[6/7] cpu: imx_cpu: Print the CPU temperature for iMX8QM A72

From: Ye Li <ye.li at nxp.com>

iMX8QM registers two thermal devices for CPUs, get the temperature
from "cpu-thermal1" device for A72

Signed-off-by: Ye Li <ye.li at nxp.com>
Signed-off-by: Peng Fan <peng.fan at nxp.com>
---
 drivers/cpu/imx8_cpu.c | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

Hi Peng,

On Tue, 28 Apr 2020 at 19:54, Peng Fan <peng.fan at nxp.com> wrote:
>
> From: Ye Li <ye.li at nxp.com>
>
> iMX8QM registers two thermal devices for CPUs, get the temperature
> from "cpu-thermal1" device for A72
>
> Signed-off-by: Ye Li <ye.li at nxp.com>
> Signed-off-by: Peng Fan <peng.fan at nxp.com>
> ---
>  drivers/cpu/imx8_cpu.c | 20 ++++++++++++++------
>  1 file changed, 14 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/cpu/imx8_cpu.c b/drivers/cpu/imx8_cpu.c
> index 525c28bc4b..d99d9aacd9 100644
> --- a/drivers/cpu/imx8_cpu.c
> +++ b/drivers/cpu/imx8_cpu.c
> @@ -61,13 +61,17 @@ const char *get_core_name(struct udevice *dev)
>  }
>
>  #if IS_ENABLED(CONFIG_IMX_SCU_THERMAL)
> -static int cpu_imx_get_temp(void)
> +static int cpu_imx_get_temp(struct cpu_imx_platdata *plat)
>  {
>         struct udevice *thermal_dev;
>         int cpu_tmp, ret;
>
> -       ret = uclass_get_device_by_name(UCLASS_THERMAL, "cpu-thermal0",
> -                                       &thermal_dev);
> +       if (!strcmp(plat->name, "A72"))
> +               ret = uclass_get_device_by_name(UCLASS_THERMAL, "cpu-thermal1",
> +                                               &thermal_dev);

This is very slow.

Use uclass_get_device_by_seq()
or just uclass_get_device(UCLASS_THERMAL, 0..1..2)

> +       else
> +               ret = uclass_get_device_by_name(UCLASS_THERMAL, "cpu-thermal0",
> +                                               &thermal_dev);
>
>         if (!ret) {
>                 ret = thermal_get_temp(thermal_dev, &cpu_tmp);
> @@ -80,7 +84,7 @@ static int cpu_imx_get_temp(void)
>         return cpu_tmp;
>  }
>  #else
> -static int cpu_imx_get_temp(void)
> +static int cpu_imx_get_temp(struct cpu_imx_platdata *plat)
>  {
>         return 0;
>  }
> @@ -89,7 +93,7 @@ static int cpu_imx_get_temp(void)
>  int cpu_imx_get_desc(struct udevice *dev, char *buf, int size)
>  {
>         struct cpu_imx_platdata *plat = dev_get_platdata(dev);
> -       int ret;
> +       int ret, temp;
>
>         if (size < 100)
>                 return -ENOSPC;
> @@ -98,9 +102,13 @@ int cpu_imx_get_desc(struct udevice *dev, char *buf, int size)
>                        plat->type, plat->rev, plat->name, plat->freq_mhz);
>
>         if (IS_ENABLED(CONFIG_IMX_SCU_THERMAL)) {
> +               temp = cpu_imx_get_temp(plat);
>                 buf = buf + ret;
>                 size = size - ret;
> -               ret = snprintf(buf, size, " at %dC", cpu_imx_get_temp());
> +               if (temp != 0xdeadbeef)
> +                       ret = snprintf(buf, size, " at %dC", temp);
> +               else
> +                       ret = snprintf(buf, size, " - invalid sensor data");
>         }
>
>         snprintf(buf + ret, size - ret, "\n");
> --
> 2.16.4
>

Regards,
Simon