linux-kernel - Re: [RESEND PATCH v1 1/2] thermal: qcom-spmi-temp-alarm: add support for GEN2 rev 1 PMIC peripherals

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Message-ID: <159598490848.1360974.3638464473515157786@swboyd.mtv.corp.google.com>
Date:   Tue, 28 Jul 2020 18:08:28 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Guru Das Srinagesh <gurus@...eaurora.org>,
        linux-arm-msm@...r.kernel.org
Cc:     Subbaraman Narayanamurthy <subbaram@...eaurora.org>,
        David Collins <collinsd@...eaurora.org>,
        linux-kernel@...r.kernel.org,
        Guru Das Srinagesh <gurus@...eaurora.org>
Subject: Re: [RESEND PATCH v1 1/2] thermal: qcom-spmi-temp-alarm: add support for GEN2 rev 1 PMIC peripherals

Quoting Guru Das Srinagesh (2020-07-24 10:46:10)
> diff --git a/drivers/thermal/qcom/qcom-spmi-temp-alarm.c b/drivers/thermal/qcom/qcom-spmi-temp-alarm.c
> index bf7bae4..05a9601 100644
> --- a/drivers/thermal/qcom/qcom-spmi-temp-alarm.c
> +++ b/drivers/thermal/qcom/qcom-spmi-temp-alarm.c
> @@ -38,26 +39,30 @@
>  
>  #define ALARM_CTRL_FORCE_ENABLE                BIT(7)
>  
> -/*
> - * Trip point values based on threshold control
> - * 0 = {105 C, 125 C, 145 C}
> - * 1 = {110 C, 130 C, 150 C}
> - * 2 = {115 C, 135 C, 155 C}
> - * 3 = {120 C, 140 C, 160 C}
> -*/
> -#define TEMP_STAGE_STEP                        20000   /* Stage step: 20.000 C */
> -#define TEMP_STAGE_HYSTERESIS          2000
> +#define THRESH_COUNT                   4
> +#define STAGE_COUNT                    3
> +
> +/* Over-temperature trip point values in mC */
> +static const long temp_map_gen1[THRESH_COUNT][STAGE_COUNT] = {
> +       {105000, 125000, 145000},

Please add a space after { and before }

> +       {110000, 130000, 150000},
> +       {115000, 135000, 155000},
> +       {120000, 140000, 160000},
> +};
> +
> +static const long temp_map_gen2_v1[THRESH_COUNT][STAGE_COUNT] = {
> +       { 90000, 110000, 140000},

Almost.

> +       { 95000, 115000, 145000},
> +       {100000, 120000, 150000},
> +       {105000, 125000, 155000},
> +};
>  
> -#define TEMP_THRESH_MIN                        105000  /* Threshold Min: 105 C */
> -#define TEMP_THRESH_STEP               5000    /* Threshold step: 5 C */
> +#define TEMP_THRESH_STEP               5000 /* Threshold step: 5 C */
>  
>  #define THRESH_MIN                     0
>  #define THRESH_MAX                     3
>  
> -/* Stage 2 Threshold Min: 125 C */
> -#define STAGE2_THRESHOLD_MIN           125000
> -/* Stage 2 Threshold Max: 140 C */
> -#define STAGE2_THRESHOLD_MAX           140000
> +#define TEMP_STAGE_HYSTERESIS          2000
>  
>  /* Temperature in Milli Celsius reported during stage 0 if no ADC is present */
>  #define DEFAULT_TEMP                   37000
> @@ -77,6 +82,7 @@ struct qpnp_tm_chip {
>         bool                            initialized;
>  
>         struct iio_channel              *adc;
> +       const long                      (*temp_map)[THRESH_COUNT][STAGE_COUNT];

It can be negative Celsius?

>  };
>  
>  /* This array maps from GEN2 alarm state to GEN1 alarm stage */
> @@ -101,6 +107,23 @@ static int qpnp_tm_write(struct qpnp_tm_chip *chip, u16 addr, u8 data)
>  }
>  
>  /**
> + * qpnp_tm_decode_temp() - return temperature in mC corresponding to the
> + *             specified over-temperature stage
> + * @chip:              Pointer to the qpnp_tm chip
> + * @stage:             Over-temperature stage
> + *
> + * Return: temperature in mC
> + */
> +static long qpnp_tm_decode_temp(struct qpnp_tm_chip *chip, unsigned int stage)
> +{
> +       if (!chip->temp_map || chip->thresh >= THRESH_COUNT || stage == 0
> +           || stage > STAGE_COUNT)

Nitpick: The || goes on the line above.

> +               return 0;
> +
> +       return (*chip->temp_map)[chip->thresh][stage - 1];
> +}
> +
> +/**
>   * qpnp_tm_get_temp_stage() - return over-temperature stage
>   * @chip:              Pointer to the qpnp_tm chip
>   *