Add acpi support in the common part of pinctrl driver. Parsing
hardware base addresses and irq number to initialize eint
accroding to the acpi table data.
Signed-off-by: Lei Xue <lei.xue@mediatek.com>
---
.../pinctrl/mediatek/pinctrl-mtk-common-v2.c | 24 +++++++++++++++----
drivers/pinctrl/mediatek/pinctrl-paris.c | 6 +++--
2 files changed, 24 insertions(+), 6 deletions(-)
diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
index 4918d38abfc2..afa406afead2 100644
--- a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
+++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
@@ -369,18 +369,30 @@ int mtk_build_eint(struct mtk_pinctrl *hw, struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
int ret, i, j, count_reg_names;
+ struct fwnode_handle *fwnode = dev_fwnode(&pdev->dev);
+ struct resource *res;
if (!IS_ENABLED(CONFIG_EINT_MTK))
return 0;
- if (!of_property_read_bool(np, "interrupt-controller"))
+ if (is_of_node(fwnode) && !of_property_read_bool(np, "interrupt-controller"))
return -ENODEV;
hw->eint = devm_kzalloc(hw->dev, sizeof(*hw->eint), GFP_KERNEL);
if (!hw->eint)
return -ENOMEM;
- count_reg_names = of_property_count_strings(np, "reg-names");
+ if (is_of_node(fwnode)) {
+ count_reg_names = of_property_count_strings(np, "reg-names");
+ } else {
+ count_reg_names = 0;
+ for (i = 0; i < pdev->num_resources; i++) {
+ struct resource *r = &pdev->resource[i];
+
+ if (resource_type(r) == IORESOURCE_MEM)
+ count_reg_names++;
+ }
+ }
if (count_reg_names < 0)
return -EINVAL;
@@ -396,14 +408,18 @@ int mtk_build_eint(struct mtk_pinctrl *hw, struct platform_device *pdev)
}
for (i = hw->soc->nbase_names, j = 0; i < count_reg_names; i++, j++) {
- hw->eint->base[j] = of_iomap(np, i);
+ res = platform_get_resource(pdev, IORESOURCE_MEM, i);
+ hw->eint->base[j] = is_of_node(fwnode) ? of_iomap(np, i) :
+ ioremap(res->start, resource_size(res));
if (IS_ERR(hw->eint->base[j])) {
ret = PTR_ERR(hw->eint->base[j]);
goto err_free_eint;
}
}
- hw->eint->irq = irq_of_parse_and_map(np, 0);
+ hw->eint->irq = is_of_node(fwnode)
+ ? irq_of_parse_and_map(np, 0)
+ : platform_get_irq(pdev, 0);
if (!hw->eint->irq) {
ret = -EINVAL;
goto err_free_eint;
diff --git a/drivers/pinctrl/mediatek/pinctrl-paris.c b/drivers/pinctrl/mediatek/pinctrl-paris.c
index 2cf61cfe809e..9c2751b9b065 100644
--- a/drivers/pinctrl/mediatek/pinctrl-paris.c
+++ b/drivers/pinctrl/mediatek/pinctrl-paris.c
@@ -1008,6 +1008,7 @@ int mtk_paris_pinctrl_probe(struct platform_device *pdev)
struct device *dev = &pdev->dev;
struct pinctrl_pin_desc *pins;
struct mtk_pinctrl *hw;
+ struct fwnode_handle *fwnode = dev_fwnode(&pdev->dev);
int err, i;
hw = devm_kzalloc(&pdev->dev, sizeof(*hw), GFP_KERNEL);
@@ -1032,8 +1033,9 @@ int mtk_paris_pinctrl_probe(struct platform_device *pdev)
return -ENOMEM;
for (i = 0; i < hw->soc->nbase_names; i++) {
- hw->base[i] = devm_platform_ioremap_resource_byname(pdev,
- hw->soc->base_names[i]);
+ hw->base[i] = is_of_node(fwnode)
+ ? devm_platform_ioremap_resource_byname(pdev, hw->soc->base_names[i])
+ : devm_platform_get_and_ioremap_resource(pdev, i, NULL);
if (IS_ERR(hw->base[i]))
return PTR_ERR(hw->base[i]);
}
--
2.45.2On Tue, Nov 25, 2025 at 3:36 AM Lei Xue <lei.xue@mediatek.com> wrote: > Add acpi support in the common part of pinctrl driver. Parsing > hardware base addresses and irq number to initialize eint > accroding to the acpi table data. > > Signed-off-by: Lei Xue <lei.xue@mediatek.com> I'd ideally like Andy and the ARM64 ACPI maintainers look on this. (Added to To:) and CC linux-acpi@vger.kernel.org. I'm not aware of the best way to deal with ACPI in combined drivers but things like this: > - hw->base[i] = devm_platform_ioremap_resource_byname(pdev, > - hw->soc->base_names[i]); > + hw->base[i] = is_of_node(fwnode) > + ? devm_platform_ioremap_resource_byname(pdev, hw->soc->base_names[i]) > + : devm_platform_get_and_ioremap_resource(pdev, i, NULL); Just look really quirky, I think there are better ways to go about this and sometimes the ACPI maintainers give some good pushback about the firmware as well. Yours, Linus Walleij
