linux-kernel - [PATCH v1 1/1] i2c: synquacer: Fix clock rate retrieval code

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Message-ID: <20240912144105.1555624-1-andy.shevchenko@gmail.com>
Date: Thu, 12 Sep 2024 17:41:05 +0300
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Ard Biesheuvel <ardb@...nel.org>,
	Andi Shyti <andi.shyti@...nel.org>,
	Christophe JAILLET <christophe.jaillet@...adoo.fr>,
	linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Andy Shevchenko <andy.shevchenko@...il.com>
Subject: [PATCH v1 1/1] i2c: synquacer: Fix clock rate retrieval code

With the devm_clk_get_enabled() the probe will fail on the systems
that have no clock provided, such as ACPI-based ones.

    synquacer_i2c SCX0003:00: error -ENOENT: failed to get and enable clock
    synquacer_i2c SCX0003:00: probe with driver synquacer_i2c failed with error -2

Fix this by switching to devm_clk_get_optional_enabled() in conjunction with NULL
check, so we won't overwrite the clock rate from the property.

Fixes: 55750148e559 ("i2c: synquacer: Fix an error handling path in synquacer_i2c_probe()")
Reported-by: Ard Biesheuvel <ardb@...nel.org>
Closes: https://lore.kernel.org/r/CAMj1kXFH+zB_YuUS+vaEpguhuVGLYbQw55VNDCxnBfSPe6b-nw@mail.gmail.com
Signed-off-by: Andy Shevchenko <andy.shevchenko@...il.com>
---
 drivers/i2c/busses/i2c-synquacer.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/i2c/busses/i2c-synquacer.c b/drivers/i2c/busses/i2c-synquacer.c
index 4eccbcd0fbfc..49d01fa8fb4e 100644
--- a/drivers/i2c/busses/i2c-synquacer.c
+++ b/drivers/i2c/busses/i2c-synquacer.c
@@ -550,12 +550,12 @@ static int synquacer_i2c_probe(struct platform_device *pdev)
 	device_property_read_u32(&pdev->dev, "socionext,pclk-rate",
 				 &i2c->pclkrate);
 
-	pclk = devm_clk_get_enabled(&pdev->dev, "pclk");
+	pclk = devm_clk_get_optional_enabled(&pdev->dev, "pclk");
 	if (IS_ERR(pclk))
 		return dev_err_probe(&pdev->dev, PTR_ERR(pclk),
 				     "failed to get and enable clock\n");
-
-	i2c->pclkrate = clk_get_rate(pclk);
+	if (pclk)
+		i2c->pclkrate = clk_get_rate(pclk);
 
 	if (i2c->pclkrate < SYNQUACER_I2C_MIN_CLK_RATE ||
 	    i2c->pclkrate > SYNQUACER_I2C_MAX_CLK_RATE)
-- 
2.46.0