linux-kernel - Re: [PATCH v2 1/3] arm64: dts: qcom: Add PMI8996 DTSI file

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Message-ID: <YLT+zsYBEAcLh+k7@builder.lan>
Date:   Mon, 31 May 2021 10:20:46 -0500
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Konrad Dybcio <konrad.dybcio@...ainline.org>
Cc:     ~postmarketos/upstreaming@...ts.sr.ht, martin.botka@...ainline.org,
        angelogioacchino.delregno@...ainline.org,
        marijn.suijten@...ainline.org, jamipkettunen@...ainline.org,
        Andy Gross <agross@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/3] arm64: dts: qcom: Add PMI8996 DTSI file

On Thu 27 May 12:04 CDT 2021, Konrad Dybcio wrote:

> PMI8996 is *almost* the same hardware as PMI8994, say for some annoyances:
> 
> - Boards equipped with PMI8996 now have to include pmic-id (which wasn't the case before)
> - Different qpnp-ibb-discharge-resistor value (will be addressed after LABIBB is introduced)
> - Different inhibit-derating-ua value (will be addressed after BCL is introduced)
> - Different ramp_up_step value (will be addressed after [if?] QPNP Flash LED is introduced)
> 

If I am to support a device that has a pmi8996, I will go

#include "pmi8996.dtsi"

and wonder why it didn't work.

But, I do see the validity in your argumentation in the previous
revision so I won't object. But I really would like you to describe in
the commit message why this is different from what people would expect
to find.

> Signed-off-by: Konrad Dybcio <konrad.dybcio@...ainline.org>
> ---
>  arch/arm64/boot/dts/qcom/pmi8996.dtsi | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
>  create mode 100644 arch/arm64/boot/dts/qcom/pmi8996.dtsi
> 
> diff --git a/arch/arm64/boot/dts/qcom/pmi8996.dtsi b/arch/arm64/boot/dts/qcom/pmi8996.dtsi
> new file mode 100644
> index 000000000000..31b47209e261
> --- /dev/null
> +++ b/arch/arm64/boot/dts/qcom/pmi8996.dtsi
> @@ -0,0 +1,15 @@
> +// SPDX-License-Identifier: GPL-2.0

And BSD please :)

Regards,
Bjorn

> +/*
> + * Copyright (c) 2021, Konrad Dybcio <konrad.dybcio@...ainline.org>
> + */
> +
> + /*
> +  * PMI8996 is a slight modification of PMI8994 with
> +  * some notable changes, like being the first PMIC
> +  * whose the bootloader has to check to continue booting
> +  * and a change to a LABIBB parameter.
> +  */
> +
> +/ {
> +	qcom,pmic-id = <0x20009 0x10013 0 0>;
> +};
> -- 
> 2.31.1
>