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Date: Sun, 23 Jun 2024 12:59:01 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: Sean Anderson <sean.anderson@...ux.dev>
Cc: Anand Ashok Dumbre <anand.ashok.dumbre@...inx.com>,
linux-iio@...r.kernel.org, Lars-Peter Clausen <lars@...afoo.de>, Michal
Simek <michal.simek@....com>, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] iio: xilinx-ams: Add labels
On Thu, 20 Jun 2024 16:48:42 -0400
Sean Anderson <sean.anderson@...ux.dev> wrote:
> Label all the channels using names from the reference manual. Some of
> the "control" channels are duplicates of other channels. The reference
> manual describes it like:
>
> > The AMS register set includes several measurement registers that are
> > written to by the PS SYSMON unit using the single-channel mode
> > (sequencer off). These voltage measurements are performed using the
> > unipolar sampling circuit with a 0 to 3V range and do not have alarms
> > or minimum/maximum registers.
>
> So I think these really are measuring the same voltages but in a
> different location. In which case, sharing labels makes sense to me.
>
> Signed-off-by: Sean Anderson <sean.anderson@...ux.dev>
Hi Sean,
This LGTM, but I'd like some feedback from others more familiar with the
driver and device before I apply it. If everyone is too busy and
I don't get any replies for a few weeks I may pick it up anyway.
Feel free to poke me if I seem to have forgotten in say 2 weeks.
Jonathan
> ---
>
> drivers/iio/adc/xilinx-ams.c | 107 +++++++++++++++++++----------------
> 1 file changed, 59 insertions(+), 48 deletions(-)
>
> diff --git a/drivers/iio/adc/xilinx-ams.c b/drivers/iio/adc/xilinx-ams.c
> index aa05f24931f9..f051358d6b50 100644
> --- a/drivers/iio/adc/xilinx-ams.c
> +++ b/drivers/iio/adc/xilinx-ams.c
> @@ -222,7 +222,7 @@ enum ams_ps_pl_seq {
> #define PL_SEQ(x) (AMS_PS_SEQ_MAX + (x))
> #define AMS_CTRL_SEQ_BASE (AMS_PS_SEQ_MAX * 3)
>
> -#define AMS_CHAN_TEMP(_scan_index, _addr) { \
> +#define AMS_CHAN_TEMP(_scan_index, _addr, _name) { \
> .type = IIO_TEMP, \
> .indexed = 1, \
> .address = (_addr), \
> @@ -232,9 +232,10 @@ enum ams_ps_pl_seq {
> .event_spec = ams_temp_events, \
> .scan_index = _scan_index, \
> .num_event_specs = ARRAY_SIZE(ams_temp_events), \
> + .datasheet_name = _name, \
> }
>
> -#define AMS_CHAN_VOLTAGE(_scan_index, _addr, _alarm) { \
> +#define AMS_CHAN_VOLTAGE(_scan_index, _addr, _alarm, _name) { \
> .type = IIO_VOLTAGE, \
> .indexed = 1, \
