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Date: Wed, 12 Jul 2017 14:36:31 +0800
From: Shawn Guo <shawnguo@...nel.org>
To: Leonard Crestez <leonard.crestez@....com>
Cc: Zhang Rui <rui.zhang@...el.com>,
Eduardo Valentin <edubezval@...il.com>,
Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Lothar Waßmann <LW@...O-electronics.de>,
Fabio Estevam <fabio.estevam@....com>,
Dong Aisheng <aisheng.dong@....com>,
Bai Ping <ping.bai@....com>, Anson Huang <Anson.Huang@....com>,
Octavian Purdila <octavian.purdila@....com>,
linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] thermal: imx: Add support for reading OCOTP through
nvmem
On Thu, Jul 06, 2017 at 04:20:42PM +0300, Leonard Crestez wrote:
> On newer imx SOCs accessing OCOTP directly is wrong because the ocotp clock
> needs to be enabled first. Add support for reading those same values through
> the nvmem API instead.
>
> The older path is preserved for compatibility with older dts and because it
> works correctly on imx6qdl chips.
>
> Signed-off-by: Leonard Crestez <leonard.crestez@....com>
> ---
> drivers/thermal/imx_thermal.c | 131 ++++++++++++++++++++++++++++++++----------
> 1 file changed, 101 insertions(+), 30 deletions(-)
>
> diff --git a/drivers/thermal/imx_thermal.c b/drivers/thermal/imx_thermal.c
> index fb648a4..ffbd579 100644
> --- a/drivers/thermal/imx_thermal.c
> +++ b/drivers/thermal/imx_thermal.c
> @@ -24,6 +24,7 @@
> #include <linux/slab.h>
> #include <linux/thermal.h>
> #include <linux/types.h>
> +#include <linux/nvmem-consumer.h>
>
> #define REG_SET 0x4
> #define REG_CLR 0x8
> @@ -92,7 +93,7 @@ struct imx_thermal_data {
> struct thermal_cooling_device *cdev;
> enum thermal_device_mode mode;
> struct regmap *tempmon;
> - u32 c1, c2; /* See formula in imx_get_sensor_data() */
> + u32 c1, c2; /* See formula in imx_init_calib() */
> int temp_passive;
> int temp_critical;
> int temp_max;
> @@ -175,7 +176,7 @@ static int imx_get_temp(struct thermal_zone_device *tz, int *temp)
>
> n_meas = (val & TEMPSENSE0_TEMP_CNT_MASK) >> TEMPSENSE0_TEMP_CNT_SHIFT;
>
> - /* See imx_get_sensor_data() for formula derivation */
> + /* See imx_init_calib() for formula derivation */
> *temp = data->c2 - n_meas * data->c1;
>
> /* Update alarm value to next higher trip point for TEMPMON_IMX6Q */
> @@ -344,29 +345,12 @@ static struct thermal_zone_device_ops imx_tz_ops = {
> .set_trip_temp = imx_set_trip_temp,
> };
>
> -static int imx_get_sensor_data(struct platform_device *pdev)
> +static int imx_init_calib(struct platform_device *pdev, u32 val)
> {
> struct imx_thermal_data *data = platform_get_drvdata(pdev);
> - struct regmap *map;
> int t1, n1;
> - int ret;
> - u32 val;
> u64 temp64;
>
> - map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
> - "fsl,tempmon-data");
> - if (IS_ERR(map)) {
> - ret = PTR_ERR(map);
> - dev_err(&pdev->dev, "failed to get sensor regmap: %d\n", ret);
> - return ret;
> - }
> -
> - ret = regmap_read(map, OCOTP_ANA1, &val);
> - if (ret) {
> - dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret);
> - return ret;
> - }
> -
> if (val == 0 || val == ~0) {
> dev_err(&pdev->dev, "invalid sensor calibration data\n");
> return -EINVAL;
> @@ -403,12 +387,12 @@ static int imx_get_sensor_data(struct platform_device *pdev)
> data->c1 = temp64;
> data->c2 = n1 * data->c1 + 1000 * t1;
>
> - /* use OTP for thermal grade */