[+cc: RobH for his information] On Wed, Nov 26, 2025 at 10:10:15AM +0100, Linus Walleij wrote: > On Tue, Nov 25, 2025 at 3:36 AM Lei Xue <lei.xue@mediatek.com> wrote: > > > Add acpi support in the common part of pinctrl driver. Parsing > > hardware base addresses and irq number to initialize eint > > accroding to the acpi table data. > > > > Signed-off-by: Lei Xue <lei.xue@mediatek.com> > > I'd ideally like Andy and the ARM64 ACPI maintainers look on > this. (Added to To:) and CC linux-acpi@vger.kernel.org. > > I'm not aware of the best way to deal with ACPI in combined drivers > but things like this: > > > - hw->base[i] = devm_platform_ioremap_resource_byname(pdev, > > - hw->soc->base_names[i]); > > + hw->base[i] = is_of_node(fwnode) > > + ? devm_platform_ioremap_resource_byname(pdev, hw->soc->base_names[i]) > > + : devm_platform_get_and_ioremap_resource(pdev, i, NULL); > > Just look really quirky, I think there are better ways to go about > this and sometimes the ACPI maintainers give some good > pushback about the firmware as well. How are pdev->resource initialized ? For OF I suppose the names come from "reg-names" (that don't exist in ACPI, yet), for ACPI I assume they come from a _CRS (and you can't tag them by name for the reason above) ? I assume that in ACPI the _CRS resource order is foolproof against the variaty of SOCs this code has to deal with. I also assume/hope that we don't want to add a "reg-names" _DSD property either in ACPI to deal with this seamlessly in DT/ACPI (that was done for "interrupt-names"): https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/firmware-guide/acpi/enumeration.rst?h=v6.18-rc7#n188 I am sorry I have got more questions than answers here - it would be good to understand where the line is drawn when it comes to OF/ACPI and fwnode heuristics compatibility. Thanks, Lorenzo
On Wed, Nov 26, 2025 at 05:52:59PM +0100, Lorenzo Pieralisi wrote: > On Wed, Nov 26, 2025 at 10:10:15AM +0100, Linus Walleij wrote: > > On Tue, Nov 25, 2025 at 3:36 AM Lei Xue <lei.xue@mediatek.com> wrote: > > > > > Add acpi support in the common part of pinctrl driver. Parsing ACPI > > > hardware base addresses and irq number to initialize eint IRQ > > > accroding to the acpi table data. ACPI > > > Signed-off-by: Lei Xue <lei.xue@mediatek.com> > > > > I'd ideally like Andy and the ARM64 ACPI maintainers look on > > this. (Added to To:) and CC linux-acpi@vger.kernel.org. > > > > I'm not aware of the best way to deal with ACPI in combined drivers > > but things like this: > > > > > - hw->base[i] = devm_platform_ioremap_resource_byname(pdev, > > > - hw->soc->base_names[i]); > > > + hw->base[i] = is_of_node(fwnode) > > > + ? devm_platform_ioremap_resource_byname(pdev, hw->soc->base_names[i]) > > > + : devm_platform_get_and_ioremap_resource(pdev, i, NULL); > > > > Just look really quirky, I think there are better ways to go about > > this and sometimes the ACPI maintainers give some good > > pushback about the firmware as well. Agree. It looks fragile. I believe the best approach is to have fwnode_iomap_byname() and if required add a quirk to have a software node with names. > How are pdev->resource initialized ? For OF I suppose the names come from > "reg-names" (that don't exist in ACPI, yet), for ACPI I assume they come > from a _CRS (and you can't tag them by name for the reason above) ? We always can hardcode the names if required in quirks via software nodes. GPIO has even special data types for that (struct acpi_gpio_mapping). > I assume that in ACPI the _CRS resource order is foolproof against the > variaty of SOCs this code has to deal with. Yeah, that's what we have with GPIOs in a few drivers, the hardcoded quirks. > I also assume/hope that we don't want to add a "reg-names" _DSD property either > in ACPI to deal with this seamlessly in DT/ACPI (that was done for > "interrupt-names"): > > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/firmware-guide/acpi/enumeration.rst?h=v6.18-rc7#n188 Hmm... Why not? > I am sorry I have got more questions than answers here - it would be good > to understand where the line is drawn when it comes to OF/ACPI and fwnode > heuristics compatibility. -- With Best Regards, Andy Shevchenko