> .address = (_addr), \
> @@ -243,21 +244,24 @@ enum ams_ps_pl_seq {
> .event_spec = (_alarm) ? ams_voltage_events : NULL, \
> .scan_index = _scan_index, \
> .num_event_specs = (_alarm) ? ARRAY_SIZE(ams_voltage_events) : 0, \
> + .datasheet_name = _name, \
> }
>
> -#define AMS_PS_CHAN_TEMP(_scan_index, _addr) \
> - AMS_CHAN_TEMP(PS_SEQ(_scan_index), _addr)
> -#define AMS_PS_CHAN_VOLTAGE(_scan_index, _addr) \
> - AMS_CHAN_VOLTAGE(PS_SEQ(_scan_index), _addr, true)
> +#define AMS_PS_CHAN_TEMP(_scan_index, _addr, _name) \
> + AMS_CHAN_TEMP(PS_SEQ(_scan_index), _addr, _name)
> +#define AMS_PS_CHAN_VOLTAGE(_scan_index, _addr, _name) \
> + AMS_CHAN_VOLTAGE(PS_SEQ(_scan_index), _addr, true, _name)
>
> -#define AMS_PL_CHAN_TEMP(_scan_index, _addr) \
> - AMS_CHAN_TEMP(PL_SEQ(_scan_index), _addr)
> -#define AMS_PL_CHAN_VOLTAGE(_scan_index, _addr, _alarm) \
> - AMS_CHAN_VOLTAGE(PL_SEQ(_scan_index), _addr, _alarm)
> +#define AMS_PL_CHAN_TEMP(_scan_index, _addr, _name) \
> + AMS_CHAN_TEMP(PL_SEQ(_scan_index), _addr, _name)
> +#define AMS_PL_CHAN_VOLTAGE(_scan_index, _addr, _alarm, _name) \
> + AMS_CHAN_VOLTAGE(PL_SEQ(_scan_index), _addr, _alarm, _name)
> #define AMS_PL_AUX_CHAN_VOLTAGE(_auxno) \
> - AMS_CHAN_VOLTAGE(PL_SEQ(AMS_SEQ(_auxno)), AMS_REG_VAUX(_auxno), false)
> -#define AMS_CTRL_CHAN_VOLTAGE(_scan_index, _addr) \
> - AMS_CHAN_VOLTAGE(PL_SEQ(AMS_SEQ(AMS_SEQ(_scan_index))), _addr, false)
> + AMS_CHAN_VOLTAGE(PL_SEQ(AMS_SEQ(_auxno)), AMS_REG_VAUX(_auxno), false, \
> + "VAUX" #_auxno)
> +#define AMS_CTRL_CHAN_VOLTAGE(_scan_index, _addr, _name) \
> + AMS_CHAN_VOLTAGE(PL_SEQ(AMS_SEQ(AMS_SEQ(_scan_index))), _addr, false, \
> + _name)
>
> /**
> * struct ams - This structure contains necessary state for xilinx-ams to operate
> @@ -505,6 +509,12 @@ static int ams_init_device(struct ams *ams)
> return 0;
> }
>
> +static int ams_read_label(struct iio_dev *indio_dev,
> + struct iio_chan_spec const *chan, char *label)
> +{
> + return sysfs_emit(label, "%s\n", chan->datasheet_name);
> +}
> +
> static int ams_enable_single_channel(struct ams *ams, unsigned int offset)
> {
> u8 channel_num;
> @@ -1116,37 +1126,37 @@ static const struct iio_event_spec ams_voltage_events[] = {
> };
>
> static const struct iio_chan_spec ams_ps_channels[] = {
> - AMS_PS_CHAN_TEMP(AMS_SEQ_TEMP, AMS_TEMP),
> - AMS_PS_CHAN_TEMP(AMS_SEQ_TEMP_REMOTE, AMS_TEMP_REMOTE),
> - AMS_PS_CHAN_VOLTAGE(AMS_SEQ_SUPPLY1, AMS_SUPPLY1),
> - AMS_PS_CHAN_VOLTAGE(AMS_SEQ_SUPPLY2, AMS_SUPPLY2),
