G'day Sebastian,
On 21/11/2017 21:34, Sebastian Reichel wrote:
Hi,
On Tue, Nov 21, 2017 at 04:21:30PM +0800, Phil Reid wrote:
The irq polarity is already encoded in the irq config. Use that to
determine the polarity for the mcp32s08 irq output instead of the
custom microchip,irq-active-high property.
Signed-off-by: Phil Reid <preid@xxxxxxxxxxxxxxxxx>
---
I don't like, that we use the flags for configuring the host
interrupt input and the mcp23xxx interrupt output. Usually
when the interrupt line has an inverter on it, board DTS files
just toggle the interrupts polarity. This will not work with
this patch applied. We would need to explicitly add an inverter
in the interrupt line, which is completely different to how its
implemented everywhere else (I know at least some Tegra devices
have implicit inverters on interrupt lines).
In case this is really wanted, this patch and the first patch
should be merged to avoid temporarily exposing the splitted
logic.
Thanks for looking at the series.
Yes I understand where your coming from. And that's exactly what I
was trying to do in v2. I have 2 of these devices with open drain output
that is feed to an inverter. So active low output from devices and irq
consumer is active high input.
However Linux wasn't a fan of the property and wanted it gone.
He suggested we need a "inverter" device to allow for that in the
device tree. I haven't got my head around how to do that thou.
And if someone is relying on that implicit behaviour are we allowed
to break things? Probably ok with this one as it's currently not possible
due to code patch 1 removes.
If we need to model the invert to get the patches accepted I look into that.
I don't actually need it for my system as I can set open-drain with overrides
the active-high control on this device, while have active high irq consumer.
:)
drivers/pinctrl/pinctrl-mcp23s08.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)
diff --git a/drivers/pinctrl/pinctrl-mcp23s08.c b/drivers/pinctrl/pinctrl-mcp23s08.c
index 8ff9b77..6b3f810 100644
--- a/drivers/pinctrl/pinctrl-mcp23s08.c
+++ b/drivers/pinctrl/pinctrl-mcp23s08.c
@@ -773,6 +773,7 @@ static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev,
bool mirror = false;
bool irq_active_high = false;
bool open_drain = false;
+ u32 irq_trig;
mutex_init(&mcp->lock);
@@ -863,9 +864,13 @@ static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev,
mcp->irq_controller =
device_property_read_bool(dev, "interrupt-controller");
if (mcp->irq && mcp->irq_controller) {
- irq_active_high =
- device_property_read_bool(dev,
- "microchip,irq-active-high");
+ if (device_property_present(dev, "microchip,irq-active-high"))
+ dev_warn(dev,
+ "microchip,irq-active-high is deprecated\n");
+
+ irq_trig = irqd_get_trigger_type(irq_get_irq_data(mcp->irq));
+ if (irq_trig == IRQF_TRIGGER_HIGH)
+ irq_active_high = true;
mirror = device_property_read_bool(dev, "microchip,irq-mirror");
open_drain = device_property_read_bool(dev, "drive-open-drain");
--
1.8.3.1
--
Regards
Phil Reid
ElectroMagnetic Imaging Technology Pty Ltd
Development of Geophysical Instrumentation & Software
www.electromag.com.au
3 The Avenue, Midland WA 6056, AUSTRALIA
Ph: +61 8 9250 8100
Fax: +61 8 9250 7100
Email: preid@xxxxxxxxxxxxxxxxx
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