openwrt/target/linux/generic/backport-6.6/816-v6.7-0001-nvmem-qfprom-Mark-core-clk-as-optional.patch

From 16724d6ea40a2c9315f5a0d81005dfa4d7a6da24 Mon Sep 17 00:00:00 2001
From: Luca Weiss <luca.weiss@fairphone.com>
Date: Fri, 20 Oct 2023 11:55:40 +0100
Subject: [PATCH] nvmem: qfprom: Mark core clk as optional

On some platforms like sc7280 on non-ChromeOS devices the core clock
cannot be touched by Linux so we cannot provide it. Mark it as optional
as accessing qfprom for reading works without it but we still prohibit
writing if we cannot provide the clock.

Signed-off-by: Luca Weiss <luca.weiss@fairphone.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20231020105545.216052-2-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/nvmem/qfprom.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/drivers/nvmem/qfprom.c
+++ b/drivers/nvmem/qfprom.c
@@ -424,12 +424,12 @@ static int qfprom_probe(struct platform_
 		if (IS_ERR(priv->vcc))
 			return PTR_ERR(priv->vcc);
 
-		priv->secclk = devm_clk_get(dev, "core");
+		priv->secclk = devm_clk_get_optional(dev, "core");
 		if (IS_ERR(priv->secclk))
 			return dev_err_probe(dev, PTR_ERR(priv->secclk), "Error getting clock\n");
 
-		/* Only enable writing if we have SoC data. */
-		if (priv->soc_data)
+		/* Only enable writing if we have SoC data and a valid clock */
+		if (priv->soc_data && priv->secclk)
 			econfig.reg_write = qfprom_reg_write;
 	}