> - AMS_PS_CHAN_VOLTAGE(AMS_SEQ_SUPPLY3, AMS_SUPPLY3),
> - AMS_PS_CHAN_VOLTAGE(AMS_SEQ_SUPPLY4, AMS_SUPPLY4),
> - AMS_PS_CHAN_VOLTAGE(AMS_SEQ_SUPPLY5, AMS_SUPPLY5),
> - AMS_PS_CHAN_VOLTAGE(AMS_SEQ_SUPPLY6, AMS_SUPPLY6),
> - AMS_PS_CHAN_VOLTAGE(AMS_SEQ_SUPPLY7, AMS_SUPPLY7),
> - AMS_PS_CHAN_VOLTAGE(AMS_SEQ_SUPPLY8, AMS_SUPPLY8),
> - AMS_PS_CHAN_VOLTAGE(AMS_SEQ_SUPPLY9, AMS_SUPPLY9),
> - AMS_PS_CHAN_VOLTAGE(AMS_SEQ_SUPPLY10, AMS_SUPPLY10),
> - AMS_PS_CHAN_VOLTAGE(AMS_SEQ_VCCAMS, AMS_VCCAMS),
> + AMS_PS_CHAN_TEMP(AMS_SEQ_TEMP, AMS_TEMP, "Temp_LPD"),
> + AMS_PS_CHAN_TEMP(AMS_SEQ_TEMP_REMOTE, AMS_TEMP_REMOTE, "Temp_FPD"),
> + AMS_PS_CHAN_VOLTAGE(AMS_SEQ_SUPPLY1, AMS_SUPPLY1, "VCC_PSINTLP"),
> + AMS_PS_CHAN_VOLTAGE(AMS_SEQ_SUPPLY2, AMS_SUPPLY2, "VCC_PSINTFP"),
> + AMS_PS_CHAN_VOLTAGE(AMS_SEQ_SUPPLY3, AMS_SUPPLY3, "VCC_PSAUX"),
> + AMS_PS_CHAN_VOLTAGE(AMS_SEQ_SUPPLY4, AMS_SUPPLY4, "VCC_PSDDR"),
> + AMS_PS_CHAN_VOLTAGE(AMS_SEQ_SUPPLY5, AMS_SUPPLY5, "VCC_PSIO3"),
> + AMS_PS_CHAN_VOLTAGE(AMS_SEQ_SUPPLY6, AMS_SUPPLY6, "VCC_PSIO0"),
> + AMS_PS_CHAN_VOLTAGE(AMS_SEQ_SUPPLY7, AMS_SUPPLY7, "VCC_PSIO1"),
> + AMS_PS_CHAN_VOLTAGE(AMS_SEQ_SUPPLY8, AMS_SUPPLY8, "VCC_PSIO2"),
> + AMS_PS_CHAN_VOLTAGE(AMS_SEQ_SUPPLY9, AMS_SUPPLY9, "PS_MGTRAVCC"),
> + AMS_PS_CHAN_VOLTAGE(AMS_SEQ_SUPPLY10, AMS_SUPPLY10, "PS_MGTRAVTT"),
> + AMS_PS_CHAN_VOLTAGE(AMS_SEQ_VCCAMS, AMS_VCCAMS, "VCC_PSADC"),
> };
>
> static const struct iio_chan_spec ams_pl_channels[] = {
> - AMS_PL_CHAN_TEMP(AMS_SEQ_TEMP, AMS_TEMP),
> - AMS_PL_CHAN_VOLTAGE(AMS_SEQ_SUPPLY1, AMS_SUPPLY1, true),
> - AMS_PL_CHAN_VOLTAGE(AMS_SEQ_SUPPLY2, AMS_SUPPLY2, true),
> - AMS_PL_CHAN_VOLTAGE(AMS_SEQ_VREFP, AMS_VREFP, false),
> - AMS_PL_CHAN_VOLTAGE(AMS_SEQ_VREFN, AMS_VREFN, false),
> - AMS_PL_CHAN_VOLTAGE(AMS_SEQ_SUPPLY3, AMS_SUPPLY3, true),
> - AMS_PL_CHAN_VOLTAGE(AMS_SEQ_SUPPLY4, AMS_SUPPLY4, true),
> - AMS_PL_CHAN_VOLTAGE(AMS_SEQ_SUPPLY5, AMS_SUPPLY5, true),
> - AMS_PL_CHAN_VOLTAGE(AMS_SEQ_SUPPLY6, AMS_SUPPLY6, true),
> - AMS_PL_CHAN_VOLTAGE(AMS_SEQ_VCCAMS, AMS_VCCAMS, true),
> - AMS_PL_CHAN_VOLTAGE(AMS_SEQ_VP_VN, AMS_VP_VN, false),
> - AMS_PL_CHAN_VOLTAGE(AMS_SEQ_SUPPLY7, AMS_SUPPLY7, true),
> - AMS_PL_CHAN_VOLTAGE(AMS_SEQ_SUPPLY8, AMS_SUPPLY8, true),
> - AMS_PL_CHAN_VOLTAGE(AMS_SEQ_SUPPLY9, AMS_SUPPLY9, true),
> - AMS_PL_CHAN_VOLTAGE(AMS_SEQ_SUPPLY10, AMS_SUPPLY10, true),
> + AMS_PL_CHAN_TEMP(AMS_SEQ_TEMP, AMS_TEMP, "Temp_PL"),
> + AMS_PL_CHAN_VOLTAGE(AMS_SEQ_SUPPLY1, AMS_SUPPLY1, true, "VCCINT"),
