* [RFC PATCH 1/3] dt-bindings: gpio-rcar: Add optional use-alternative-interrupt property
2020-04-22 10:10 [RFC PATCH 0/3] gpio: rcar: Add support for GPIO alternative interrupt Eugeniu Rosca
@ 2020-04-22 10:10 ` Eugeniu Rosca
2020-04-24 8:06 ` Geert Uytterhoeven
2020-04-22 10:10 ` [RFC PATCH 2/3] gpio: rcar: Add support for GPIO alternative interrupt Eugeniu Rosca
2020-04-22 10:10 ` [RFC PATCH 3/3] [LOCAL] arm64: dts: renesas: ulcb: Showcase 'use-alternative-interrupt' Eugeniu Rosca
2 siblings, 1 reply; 6+ messages in thread
From: Eugeniu Rosca @ 2020-04-22 10:10 UTC (permalink / raw)
To: linux-renesas-soc, linux-gpio, linux-kernel
Cc: Geert Uytterhoeven, Linus Walleij, Marek Vasut, Wolfram Sang,
Sergei Shtylyov, Bartosz Golaszewski, Yoshihiro Shimoda,
Biju Das, Grygorii Strashko, Chris Paterson, Yusuke Ashiduka,
Torii Kenichi, Fukui Yohhei, Yasushi Asano, Yuichi Kusakabe,
Andrew Gabbasov, Jiada Wang, Eugeniu Rosca, Eugeniu Rosca
From: Torii Kenichi <torii.ken1@jp.fujitsu.com>
When setting this property, you must set alternate interrupt number in
the 'interrupts' property.
Signed-off-by: Torii Kenichi <torii.ken1@jp.fujitsu.com>
[erosca: tidy up the descriptions/comments]
Signed-off-by: Eugeniu Rosca <erosca@de.adit-jv.com>
---
Documentation/devicetree/bindings/gpio/renesas,gpio-rcar.txt | 3 +++
1 file changed, 3 insertions(+)
diff --git a/Documentation/devicetree/bindings/gpio/renesas,gpio-rcar.txt b/Documentation/devicetree/bindings/gpio/renesas,gpio-rcar.txt
index 10dce84b1545..aa5aea90431a 100644
--- a/Documentation/devicetree/bindings/gpio/renesas,gpio-rcar.txt
+++ b/Documentation/devicetree/bindings/gpio/renesas,gpio-rcar.txt
@@ -50,6 +50,9 @@ Optional properties:
- clocks: Must contain a reference to the functional clock. The property is
mandatory if the hardware implements a controllable functional clock for
the GPIO instance.
+ - use-alternative-interrupt: Use 'alternative' GPIO interrupt instead
+ of 'normal' GPIO interrupt. When you specify this property, you must
+ also change the 'interrupts' DT property.
- gpio-reserved-ranges: See gpio.txt.
--
2.26.0
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [RFC PATCH 2/3] gpio: rcar: Add support for GPIO alternative interrupt
2020-04-22 10:10 [RFC PATCH 0/3] gpio: rcar: Add support for GPIO alternative interrupt Eugeniu Rosca
2020-04-22 10:10 ` [RFC PATCH 1/3] dt-bindings: gpio-rcar: Add optional use-alternative-interrupt property Eugeniu Rosca
@ 2020-04-22 10:10 ` Eugeniu Rosca
2020-04-24 8:36 ` Geert Uytterhoeven
2020-04-22 10:10 ` [RFC PATCH 3/3] [LOCAL] arm64: dts: renesas: ulcb: Showcase 'use-alternative-interrupt' Eugeniu Rosca
2 siblings, 1 reply; 6+ messages in thread
From: Eugeniu Rosca @ 2020-04-22 10:10 UTC (permalink / raw)
To: linux-renesas-soc, linux-gpio, linux-kernel
Cc: Geert Uytterhoeven, Linus Walleij, Marek Vasut, Wolfram Sang,
Sergei Shtylyov, Bartosz Golaszewski, Yoshihiro Shimoda,
Biju Das, Grygorii Strashko, Chris Paterson, Yusuke Ashiduka,
Torii Kenichi, Fukui Yohhei, Yasushi Asano, Yuichi Kusakabe,
Andrew Gabbasov, Jiada Wang, Eugeniu Rosca, Eugeniu Rosca
From: Torii Kenichi <torii.ken1@jp.fujitsu.com>
INTC-AP accepts both GPIO interrupt and GPIO alternative interrupt,
but INTC-RT can only handle GPIO interrupt, as depicted in below excerpt
from 'Figure 7.1 GPIO Block Configuration (1)' of
'R-Car3 HW User's Manual Rev.2.00, Jul 2019':
+------------------------------+
| Interrupt display register +----> GPIO.ch* (to INTC-AP, INTC-RT)
| (INTDTn) +----> GPIO.ch*A (to INTC-AP)
+------------------------------+
It seems to be also the case for earlier Renesas SoCs like RZ/G,
as per 'Figure 6.1 GPIO Block Configuration' in
'RZ/G Series User’s Manual: Hardware Rev.1.00 Sep 2016' [1].
