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nvmem: add i.MX7 support to snvs-lpgpr 

The i.MX7 family has similar SNVS hardware so make the snvs-lpgpr
support it along with the i.MX6 family. The register interface is the
same except for the number and offset of the general purpose registers.

Signed-off-by: Andrey Yurovsky <yurovsky@gmail.com>
Reviewed-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andrey Yurovsky 2018-03-09 14:47:16 +00:00 committed by Greg Kroah-Hartman
parent b7743a9944
commit 80b820cae4
3 changed files with 25 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
Documentation/devicetree/bindings/nvmem/snvs-lpgpr.txt
View File

@ -1,5 +1,5 @@
Device tree bindings for Low Power General Purpose Register found in i.MX6Q/D
Secure Non-Volatile Storage.
and i.MX7 Secure Non-Volatile Storage.
This DT node should be represented as a sub-node of a "syscon",
"simple-mfd" node.
@ -8,6 +8,7 @@ Required properties:
- compatible: should be one of the fallowing variants:
"fsl,imx6q-snvs-lpgpr" for Freescale i.MX6Q/D/DL/S
"fsl,imx6ul-snvs-lpgpr" for Freescale i.MX6UL
"fsl,imx7d-snvs-lpgpr" for Freescale i.MX7D/S
Example:
snvs: snvs@020cc000 {

4
drivers/nvmem/Kconfig
View File

@ -167,10 +167,10 @@ config MESON_MX_EFUSE
config NVMEM_SNVS_LPGPR
tristate "Support for Low Power General Purpose Register"
depends on SOC_IMX6 || COMPILE_TEST
depends on SOC_IMX6 || SOC_IMX7D || COMPILE_TEST
help
This is a driver for Low Power General Purpose Register (LPGPR) available on
i.MX6 SoCs in Secure Non-Volatile Storage (SNVS) of this chip.
i.MX6 and i.MX7 SoCs in Secure Non-Volatile Storage (SNVS) of this chip.
This driver can also be built as a module. If so, the module
will be called nvmem-snvs-lpgpr.

27
drivers/nvmem/snvs_lpgpr.c
View File

@ -14,15 +14,21 @@
#include <linux/regmap.h>
#define IMX6Q_SNVS_HPLR 0x00
#define IMX6Q_GPR_SL BIT(5)
#define IMX6Q_SNVS_LPLR 0x34
#define IMX6Q_GPR_HL BIT(5)
#define IMX6Q_SNVS_LPGPR 0x68
#define IMX7D_SNVS_HPLR 0x00
#define IMX7D_SNVS_LPLR 0x34
#define IMX7D_SNVS_LPGPR 0x90
#define IMX_GPR_SL BIT(5)
#define IMX_GPR_HL BIT(5)
struct snvs_lpgpr_cfg {
int offset;
int offset_hplr;
int offset_lplr;
int size;
};
struct snvs_lpgpr_priv {
@ -36,6 +42,14 @@ static const struct snvs_lpgpr_cfg snvs_lpgpr_cfg_imx6q = {
.offset = IMX6Q_SNVS_LPGPR,
.offset_hplr = IMX6Q_SNVS_HPLR,
.offset_lplr = IMX6Q_SNVS_LPLR,
.size = 4,
};
static const struct snvs_lpgpr_cfg snvs_lpgpr_cfg_imx7d = {
.offset = IMX7D_SNVS_LPGPR,
.offset_hplr = IMX7D_SNVS_HPLR,
.offset_lplr = IMX7D_SNVS_LPLR,
.size = 16,
};
static int snvs_lpgpr_write(void *context, unsigned int offset, void *val,
@ -50,14 +64,14 @@ static int snvs_lpgpr_write(void *context, unsigned int offset, void *val,
if (ret < 0)
return ret;
if (lock_reg & IMX6Q_GPR_SL)
if (lock_reg & IMX_GPR_SL)
return -EPERM;
ret = regmap_read(priv->regmap, dcfg->offset_lplr, &lock_reg);
if (ret < 0)
return ret;
if (lock_reg & IMX6Q_GPR_HL)
if (lock_reg & IMX_GPR_HL)
return -EPERM;
return regmap_bulk_write(priv->regmap, dcfg->offset + offset, val,
@ -112,7 +126,7 @@ static int snvs_lpgpr_probe(struct platform_device *pdev)
cfg->dev = dev;
cfg->stride = 4;
cfg->word_size = 4;
cfg->size = 4;
cfg->size = dcfg->size,
cfg->owner = THIS_MODULE;
cfg->reg_read = snvs_lpgpr_read;
cfg->reg_write = snvs_lpgpr_write;
@ -126,6 +140,7 @@ static const struct of_device_id snvs_lpgpr_dt_ids[] = {
{ .compatible = "fsl,imx6q-snvs-lpgpr", .data = &snvs_lpgpr_cfg_imx6q },
{ .compatible = "fsl,imx6ul-snvs-lpgpr",
.data = &snvs_lpgpr_cfg_imx6q },
{ .compatible = "fsl,imx7d-snvs-lpgpr", .data = &snvs_lpgpr_cfg_imx7d },
{ },
};
MODULE_DEVICE_TABLE(of, snvs_lpgpr_dt_ids);
@ -140,5 +155,5 @@ static struct platform_driver snvs_lpgpr_driver = {
module_platform_driver(snvs_lpgpr_driver);
MODULE_AUTHOR("Oleksij Rempel <o.rempel@pengutronix.de>");
MODULE_DESCRIPTION("Low Power General Purpose Register in i.MX6 Secure Non-Volatile Storage");
MODULE_DESCRIPTION("Low Power General Purpose Register in i.MX6 and i.MX7 Secure Non-Volatile Storage");
MODULE_LICENSE("GPL v2");