> + AMS_PL_CHAN_VOLTAGE(AMS_SEQ_SUPPLY2, AMS_SUPPLY2, true, "VCCAUX"),
> + AMS_PL_CHAN_VOLTAGE(AMS_SEQ_VREFP, AMS_VREFP, false, "VREFP"),
> + AMS_PL_CHAN_VOLTAGE(AMS_SEQ_VREFN, AMS_VREFN, false, "VREFN"),
> + AMS_PL_CHAN_VOLTAGE(AMS_SEQ_SUPPLY3, AMS_SUPPLY3, true, "VCCBRAM"),
> + AMS_PL_CHAN_VOLTAGE(AMS_SEQ_SUPPLY4, AMS_SUPPLY4, true, "VCC_PSINTLP"),
> + AMS_PL_CHAN_VOLTAGE(AMS_SEQ_SUPPLY5, AMS_SUPPLY5, true, "VCC_PSINTFP"),
> + AMS_PL_CHAN_VOLTAGE(AMS_SEQ_SUPPLY6, AMS_SUPPLY6, true, "VCC_PSAUX"),
> + AMS_PL_CHAN_VOLTAGE(AMS_SEQ_VCCAMS, AMS_VCCAMS, true, "VCCAMS"),
> + AMS_PL_CHAN_VOLTAGE(AMS_SEQ_VP_VN, AMS_VP_VN, false, "VP_VN"),
> + AMS_PL_CHAN_VOLTAGE(AMS_SEQ_SUPPLY7, AMS_SUPPLY7, true, "VUser0"),
> + AMS_PL_CHAN_VOLTAGE(AMS_SEQ_SUPPLY8, AMS_SUPPLY8, true, "VUser1"),
> + AMS_PL_CHAN_VOLTAGE(AMS_SEQ_SUPPLY9, AMS_SUPPLY9, true, "VUser2"),
> + AMS_PL_CHAN_VOLTAGE(AMS_SEQ_SUPPLY10, AMS_SUPPLY10, true, "VUser3"),
> AMS_PL_AUX_CHAN_VOLTAGE(0),
> AMS_PL_AUX_CHAN_VOLTAGE(1),
> AMS_PL_AUX_CHAN_VOLTAGE(2),
> @@ -1166,13 +1176,13 @@ static const struct iio_chan_spec ams_pl_channels[] = {
> };
>
> static const struct iio_chan_spec ams_ctrl_channels[] = {
> - AMS_CTRL_CHAN_VOLTAGE(AMS_SEQ_VCC_PSPLL, AMS_VCC_PSPLL0),
> - AMS_CTRL_CHAN_VOLTAGE(AMS_SEQ_VCC_PSBATT, AMS_VCC_PSPLL3),
> - AMS_CTRL_CHAN_VOLTAGE(AMS_SEQ_VCCINT, AMS_VCCINT),
> - AMS_CTRL_CHAN_VOLTAGE(AMS_SEQ_VCCBRAM, AMS_VCCBRAM),
> - AMS_CTRL_CHAN_VOLTAGE(AMS_SEQ_VCCAUX, AMS_VCCAUX),
> - AMS_CTRL_CHAN_VOLTAGE(AMS_SEQ_PSDDRPLL, AMS_PSDDRPLL),
> - AMS_CTRL_CHAN_VOLTAGE(AMS_SEQ_INTDDR, AMS_PSINTFPDDR),
> + AMS_CTRL_CHAN_VOLTAGE(AMS_SEQ_VCC_PSPLL, AMS_VCC_PSPLL0, "VCC_PSPLL"),
> + AMS_CTRL_CHAN_VOLTAGE(AMS_SEQ_VCC_PSBATT, AMS_VCC_PSPLL3, "VCC_PSBATT"),
> + AMS_CTRL_CHAN_VOLTAGE(AMS_SEQ_VCCINT, AMS_VCCINT, "VCCINT"),
> + AMS_CTRL_CHAN_VOLTAGE(AMS_SEQ_VCCBRAM, AMS_VCCBRAM, "VCCBRAM"),
> + AMS_CTRL_CHAN_VOLTAGE(AMS_SEQ_VCCAUX, AMS_VCCAUX, "VCCAUX"),
> + AMS_CTRL_CHAN_VOLTAGE(AMS_SEQ_PSDDRPLL, AMS_PSDDRPLL, "VCC_PSDDR_PLL"),
> + AMS_CTRL_CHAN_VOLTAGE(AMS_SEQ_INTDDR, AMS_PSINTFPDDR, "VCC_PSINTFP_DDR"),
> };
>
> static int ams_get_ext_chan(struct fwnode_handle *chan_node,
> @@ -1336,6 +1346,7 @@ static int ams_parse_firmware(struct iio_dev *indio_dev)
> }
>
> static const struct iio_info iio_ams_info = {
> + .read_label = ams_read_label,
> .read_raw = &ams_read_raw,
> .read_event_config = &ams_read_event_config,
> .write_event_config = &ams_write_event_config,
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