To reduce the interference between RT domain (CR7/SH) and the AP domain
(Cortex A5x) and to independently control GPIO interrupts in these two
domains, add support for processing GPIO alternative interrupts in AP.
This allows handling normal GPIO interrupts exclusively by INTC-RT.
The change is DT-driven and depends on the enablement of the
'use-alternative-interrupt' DTS property.
One caveat is that the 'interrupts' property update must go hand in hand
with the newly added 'use-alternative-interrupt' property.
[1] https://www.renesas.com/eu/en/products/microcontrollers-microprocessors/rz/rzg/rzg1m.html#documents
Signed-off-by: Torii Kenichi <torii.ken1@jp.fujitsu.com>
[erosca: enrich commit description]
Signed-off-by: Eugeniu Rosca <erosca@de.adit-jv.com>
---
drivers/gpio/gpio-rcar.c | 22 +++++++++++++++++-----
1 file changed, 17 insertions(+), 5 deletions(-)
diff --git a/drivers/gpio/gpio-rcar.c b/drivers/gpio/gpio-rcar.c
index 7284473c9fe3..6bbab447bba8 100644
--- a/drivers/gpio/gpio-rcar.c
+++ b/drivers/gpio/gpio-rcar.c
@@ -43,6 +43,8 @@ struct gpio_rcar_priv {
bool has_outdtsel;
bool has_both_edge_trigger;
struct gpio_rcar_bank_info bank_info;
+ int intmsk;
+ int mskclr;
};
#define IOINTSEL 0x00 /* General IO/Interrupt Switching Register */
@@ -56,6 +58,8 @@ struct gpio_rcar_priv {
#define POSNEG 0x20 /* Positive/Negative Logic Select Register */
#define EDGLEVEL 0x24 /* Edge/level Select Register */
#define FILONOFF 0x28 /* Chattering Prevention On/Off Register */
+#define INTMSKS 0x38 /* Interrupt Sub Mask Register */
+#define MSKCLRS 0x3c /* Interrupt Sub Mask Clear Register */
#define OUTDTSEL 0x40 /* Output Data Select Register */
#define BOTHEDGE 0x4c /* One Edge/Both Edge Select Register */
@@ -90,7 +94,7 @@ static void gpio_rcar_irq_disable(struct irq_data *d)
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct gpio_rcar_priv *p = gpiochip_get_data(gc);
- gpio_rcar_write(p, INTMSK, ~BIT(irqd_to_hwirq(d)));
+ gpio_rcar_write(p, p->intmsk, ~BIT(irqd_to_hwirq(d)));
}
static void gpio_rcar_irq_enable(struct irq_data *d)
@@ -98,7 +102,7 @@ static void gpio_rcar_irq_enable(struct irq_data *d)
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct gpio_rcar_priv *p = gpiochip_get_data(gc);
- gpio_rcar_write(p, MSKCLR, BIT(irqd_to_hwirq(d)));
+ gpio_rcar_write(p, p->mskclr, BIT(irqd_to_hwirq(d)));
}
static void gpio_rcar_config_interrupt_input_mode(struct gpio_rcar_priv *p,
@@ -203,7 +207,7 @@ static irqreturn_t gpio_rcar_irq_handler(int irq, void *dev_id)
unsigned int offset, irqs_handled = 0;
while ((pending = gpio_rcar_read(p, INTDT) &
- gpio_rcar_read(p, INTMSK))) {
+ gpio_rcar_read(p, p->intmsk))) {
offset = __ffs(pending);
gpio_rcar_write(p, INTCLR, BIT(offset));
generic_handle_irq(irq_find_mapping(p->gpio_chip.irq.domain,
@@ -427,6 +431,14 @@ static int gpio_rcar_parse_dt(struct gpio_rcar_priv *p, unsigned int *npins)
*npins = RCAR_MAX_GPIO_PER_BANK;
}
+ if (of_get_property(np, "use-alternative-interrupt", NULL)) {
+ p->intmsk = INTMSKS;
+ p->mskclr = MSKCLRS;
+ } else {
+ p->intmsk = INTMSK;
+ p->mskclr = MSKCLR;
+ }
+
return 0;
}
