Hi Andrea
On 01/13/2017 04:01 PM, Andrea Merello wrote:
On Tue, Jan 10, 2017 at 10:18 AM, Alexandre Torgue
<alexandre.torgue@xxxxxx> wrote:
Hi Andrea
On 01/10/2017 09:42 AM, Andrea Merello wrote:
Signed-off-by: Andrea Merello <andrea.merello@xxxxxxxxx>
Can you please add a commit message.
Can you also change commit header like: "ARM: dts: stm32: enable SDIO
controller on stm32f469 disco board
---
arch/arm/boot/dts/stm32f429.dtsi | 2 +-
arch/arm/boot/dts/stm32f469-disco.dts | 29 +++++++++++++++++++++++++++++
2 files changed, 30 insertions(+), 1 deletion(-)
diff --git a/arch/arm/boot/dts/stm32f429.dtsi
b/arch/arm/boot/dts/stm32f429.dtsi
index c12a64e..5aba383 100644
--- a/arch/arm/boot/dts/stm32f429.dtsi
+++ b/arch/arm/boot/dts/stm32f429.dtsi
@@ -206,7 +206,7 @@
reg = <0x40007000 0x400>;
};
- pin-controller {
+ pinctrl:pin-controller {
#address-cells = <1>;
#size-cells = <1>;
compatible = "st,stm32f429-pinctrl";
diff --git a/arch/arm/boot/dts/stm32f469-disco.dts
b/arch/arm/boot/dts/stm32f469-disco.dts
index 8877c00..7b3458e 100644
--- a/arch/arm/boot/dts/stm32f469-disco.dts
+++ b/arch/arm/boot/dts/stm32f469-disco.dts
@@ -65,6 +65,13 @@
serial0 = &usart3;
};
+ mmc_vcard: mmc_vcard {
+ compatible = "regulator-fixed";
+ regulator-name = "mmc_vcard";
+ regulator-min-microvolt = <3300000>;
+ regulator-max-microvolt = <3300000>;
+ };
+
soc {
dma-ranges = <0xc0000000 0x0 0x10000000>;
};
@@ -78,6 +85,28 @@
clock-frequency = <8000000>;
};
+&pinctrl {
+ sdio-cd {
+ sdio_cd: sdio-cd {
+ pins {
+ pinmux = <STM32F429_PG2_FUNC_GPIO>;
+ bias-pull-up;
+ };
+ };
+ };
+};
+
As you only have config for 469-disco, please add this configuration of
pinmux directly in stm32f429.dtsi.
While in the process of moving this, I realized that there is
something wrong here..
Currently this pinmux config ended up to be not referenced by the SDIO
DT node at all. This happened in V2; it was intended to fix an
apparently double-claimed GPIO problem, but now I realized that I
misunderstood this thing, and it was a bad fix..
So, actually the SD works, but as soon as I reference the CD pinmux
config in the SDIO node, it fails with the following error:
[ 0.980000] stm32f429-pinctrl soc:pin-controller: pin PG2 already
requested by 40012c00.sdio; cannot claim for GPIOG:98
[ 0.990000] stm32f429-pinctrl soc:pin-controller: pin-98 (GPIOG:98)
status -22
[ 1.000000] mmci-pl18x: probe of 40012c00.sdio failed with error -22
I've bisected this to happen since the 'strict' flag has been added to
the stm32 pinctrl driver.
commit c32c22eea0c47e13cffd6b5f7eedd7a6b6f2c18f
Right now It seems that few pinctrl drivers use the 'strict' flag, so
maybe it could be a bug in pinctrl-realated code.
It is not a bug but added intentionally.
I need to look more in detail about this, however as far as I could understand:
- when the mmc layer asks for the CD pin, due to the "cd-gpios"
property, the owner name for this config request is not the one from
the OF node, but it is "conjured" - as written in comment - from the
GPIO number and name (GPIOG:98) in pinmux_request_gpio()
- the pinmux config done in behalf of the 'pinctrl-0' property has the
OF node name (40012c00.sdio) as owner.
I will look at deeper in the driver but first why you need to control
this pin by both way (gpio lib through gpio definition and pinctrl
framework through pinctrl definition) ?
In strict mode the error you get is "normal". You can't control the same
pin in the same time by gpiolib and pinctrl.
This owner mismatch causes a check to fail in pin_request(), that
believes that two different owners try to use the same pin (while in
true both are in behalf of the same SDIO device).
I don't know when I'll have more time to look into this. If you want I
can temporary drop the CD pinmux config and post the V3 - that
nevertheless works - and we can add the CD pinmux cfg later, once it
has been fixed.
In someone have clues, or want to look into this, he/she would be
really welcome :)
No problem, we can wait. Let's merge it when it will be fully functional.
Br
Alex
+&sdio {
+ status = "okay";
+ vmmc-supply = <&mmc_vcard>;
+ cd-gpios = <&gpiog 2 0>;
+ cd-inverted;
+ pinctrl-names = "default", "opendrain";
+ pinctrl-0 = <&sdio_pins>;
+ pinctrl-1 = <&sdio_pins_od>;
+ bus-width = <4>;
+};
+
&usart3 {
status = "okay";
};
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