From: Elena Popa <elena.popa@nxp.com>
Date: Fri, 30 May 2025 10:40:00 +0000 (+0300)
Subject: rtc: pcf2127: fix SPI command byte for PCF2131
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=fa78e9b606a472495ef5b6b3d8b45c37f7727f9d;p=thirdparty%2Flinux.git

rtc: pcf2127: fix SPI command byte for PCF2131

PCF2131 was not responding to read/write operations using SPI. PCF2131
has a different command byte definition, compared to PCF2127/29. Added
the new command byte definition when PCF2131 is detected.

Fixes: afc505bf9039 ("rtc: pcf2127: add support for PCF2131 RTC")
Cc: stable@vger.kernel.org
Signed-off-by: Elena Popa <elena.popa@nxp.com>
Acked-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>
Link: https://lore.kernel.org/r/20250530104001.957977-1-elena.popa@nxp.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
---

diff --git a/drivers/rtc/rtc-pcf2127.c b/drivers/rtc/rtc-pcf2127.c
index 31c7dca8f469..2c7917bc2a31 100644
--- a/drivers/rtc/rtc-pcf2127.c
+++ b/drivers/rtc/rtc-pcf2127.c
@@ -1538,6 +1538,11 @@ static int pcf2127_spi_probe(struct spi_device *spi)
 		variant = &pcf21xx_cfg[type];
 	}
 
+	if (variant->type == PCF2131) {
+		config.read_flag_mask = 0x0;
+		config.write_flag_mask = 0x0;
+	}
+
 	config.max_register = variant->max_register,
 
 	regmap = devm_regmap_init_spi(spi, &config);