On Wed, Nov 26, 2025 at 08:06:51PM +0200, Andy Shevchenko wrote: [...] > > I also assume/hope that we don't want to add a "reg-names" _DSD property either > > in ACPI to deal with this seamlessly in DT/ACPI (that was done for > > "interrupt-names"): > > > > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/firmware-guide/acpi/enumeration.rst?h=v6.18-rc7#n188 > > Hmm... Why not? What's the policy there ? Half of the ACPI bindings for an interrupt descriptor are defined in the ACPI specs (ie _CRS) and the other half (ie "interrupt-names") is documented in the Linux kernel (or are we documenting this elsewhere ?) ? Or we are saying that "interrupt-names" properties are added by kernel code _only_ (through software nodes, to make parsing seamless between DT and ACPI) based on hardcoded name values in drivers ? I don't think I can grok any example of the latter in the mainline. I am asking because I'd need to add something similar shortly to make parsing of platform devices created out of ACPI static tables easier (I guess we can postpone discussion till I post the code but I thought I'd ask). Are we going to do the same for "reg-names" ? Most importantly, what is DT maintainers stance on the matter ? Thanks, Lorenzo > > I am sorry I have got more questions than answers here - it would be good > > to understand where the line is drawn when it comes to OF/ACPI and fwnode > > heuristics compatibility. > > -- > With Best Regards, > Andy Shevchenko > >
On Thu, Nov 27, 2025 at 11:06:29AM +0100, Lorenzo Pieralisi wrote: > On Wed, Nov 26, 2025 at 08:06:51PM +0200, Andy Shevchenko wrote: [...] > > > I also assume/hope that we don't want to add a "reg-names" _DSD property either > > > in ACPI to deal with this seamlessly in DT/ACPI (that was done for > > > "interrupt-names"): > > > > > > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/firmware-guide/acpi/enumeration.rst?h=v6.18-rc7#n188 > > > > Hmm... Why not? > > What's the policy there ? > Half of the ACPI bindings for an interrupt > descriptor are defined in the ACPI specs (ie _CRS) and the other half > (ie "interrupt-names") is documented in the Linux kernel (or are we > documenting this elsewhere ?) ? Yeah, nobody pursued ACPI specification updates / addendum to make it fully official. _De facto_ we have established practice for GPIOs enumeration (as most used resources in the OSes), Linux official for PWM, I²C muxes, multi-functional HW (such as Diolan DLN-2, LJCA), Microsoft defined for so called "USB hardwired" devices, Linux defined for LEDs and GPIO keys, sensor mount matrix as per "most used" cases + DT analogue works just because we have agnostic APIs in IIO to retrieve that. There are maybe more, but don't remember So, I think the practical "policies" are that: - if it's defined in ACPI spec, we use the spec - if there is Microsoft addendum, we rely on what Windows does - WMI, EFI, and other "windoze"-like vendor defined cases - if it makes sense, we establish practice from Linux perspective - the rest, every vendor does what it does That said, for the first two we expect OEMs to follow, for the third one depends, but there are established WMI calls and other more or less "standard" interfaces, so like the first two. For the fourth one (Linux) we do, but living in the expectation that some or more vendors fall to the fifth category and we might need to support that if we want their HW work in Linux. > Or we are saying that "interrupt-names" properties are added by kernel > code _only_ (through software nodes, to make parsing seamless between DT > and ACPI) based on hardcoded name values in drivers ? No, the idea behind software nodes is to "fix" the FW nodes in case the FW description can not be modified (and that might well happen to even DT in some cases AFAIH). So, if some driver