
> > ------------
> > include/linux/mfd/core.h | 10 ++++++--
> > 3 files changed, 52 insertions(+), 21 deletions(-)
> >
> > diff --git a/Documentation/acpi/enumeration.txt
> > b/Documentation/acpi/enumeration.txt
> > index b731b29..a91ec5a 100644
> > --- a/Documentation/acpi/enumeration.txt
> > +++ b/Documentation/acpi/enumeration.txt
> > @@ -347,13 +347,18 @@ For the first case, the MFD drivers do not
> > need to do anything. The
> > resulting child platform device will have its ACPI_COMPANION() set
> > to point
> > to the parent device.
> >
> > -If the ACPI namespace has a device that we can match using an ACPI
> > id,
> > -the id should be set like:
> > +If the ACPI namespace has a device that we can match using an ACPI
> > id or ACPI
> > +adr, the cell should be set like:
> > +
> > + static struct mfd_cell_acpi_match
> > my_subdevice_cell_acpi_match = {
> > + .pnpid = "XYZ0001",
> > + .adr = 0,
> > + };
> >
> > static struct mfd_cell my_subdevice_cell = {
> > .name = "my_subdevice",
> > /* set the resources relative to the parent */
> > - .acpi_pnpid = "XYZ0001",
> > + .acpi_match = &my_subdevice_cell_acpi_match,
> > };
> >
> > The ACPI id "XYZ0001" is then used to lookup an ACPI device
> > directly under
> > diff --git a/drivers/mfd/mfd-core.c b/drivers/mfd/mfd-core.c
> > index c17635d..60b60dc 100644
> > --- a/drivers/mfd/mfd-core.c
> > +++ b/drivers/mfd/mfd-core.c
> > @@ -82,29 +82,49 @@ static int mfd_platform_add_cell(struct
> > platform_device *pdev,
> > static void mfd_acpi_add_device(const struct mfd_cell *cell,
> > struct platform_device *pdev)
> > {
> > - struct acpi_device *parent_adev;
> > + const struct mfd_cell_acpi_match *match = cell
> > ->acpi_match;
> > + struct acpi_device *parent, *child;
> > struct acpi_device *adev;
> >
> > - parent_adev = ACPI_COMPANION(pdev->dev.parent);
> > - if (!parent_adev)
> > + parent = ACPI_COMPANION(pdev->dev.parent);
> > + if (!parent)
> > return;
> >
> > /*
> > - * MFD child device gets its ACPI handle either from the
> > ACPI
> > - * device directly under the parent that matches the
> > acpi_pnpid or
> > - * it will use the parent handle if is no acpi_pnpid is
> > given.
> > + * MFD child device gets its ACPI handle either from the
> > ACPI device
> > + * directly under the parent that matches the either _HID
> > or _CID, or
> > + * _ADR or it will use the parent handle if is no ID is
> > given.
> > + *
> > + * Note that use of _ADR is a grey area in the ACPI
> > specification,
> > + * though Intel Galileo Gen2 is using it to distinguish
> > the children
> > + * devices.
> > */
> > - adev = parent_adev;
> > - if (cell->acpi_pnpid) {
> > - struct acpi_device_id ids[2] = {};
> > - struct acpi_device *child_adev;
> > -
> > - strlcpy(ids[0].id, cell->acpi_pnpid,
> > sizeof(ids[0].id));
> > - list_for_each_entry(child_adev, &parent_adev
> > ->children, node)
> > - if (acpi_match_device_ids(child_adev,
> > ids)) {
> > - adev = child_adev;
> > - break;
> > + adev = parent;
> > + if (match) {
> > + if (match->pnpid) {
> > + struct acpi_device_id ids[2] = {};
> > +
> > + strlcpy(ids[0].id, match->pnpid,
> > sizeof(ids[0].id));
> > + list_for_each_entry(child, &parent
> > ->children, node) {
> > + if (acpi_match_device_ids(child,
> > ids)) {
> > + adev = child;
> > + break;
> > + }
> > + }
> > + } else {
> > + unsigned long long adr;
> > + acpi_status status;
> > +
> > + list_for_each_entry(child, &parent
> > ->children, node) {
> > + status =
> > acpi_evaluate_integer(child->handle,
> > +
> > "_ADR", NULL,
> > +
> > &adr);
> > + if (ACPI_SUCCESS(status) && match
> > ->adr == adr) {
> > + adev = child;
> > + break;
> > + }
> > }
> > + }
> > }
> >
> > ACPI_COMPANION_SET(&pdev->dev, adev);
> > diff --git a/include/linux/mfd/core.h b/include/linux/mfd/core.h
> > index a76bc10..27dac3f 100644
> > --- a/include/linux/mfd/core.h
> > +++ b/include/linux/mfd/core.h
> > @@ -18,6 +18,12 @@
> >
> > struct irq_domain;
> >
> > +/* Matches ACPI PNP id, either _HID or _CID, or ACPI _ADR */
> > +struct mfd_cell_acpi_match {
> > + const char *pnpid;
> > + const unsigned long long adr;
> > +};
> > +
> > /*
> > * This struct describes the MFD part ("cell").
> > * After registration the copy of this structure will become the
> > platform data
> > @@ -44,8 +50,8 @@ struct mfd_cell {
> > */
> > const char *of_compatible;
> >
> > - /* Matches ACPI PNP id, either _HID or _CID */
> > - const char *acpi_pnpid;
> > + /* Matches ACPI */
> > + const struct mfd_cell_acpi_match *acpi_match;
> >
> > /*
> > * These resources can be specified relative to the parent
> > device.
>
--
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Intel Finland Oy
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