linux-kernel - Re: [PATCH v2 3/3] soc/tegra: regulators: Add regulators coupler for Tegra30

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Message-ID: <20190802140512.GD3883@pdeschrijver-desktop.Nvidia.com>
Date:   Fri, 2 Aug 2019 17:05:12 +0300
From:   Peter De Schrijver <pdeschrijver@...dia.com>
To:     Dmitry Osipenko <digetx@...il.com>
CC:     Rob Herring <robh+dt@...nel.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        "Mark Brown" <broonie@...nel.org>, <devicetree@...r.kernel.org>,
        <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 3/3] soc/tegra: regulators: Add regulators coupler for
 Tegra30

On Thu, Jul 25, 2019 at 06:18:32PM +0300, Dmitry Osipenko wrote:
> Add regulators coupler for Tegra30 SoCs that performs voltage balancing
> of a coupled regulators and thus provides voltage scaling functionality.
> 
> There are 2 coupled regulators on all Tegra30 SoCs: CORE and CPU. The
> coupled regulator voltages shall be in a range of 300mV from each other
> and CORE voltage shall be higher than the CPU by N mV, where N depends
> on the CPU voltage.
> 
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> ---
>  drivers/soc/tegra/Kconfig              |   4 +
>  drivers/soc/tegra/Makefile             |   1 +
>  drivers/soc/tegra/regulators-tegra30.c | 316 +++++++++++++++++++++++++
>  3 files changed, 321 insertions(+)
>  create mode 100644 drivers/soc/tegra/regulators-tegra30.c
> 
...

> +
> +static int tegra30_core_cpu_limit(int cpu_uV)
> +{
> +	if (cpu_uV < 800000)
> +		return 950000;
> +
> +	if (cpu_uV < 900000)
> +		return 1000000;
> +
> +	if (cpu_uV < 1000000)
> +		return 1100000;
> +
> +	if (cpu_uV < 1100000)
> +		return 1200000;
> +
> +	if (cpu_uV < 1250000) {
> +		switch (tegra_sku_info.cpu_speedo_id) {
> +		case 0 ... 1:
Aren't we supposed to add /* fall through */ here now?
> +		case 4:
> +		case 7 ... 8:
> +			return 1200000;
> +
> +		default:
> +			return 1300000;
> +		}
> +	}
> +

Other than that, this looks ok to me.

Peter.