Re: [PATCH v4 5/5] arm64: dts: exynos: gs101-oriole: enable Maxim max77759 fuel gauge

[Peter Griffin <peter.griffin@linaro.org>]

Hi Thomas,

Thanks for your patch and work to enable fuel gauge on Pixel 6!

On Fri, 23 May 2025 at 13:52, Thomas Antoine via B4 Relay
<devnull+t.antoine.uclouvain.be@kernel.org> wrote:
>
> From: Thomas Antoine <t.antoine@uclouvain.be>
>
> Add the node for the Maxim MAX77759 fuel gauge as a slave of the i2c.
>
> The TODO is still applicable given there are other slaves on the
> bus (e.g. PCA9468, other MAX77759 functions and the MAX20339 OVP).
>
> Signed-off-by: Thomas Antoine <t.antoine@uclouvain.be>
> ---
>  arch/arm64/boot/dts/exynos/google/gs101-pixel-common.dtsi | 10 ++++++++++
>  1 file changed, 10 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/exynos/google/gs101-pixel-common.dtsi b/arch/arm64/boot/dts/exynos/google/gs101-pixel-common.dtsi
> index b25230495c64dce60916b7cd5dcb9a7cce5d0e4e..84fc10c3562958ab1621f24644709e85a9433b9b 100644
> --- a/arch/arm64/boot/dts/exynos/google/gs101-pixel-common.dtsi
> +++ b/arch/arm64/boot/dts/exynos/google/gs101-pixel-common.dtsi
> @@ -10,6 +10,7 @@
>
>  #include <dt-bindings/gpio/gpio.h>
>  #include <dt-bindings/input/input.h>
> +#include <dt-bindings/interrupt-controller/irq.h>
>  #include <dt-bindings/usb/pd.h>
>  #include "gs101-pinctrl.h"
>  #include "gs101.dtsi"
> @@ -188,6 +189,15 @@ usbc0_role_sw: endpoint {
>                         };
>                 };
>         };
> +
> +       fuel-gauge@36 {
> +               compatible = "maxim,max77759-fg";
> +               reg = <0x36>;
> +               reg-names = "m5";
> +               interrupt-parent = <&gpa9>;
> +               interrupts = <3 IRQ_TYPE_LEVEL_LOW>;
> +               shunt-resistor-micro-ohms = <5000>;
> +       };
>  };
>

If gpa-9-3 is being used for the interrupt I think we should also add
the pinctrl configuration for it. Taking a look at downstream the pin
is defined as

&pinctrl_0 {
/* [MAX77759: FG_INTB] > FG_INT_L > [XEINT_23 : SC59845XWE] */
        if_pmic_fg_irq: if-pmic-fg-irq {
                samsung,pins = "gpa9-3"; /* XEINT_23 */
                samsung,pin-function = <EXYNOS_PIN_FUNC_EINT>;
                samsung,pin-pud = <EXYNOS_PIN_PULL_UP>;
                samsung,pin-drv = <GS101_PIN_DRV_2_5_MA>;
        };
};

and then the fuel-gauge node declares

/* FG_INT_L -> XEINT_23 */
pinctrl-names = "default";
pinctrl-0 = <&if_pmic_fg_irq>;

regards,

Peter