> - ret = regmap_read(map, OCOTP_MEM0, &val);
> - if (ret) {
> - dev_err(&pdev->dev, "failed to read temp grade: %d\n", ret);
> - return ret;
> - }
> + return 0;
> +}
> +
> +static void imx_init_temp_grade(struct platform_device *pdev, u32 val)
> +{
> + struct imx_thermal_data *data = platform_get_drvdata(pdev);
>
> /* The maximum die temp is specified by the Temperature Grade */
> switch ((val >> 6) & 0x3) {
> @@ -436,10 +420,87 @@ static int imx_get_sensor_data(struct platform_device *pdev)
> */
> data->temp_critical = data->temp_max - (1000 * 5);
> data->temp_passive = data->temp_max - (1000 * 10);
> +}
> +
> +static int imx_init_from_tempmon_data(struct platform_device *pdev)
> +{
> + struct regmap *map;
> + int ret;
> + u32 val;
> +
> + map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
> + "fsl,tempmon-data");
> + if (IS_ERR(map)) {
> + ret = PTR_ERR(map);
> + dev_err(&pdev->dev, "failed to get sensor regmap: %d\n", ret);
> + return ret;
> + }
> +
> + ret = regmap_read(map, OCOTP_ANA1, &val);
> + if (ret) {
> + dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret);
> + return ret;
> + }
> + ret = imx_init_calib(pdev, val);
> + if (ret)
> + return ret;
> +
> + ret = regmap_read(map, OCOTP_MEM0, &val);
> + if (ret) {
> + dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret);
> + return ret;
> + }
> + imx_init_temp_grade(pdev, val);
>
> return 0;
> }
>
> +static int nvmem_cell_read_u32(struct device* dev, const char *cell_id, u32 *val)
> +{
> + struct nvmem_cell *cell;
> + void *buf;
> + size_t len;
> +
> + cell = nvmem_cell_get(dev, cell_id);
> + if (IS_ERR(cell))
> + return PTR_ERR(cell);
> +
> + buf = nvmem_cell_read(cell, &len);
> + if (IS_ERR(buf)) {
> + nvmem_cell_put(cell);
> + return PTR_ERR(buf);
> + }
> + if (len != sizeof(*val)) {
> + kfree(buf);
> + nvmem_cell_put(cell);
> + return -EINVAL;
> + }
> + memcpy(val, buf, sizeof(*val));
> +
> + kfree(buf);
> + nvmem_cell_put(cell);
> + return 0;
> +}
The function looks nothing IMX specific, and could be a nvmem core
function?
@Srinivas, thoughts?
Shawn
> +
> +static int imx_init_from_nvmem_cells(struct platform_device *pdev)
> +{
> + int ret;
> + u32 val;
> +
> + ret = nvmem_cell_read_u32(&pdev->dev, "calib", &val);
> + if (ret)
> + return ret;
> + imx_init_calib(pdev, val);
> +
> + ret = nvmem_cell_read_u32(&pdev->dev, "temp_grade", &val);
> + if (ret)
> + return ret;
> + imx_init_temp_grade(pdev, val);
> +
> + return 0;
> +}
> +
> +
> static irqreturn_t imx_thermal_alarm_irq(int irq, void *dev)
> {
> struct imx_thermal_data *data = dev;
> @@ -512,10 +573,20 @@ static int imx_thermal_probe(struct platform_device *pdev)
>
> platform_set_drvdata(pdev, data);
>
> - ret = imx_get_sensor_data(pdev);
> - if (ret) {
> - dev_err(&pdev->dev, "failed to get sensor data\n");
> - return ret;
> + if (of_find_property(pdev->dev.of_node, "nvmem-cells", NULL)) {
> + ret = imx_init_from_nvmem_cells(pdev);
> + if (ret == -EPROBE_DEFER)
> + return ret;
> + if (ret) {
> + dev_err(&pdev->dev, "failed to init from nvmem: %d\n", ret);
> + return ret;
> + }
> + } else {
> + ret = imx_init_from_tempmon_data(pdev);
> + if (ret) {
> + dev_err(&pdev->dev, "failed to init from from fsl,tempmon-data\n");
> + return ret;
> + }
> }
>
> /* Make sure sensor is in known good state for measurements */
> --
> 2.7.4
>
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