linux-kernel - Re: [PATCH 3/7] soc/tegra: pmc: Add interface to get IO rail power status

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Date:	Tue, 12 Apr 2016 19:13:24 +0100
From:	Jon Hunter <jonathanh@...dia.com>
To:	Laxman Dewangan <ldewangan@...dia.com>, <swarren@...dotorg.org>,
	<thierry.reding@...il.com>, <linus.walleij@...aro.org>,
	<gnurou@...il.com>, <robh+dt@...nel.org>, <mark.rutland@....com>
CC:	<linux-tegra@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-gpio@...r.kernel.org>
Subject: Re: [PATCH 3/7] soc/tegra: pmc: Add interface to get IO rail power
 status


On 12/04/16 15:56, Laxman Dewangan wrote:
> Add API to get the IO rail power status of the Tegra IO pads.
> This will help client driver to get the current power status
> of IO pads for handling IO pad power.
> 
> Signed-off-by: Laxman Dewangan <ldewangan@...dia.com>
> ---
>  drivers/soc/tegra/pmc.c | 16 ++++++++++++++++
>  include/soc/tegra/pmc.h |  6 ++++++
>  2 files changed, 22 insertions(+)
> 
> diff --git a/drivers/soc/tegra/pmc.c b/drivers/soc/tegra/pmc.c
> index 762f4fa..0bc8219 100644
> --- a/drivers/soc/tegra/pmc.c
> +++ b/drivers/soc/tegra/pmc.c
> @@ -613,6 +613,22 @@ error:
>  }
>  EXPORT_SYMBOL(tegra_io_rail_power_off);
>  
> +int tegra_io_rail_power_get_status(unsigned int id)
> +{
> +	unsigned long status, value;
> +	unsigned int mask;

These should all be u32 as tegra_pmc_readl() returns a u32.

Hmmm ... I see some of the other tegra_io_rail_xxx() APIs use a unsigned
long here too. We should fix those as well.

> +
> +	if ((id > 63) || (id == 30) || (id == 31))
> +		return -EINVAL;

Seems that this could vary per SoC and so I am wondering if we need a
bitmap for this?

> +
> +	status = (id < 32) ? IO_DPD_STATUS : IO_DPD2_STATUS;
> +	mask = BIT(id % 32);
> +	value = tegra_pmc_readl(status);
> +
> +	return !!(value & mask);

Nit-pick ... do you need this mask variable?

Cheers
Jon