Messages in this thread Patch in this message | | | From | Esteban Blanc <> | Date | Thu, 27 Jul 2023 11:04:35 +0200 | Subject | [PATCH] 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: 875fdd0787e4 ("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> --- drivers/misc/tps6594-esm.c | 19 ++++++++++++++++++- 1 file changed, 18 insertions(+), 1 deletion(-)
diff --git a/drivers/misc/tps6594-esm.c b/drivers/misc/tps6594-esm.c index b488f704f104..05e2c151e632 100644 --- a/drivers/misc/tps6594-esm.c +++ b/drivers/misc/tps6594-esm.c @@ -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", --- base-commit: 554ae3bee71e60e7278136f452da9a17c036bdcb change-id: 20230726-tps6594_fix_esm_for_v1-3f561d9e0884 Best regards, -- Esteban Blanc <eblanc@baylibre.com>
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