hard codes "interrupt-names" we expect that new versions of the FW that support the HW that needs the property will be amended accordingly. "interrupt-names" has been established for ACPI to support a separate SMB alert interrupt. However, I haven't heard any development of that IRL (for real devices in ACPI environment). > I don't think I can grok any example of the latter in the mainline. > > I am asking because I'd need to add something similar shortly to make parsing > of platform devices created out of ACPI static tables easier (I guess we > can postpone discussion till I post the code but I thought I'd ask). Oh, I can go ahead and tell you, try to avoid that. Why?! Whatever, indeed, please Cc me to that, I will be glad to study the case and try to be helpful. (Have you considered DT overlays instead? There is a big pending support for that for _ACPI_ platforms.) > Are we going to do the same for "reg-names" ? If it makes sense and we expect some vendor to follow that _in ACPI_, why not? > Most importantly, what is DT maintainers stance on the matter ? AFAIK They don't care as long as there is a schema provided, accepted and used in DT, if it's ACPI-only thing, then it most likely should be done in ACPI-like way (see above the first two / three items: spec, MS, WMI/EFI). > > > I am sorry I have got more questions than answers here - it would be good > > > to understand where the line is drawn when it comes to OF/ACPI and fwnode > > > heuristics compatibility. -- With Best Regards, Andy Shevchenko
On Thu, Nov 27, 2025 at 04:29:54PM +0200, Andy Shevchenko wrote: > On Thu, Nov 27, 2025 at 11:06:29AM +0100, Lorenzo Pieralisi wrote: > > On Wed, Nov 26, 2025 at 08:06:51PM +0200, Andy Shevchenko wrote: > > [...] > > > > > I also assume/hope that we don't want to add a "reg-names" _DSD property either > > > > in ACPI to deal with this seamlessly in DT/ACPI (that was done for > > > > "interrupt-names"): > > > > > > > > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/firmware-guide/acpi/enumeration.rst?h=v6.18-rc7#n188 > > > > > > Hmm... Why not? > > > > What's the policy there ? > > > Half of the ACPI bindings for an interrupt > > descriptor are defined in the ACPI specs (ie _CRS) and the other half > > (ie "interrupt-names") is documented in the Linux kernel (or are we > > documenting this elsewhere ?) ? > > Yeah, nobody pursued ACPI specification updates / addendum to make it fully > official. _De facto_ we have established practice for GPIOs enumeration > (as most used resources in the OSes), Linux official for PWM, I²C muxes, > multi-functional HW (such as Diolan DLN-2, LJCA), Microsoft defined for > so called "USB hardwired" devices, Linux defined for LEDs and GPIO keys, > sensor mount matrix as per "most used" cases + DT analogue works just > because we have agnostic APIs in IIO to retrieve that. There are maybe > more, but don't remember > > So, I think the practical "policies" are that: > - if it's defined in ACPI spec, we use the spec > - if there is Microsoft addendum, we rely on what Windows does > - WMI, EFI, and other "windoze"-like vendor defined cases > - if it makes sense, we establish practice from Linux perspective > - the rest, every vendor does what it does > > That said, for the first two we expect OEMs to follow, for the third one > depends, but there are established WMI calls and other more or less "standard" > interfaces, so like the first two. > > For the fourth one (Linux) we do, but living in the expectation that some or > more vendors fall to the fifth category and we might need to support that if > we want their HW work in Linux. > > > Or we are saying that "interrupt-names" properties are added by kernel > > code _only_ (through software nodes, to make parsing seamless between DT > > and ACPI) based on hardcoded name values in drivers ? > > No, the idea behind software nodes is to "fix" the FW nodes in case the FW > description can not be modified (and that might well happen to even DT in some > cases AFAIH). So, if some driver hard