On Tue, Feb 20, 2024 at 3:53 PM Herve Codina <herve.codina@xxxxxxxxxxx> wrote:
>
> On Tue, 20 Feb 2024 15:19:57 +0100
> Bartosz Golaszewski <brgl@xxxxxxxx> wrote:
>
> > On Tue, Feb 20, 2024 at 2:39 PM Herve Codina <herve.codina@xxxxxxxxxxx> wrote:
> > >
> > > Hi,
> > >
> > > Note: Resent this series with Saravana added in Cc.
> > >
> > > When a gpio used by the leds-gpio device is removed, the leds-gpio
> > > device continues to use this gpio. Also, when the gpio is back, the
> > > leds-gpio still uses the old removed gpio.
> > >
> > > A consumer/supplier relationship is missing between the leds-gpio device
> > > (consumer) and the gpio used (supplier).
> > >
> > > This series adds an addionnal devlink between this two device.
> > > With this link when the gpio is removed, the leds-gpio device is also
> > > removed.
> > >
> > > Best regards,
> > > Hervé Codina
> > >
> > > Herve Codina (2):
> > > gpiolib: Introduce gpiod_device_add_link()
> > > leds: gpio: Add devlinks between the gpio consumed and the gpio leds
> > > device
> > >
> > > drivers/gpio/gpiolib.c | 32 ++++++++++++++++++++++++++++++++
> > > drivers/leds/leds-gpio.c | 15 +++++++++++++++
> > > include/linux/gpio/consumer.h | 5 +++++
> > > 3 files changed, 52 insertions(+)
> > >
> > > --
> > > 2.43.0
> > >
> >
> > Can you add some more context here in the form of DT snippets that
> > lead to this being needed?
>
> / {
> leds-dock {
> compatible = "gpio-leds";
>
> led-5 {
> label = "dock:alarm:red";
> gpios = <&tca6424_dock_2 12 GPIO_ACTIVE_HIGH>;
> };
Do I understand correctly that the devlink is created between "led-5"
and "tca6424_dock_2" but actually should also be created between
"leds-dock" and "tca6424_dock_2"?
Bartosz
>
> led-6 {
> label = "dock:alarm:yellow";
> gpios = <&tca6424_dock_2 13 GPIO_ACTIVE_HIGH>;
> };
>
> led-7 {
> label = "dock:alarm:blue";
> gpios = <&tca6424_dock_2 14 GPIO_ACTIVE_HIGH>;
> };
> };
>
> ...
> i2c5 {
> ...
> tca6424_dock_2: gpio@23 {
> compatible = "ti,tca6424";
> reg = <0x23>;
> gpio-controller;
> #gpio-cells = <2>;
> interrupt-parent = <&tca6424_dock_1>;
> interrupts = <23 IRQ_TYPE_EDGE_FALLING>;
> interrupt-controller;
> #interrupt-cells = <2>;
> vcc-supply = <®_dock_ctrl_3v3>;
> };
> tca6424_dock_1: gpio@22 {
> compatible = "ti,tca6424";
> reg = <0x22>;
> gpio-controller;
> #gpio-cells = <2>;
> interrupt-parent = <&gpio4>;
> interrupts = <1 IRQ_TYPE_EDGE_FALLING>;
> interrupt-controller;
> #interrupt-cells = <2>;
> vcc-supply = <®_dock_ctrl_3v3>;
> };
> };
> };
>
> Also, had the exact same issue if I use a SoC gpio chip instead of an
> i2c gpio expander.
>
> Best regards,
> Hervé
