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@xxxxxxxxxx>
> ---
> 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.
