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misc: tps6594-esm: Disable ESM for rev 1 PMIC

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Due to a silicon bug, ESM on TPS6594 PMIC revision 1 is not working
properly. This patch keeps SOC ESM disabled for such PMIC.

Fixes: 875fdd0787 ("misc: tps6594-esm: Add driver for TI TPS6594 ESM")
Co-developed-by: Julien Panis <jpanis@baylibre.com>
Signed-off-by: Julien Panis <jpanis@baylibre.com>
Signed-off-by: Esteban Blanc <eblanc@baylibre.com>
Link: https://lore.kernel.org/r/20230726-tps6594_fix_esm_for_v1-v1-1-2adfdcad31c2@baylibre.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Esteban Blanc 2023-07-27 11:04:35 +02:00 committed by Greg Kroah-Hartman
parent 101bd907b4
commit 77107b08f0
1 changed files with 18 additions and 1 deletions
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19
drivers/misc/tps6594-esm.c
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@ -13,6 +13,8 @@
#include <linux/mfd/tps6594.h>
#define TPS6594_DEV_REV_1 0x08
static irqreturn_t tps6594_esm_isr(int irq, void *dev_id)
{
struct platform_device *pdev = dev_id;
@ -32,11 +34,26 @@ static int tps6594_esm_probe(struct platform_device *pdev)
{
struct tps6594 *tps = dev_get_drvdata(pdev->dev.parent);
struct device *dev = &pdev->dev;
unsigned int rev;
int irq;
int ret;
int i;
for (i = 0 ; i < pdev->num_resources ; i++) {
/*
* Due to a bug in revision 1 of the PMIC, the GPIO3 used for the
* SoC ESM function is used to power the load switch instead.
* As a consequence, ESM can not be used on those PMIC.
* Check the version and return an error in case of revision 1.
*/
ret = regmap_read(tps->regmap, TPS6594_REG_DEV_REV, &rev);
if (ret)
return dev_err_probe(dev, ret,
"Failed to read PMIC revision\n");
if (rev == TPS6594_DEV_REV_1)
return dev_err_probe(dev, -ENODEV,
"ESM not supported for revision 1 PMIC\n");
for (i = 0; i < pdev->num_resources; i++) {
irq = platform_get_irq_byname(pdev, pdev->resource[i].name);
if (irq < 0)
return dev_err_probe(dev, irq, "Failed to get %s irq\n",