Re: [PATCH v3 11/12] arm64: dts: exynos: gs101: define USI8 with I2C configuration

Sam Protsenko
2024-01-16T18:04:08Z

On Tue, Jan 9, 2024 at 7:01 AM Tudor Ambarus <tudor.ambarus@linaro.org> wrote:
>
> USI8 I2C is used to communicate with an eeprom found on the battery
> connector. Define USI8 in I2C configuration.
>
> USI8 CONFIG register comes with a 0x0 reset value, meaning that USI8
> doesn't have a default protocol (I2C, SPI, UART) at reset. Thus the
> selection of the protocol is intentionally left for the board dts file.
>
> Signed-off-by: Tudor Ambarus <tudor.ambarus@linaro.org>
> ---
> v3: reorder usi8 clock order (thanks Andre'!). Did not make any
> difference at testing as the usi driver treats the clocks in bulk.
> v2:
> - identify and use gate clocks instead of dividers
> - move cells and pinctrl properties from dts to dtsi
> - move IRQ type constant on the previous line
>
> arch/arm64/boot/dts/exynos/google/gs101.dtsi | 29 ++++++++++++++++++++
> 1 file changed, 29 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/exynos/google/gs101.dtsi b/arch/arm64/boot/dts/exynos/google/gs101.dtsi
> index 6aa25cc4676e..f14a24628d04 100644
> --- a/arch/arm64/boot/dts/exynos/google/gs101.dtsi
> +++ b/arch/arm64/boot/dts/exynos/google/gs101.dtsi
> @@ -352,6 +352,35 @@ pinctrl_peric0: pinctrl@10840000 {
> interrupts = <GIC_SPI 625 IRQ_TYPE_LEVEL_HIGH 0>;
> };
>
> + usi8: usi@109700c0 {
> + compatible = "google,gs101-usi",
> + "samsung,exynos850-usi";
> + reg = <0x109700c0 0x20>;
> + ranges;
> + #address-cells = <1>;
> + #size-cells = <1>;
> + clocks = <&cmu_peric0 CLK_GOUT_PERIC0_CLK_PERIC0_USI8_USI_CLK>,
> + <&cmu_peric0 CLK_GOUT_PERIC0_PERIC0_TOP0_IPCLK_7>;
> + clock-names = "pclk", "ipclk";
> + samsung,sysreg = <&sysreg_peric0 0x101c>;

I'd also add samsung,mode for the "default" USI mode here, just to
avoid providing it later in the board's dts. But that's a matter of
taste I guess.

Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org>

> + status = "disabled";
> +
> + hsi2c_8: i2c@10970000 {
> + compatible = "google,gs101-hsi2c",
> + "samsung,exynosautov9-hsi2c";
> + reg = <0x10970000 0xc0>;
> + interrupts = <GIC_SPI 642 IRQ_TYPE_LEVEL_HIGH 0>;
> + #address-cells = <1>;
> + #size-cells = <0>;
> + pinctrl-names = "default";
> + pinctrl-0 = <&hsi2c8_bus>;
> + clocks = <&cmu_peric0 CLK_GOUT_PERIC0_PERIC0_TOP0_IPCLK_7>,
> + <&cmu_peric0 CLK_GOUT_PERIC0_CLK_PERIC0_USI8_USI_CLK>;
> + clock-names = "hsi2c", "hsi2c_pclk";
> + status = "disabled";
> + };
> + };
> +
> usi_uart: usi@10a000c0 {
> compatible = "google,gs101-usi",
> "samsung,exynos850-usi";
> --
> 2.43.0.472.g3155946c3a-goog
>
>