@@ -544,7 +556,7 @@ static int gpio_rcar_suspend(struct device *dev)
p->bank_info.iointsel = gpio_rcar_read(p, IOINTSEL);
p->bank_info.inoutsel = gpio_rcar_read(p, INOUTSEL);
p->bank_info.outdt = gpio_rcar_read(p, OUTDT);
- p->bank_info.intmsk = gpio_rcar_read(p, INTMSK);
+ p->bank_info.intmsk = gpio_rcar_read(p, p->intmsk);
p->bank_info.posneg = gpio_rcar_read(p, POSNEG);
p->bank_info.edglevel = gpio_rcar_read(p, EDGLEVEL);
if (p->has_both_edge_trigger)
@@ -586,7 +598,7 @@ static int gpio_rcar_resume(struct device *dev)
!!(p->bank_info.bothedge & mask));
if (p->bank_info.intmsk & mask)
- gpio_rcar_write(p, MSKCLR, mask);
+ gpio_rcar_write(p, p->mskclr, mask);
}
}
--
2.26.0
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [RFC PATCH 3/3] [LOCAL] arm64: dts: renesas: ulcb: Showcase 'use-alternative-interrupt'
2020-04-22 10:10 [RFC PATCH 0/3] gpio: rcar: Add support for GPIO alternative interrupt Eugeniu Rosca
2020-04-22 10:10 ` [RFC PATCH 1/3] dt-bindings: gpio-rcar: Add optional use-alternative-interrupt property Eugeniu Rosca
2020-04-22 10:10 ` [RFC PATCH 2/3] gpio: rcar: Add support for GPIO alternative interrupt Eugeniu Rosca
@ 2020-04-22 10:10 ` Eugeniu Rosca
2 siblings, 0 replies; 6+ messages in thread
From: Eugeniu Rosca @ 2020-04-22 10:10 UTC (permalink / raw)
To: linux-renesas-soc, linux-gpio, linux-kernel
Cc: Geert Uytterhoeven, Linus Walleij, Marek Vasut, Wolfram Sang,
Sergei Shtylyov, Bartosz Golaszewski, Yoshihiro Shimoda,
Biju Das, Grygorii Strashko, Chris Paterson, Yusuke Ashiduka,
Torii Kenichi, Fukui Yohhei, Yasushi Asano, Yuichi Kusakabe,
Andrew Gabbasov, Jiada Wang, Eugeniu Rosca, Eugeniu Rosca
One caveat is that the 'interrupts' property update _must_ go hand
in hand with the newly added 'use-alternative-interrupt' property.
Is there an easy way to avoid it?
Signed-off-by: Eugeniu Rosca <erosca@de.adit-jv.com>
---
arch/arm64/boot/dts/renesas/ulcb.dtsi | 40 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 40 insertions(+)
diff --git a/arch/arm64/boot/dts/renesas/ulcb.dtsi b/arch/arm64/boot/dts/renesas/ulcb.dtsi
index d2ba9598cd1e..168dadbd1185 100644
--- a/arch/arm64/boot/dts/renesas/ulcb.dtsi
+++ b/arch/arm64/boot/dts/renesas/ulcb.dtsi
@@ -174,6 +174,46 @@ &extalr_clk {
clock-frequency = <32768>;
};
+&gpio0 {
+ use-alternative-interrupt;
+ interrupts = <GIC_SPI 248 IRQ_TYPE_LEVEL_HIGH>;
+};
+
+&gpio1 {
+ use-alternative-interrupt;
+ interrupts = <GIC_SPI 249 IRQ_TYPE_LEVEL_HIGH>;
+};
+
+&gpio2 {
+ use-alternative-interrupt;
+ interrupts = <GIC_SPI 250 IRQ_TYPE_LEVEL_HIGH>;
+};
+
+&gpio3 {
+ use-alternative-interrupt;
+ interrupts = <GIC_SPI 251 IRQ_TYPE_LEVEL_HIGH>;
+};
+
+&gpio4 {
+ use-alternative-interrupt;
+ interrupts = <GIC_SPI 252 IRQ_TYPE_LEVEL_HIGH>;
+};
+
+&gpio5 {
+ use-alternative-interrupt;
+ interrupts = <GIC_SPI 253 IRQ_TYPE_LEVEL_HIGH>;
+};
+
+&gpio6 {
+ use-alternative-interrupt;
+ interrupts = <GIC_SPI 254 IRQ_TYPE_LEVEL_HIGH>;
+};
+
+&gpio7 {
+ use-alternative-interrupt;
+ interrupts = <GIC_SPI 255 IRQ_TYPE_LEVEL_HIGH>;
+};
+
&hdmi0 {
status = "okay";
--
2.26.0
^ permalink raw reply related [flat|nested] 6+ messages in thread