linux-kernel - Re: [PATCH V2 1/3] soc/tegra: fuse: Add custom SoC attributes

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Message-ID: <bd1b2056-dc72-323b-bda5-d99df3a139a6@nvidia.com>
Date:   Tue, 31 Mar 2020 14:56:51 +0100
From:   Jon Hunter <jonathanh@...dia.com>
To:     Dmitry Osipenko <digetx@...il.com>,
        Thierry Reding <thierry.reding@...il.com>
CC:     <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2 1/3] soc/tegra: fuse: Add custom SoC attributes


On 31/03/2020 14:39, Dmitry Osipenko wrote:
> 31.03.2020 13:33, Jon Hunter пишет:
>> Add a custom SoC attribute for Tegra to expose the HIDREV register
>> fields to userspace via the sysfs. This register provides additional
>> details about the type of device (eg, silicon, FPGA, etc) as well as
>> revision. Exposing this information is useful for identifying the
>> exact device revision and device type.
>>
>> For Tegra devices up until Tegra186, the majorrev and minorrev fields of
>> the HIDREV register are used to determine the device revision and device
>> type. For Tegra194, the majorrev and minorrev fields only determine the
>> revision. Starting with Tegra194, there is an additional field,
>> pre_si_platform (which occupies bits 20-23), that now determines device
>> type. Therefore, for all Tegra devices, add a custom SoC attribute for
>> the majorrev and minorrev fields and for Tegra194 add an additional
>> attribute for the pre_si_platform field.
>>
>> Signed-off-by: Jon Hunter <jonathanh@...dia.com>
>> ---
>>  drivers/soc/tegra/fuse/fuse-tegra.c    | 51 ++++++++++++++++++++++++++
>>  drivers/soc/tegra/fuse/fuse-tegra20.c  |  1 +
>>  drivers/soc/tegra/fuse/fuse-tegra30.c  |  6 +++
>>  drivers/soc/tegra/fuse/fuse.h          |  8 ++++
>>  drivers/soc/tegra/fuse/tegra-apbmisc.c | 10 +++++
>>  5 files changed, 76 insertions(+)
>>
>> diff --git a/drivers/soc/tegra/fuse/fuse-tegra.c b/drivers/soc/tegra/fuse/fuse-tegra.c
>> index 802717b9f6a3..639734dca5df 100644
>> --- a/drivers/soc/tegra/fuse/fuse-tegra.c
>> +++ b/drivers/soc/tegra/fuse/fuse-tegra.c
>> @@ -300,6 +300,56 @@ static void tegra_enable_fuse_clk(void __iomem *base)
>>  	writel(reg, base + 0x14);
>>  }
>>  
>> +static ssize_t tegra_soc_majorrev_show(struct device *dev,
>> +				       struct device_attribute *attr,
>> +				       char *buf)
>> +{
>> +	return sprintf(buf, "%d\n", tegra_get_major_rev());
>> +}
>> +
>> +static DEVICE_ATTR(majorrev, S_IRUGO, tegra_soc_majorrev_show,  NULL);
>> +
>> +static ssize_t tegra_soc_minorrev_show(struct device *dev,
>> +				       struct device_attribute *attr,
>> +				       char *buf)
>> +{
>> +	return sprintf(buf, "%d\n", tegra_get_minor_rev());
>> +}
>> +
>> +static DEVICE_ATTR(minorrev, S_IRUGO, tegra_soc_minorrev_show,  NULL);
> 
> Checkpatch should give a warning about that permission isn't in octal
> format, please don't ignore it.

Indeed. Will fix. I thought I had ran this previously, obviously not.

Jon

-- 
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