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

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Date: Tue, 16 Jan 2024 12:03:56 -0600
From: Sam Protsenko <semen.protsenko@...aro.org>
To: Tudor Ambarus <tudor.ambarus@...aro.org>
Cc: peter.griffin@...aro.org, krzysztof.kozlowski+dt@...aro.org, 
	gregkh@...uxfoundation.org, mturquette@...libre.com, sboyd@...nel.org, 
	robh+dt@...nel.org, conor+dt@...nel.org, andi.shyti@...nel.org, 
	alim.akhtar@...sung.com, jirislaby@...nel.org, s.nawrocki@...sung.com, 
	tomasz.figa@...il.com, cw00.choi@...sung.com, 
	linux-arm-kernel@...ts.infradead.org, linux-samsung-soc@...r.kernel.org, 
	linux-clk@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org, 
	linux-serial@...r.kernel.org, andre.draszik@...aro.org, 
	kernel-team@...roid.com, willmcvicker@...gle.com
Subject: Re: [PATCH v3 11/12] arm64: dts: exynos: gs101: define USI8 with I2C configuration

On Tue, Jan 9, 2024 at 7:01 AM Tudor Ambarus <tudor.ambarus@...aro.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@...aro.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@...40000 {
>                         interrupts = <GIC_SPI 625 IRQ_TYPE_LEVEL_HIGH 0>;
>                 };
>
> +               usi8: usi@...700c0 {
> +                       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@...aro.org>

> +                       status = "disabled";
> +
> +                       hsi2c_8: i2c@...70000 {
> +                               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@...000c0 {
>                         compatible = "google,gs101-usi",
>                                      "samsung,exynos850-usi";
> --
> 2.43.0.472.g3155946c3a-goog
>
>