codes "interrupt-names" we expect that > new versions of the FW that support the HW that needs the property will be > amended accordingly. > > "interrupt-names" has been established for ACPI to support a separate SMB alert > interrupt. However, I haven't heard any development of that IRL (for real > devices in ACPI environment). > > > I don't think I can grok any example of the latter in the mainline. > > > > I am asking because I'd need to add something similar shortly to make parsing > > of platform devices created out of ACPI static tables easier (I guess we > > can postpone discussion till I post the code but I thought I'd ask). > > Oh, I can go ahead and tell you, try to avoid that. Why?! Whatever, > indeed, please Cc me to that, I will be glad to study the case and > try to be helpful. > > (Have you considered DT overlays instead? There is a big pending support for > that for _ACPI_ platforms.) Long story short: we do need to create platform devices out of static table (eg ARM64 IORT) entries. Current code parses the table entries and try to map the devices IRQs (ie acpi_register_gsi()) when the platform device is created. Now, the interrupt controller that device IRQ's is routed to might not have probed yet. We have to defer probing and later, when the platform driver probes, map the IRQ. Issue is: for OF nodes and ACPI devices, behind the platform device firmware node there is a standard firmware object, so implementing fwnode_irq_get() is trivial. For the devices I am talking about, the data providing GSI info (hwirq, trigger/polarity) is static table specific, so the idea was to stash that data and embed it in fwnode_static along with a irq_get() fwnode_operations function specific to that piece of data so that device drivers can actually do: fwnode_irq_get() on the fwnode _seamlessly_ (if you still do wonder: those platform devices created out of static table entries in ACPI in OF are of_node(s)). There is a less convoluted solution (that is what some platform drivers in ACPI do today), that is, we pass the static table data in pdev->dev.platform_data and each platform_driver parses it differently. That works but that also means the in the respective device drivers OF and ACPI IRQ (and MMIO) parsing differ (which is not necessarily a problem I just have to rewrite them all). Now - when it comes to "interrupt-names". Some of the device drivers I mention do: eg platform_get_irq_byname_optional() that expects the IRQ to be mapped and stored in a named platform device resource. That's easy in DT - for two reasons: (1) "interrupt-names" (2) standard properties behind the of_node how to do that for fwnodes that aren't backed by either OF nodes or ACPI devices (that do use "interrupt-names" _DSD property) is a question. Mind, the "interrupt-names" thing is a detail in the whole mechanism. DT overlays to represent in ACPI those static table entries ? I vividly remember the days ACPI for ARM64 was being merged - that's what our crystal ball predicted :) This delayed IRQ mapping notwithstanding, I read what you wrote and took note. The worry is, this fwnode_*() (on ACPI nodes) interface trickling into subsystems where it should not (ie PCI, clocks, regulators) - hopefully the respective maintainers are keeping an eye on it. Thanks, Lorenzo > > Are we going to do the same for "reg-names" ? > > If it makes sense and we expect some vendor to follow that _in ACPI_, > why not? > > > Most importantly, what is DT maintainers stance on the matter ? > > AFAIK They don't care as long as there is a schema provided, accepted and > used in DT, if it's ACPI-only thing, then it most likely should be done > in ACPI-like way (see above the first two / three items: spec, MS, WMI/EFI). > > > > > I am sorry I have got more questions than answers here - it would be good > > > > to understand where the line is drawn when it comes to OF/ACPI and fwnode > > > > heuristics compatibility. > > -- > With Best Regards, > Andy Shevchenko > >
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