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From: Piyush Malgujar <pmalgujar@marvell.com>
To: <andi.shyti@kernel.org>, <linux-i2c@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>
CC: <sgarapati@marvell.com>, <cchavva@marvell.com>, <jannadurai@marvell.com>,
        Piyush Malgujar <pmalgujar@marvell.com>
Subject: [PATCH v3 4/4] i2c: thunderx: Adding ioclk support
Date: Tue, 6 Feb 2024 03:43:49 -0800
Message-ID: <20240206114349.32197-5-pmalgujar@marvell.com>
In-Reply-To: <20240206114349.32197-1-pmalgujar@marvell.com>
References: <20240206114349.32197-1-pmalgujar@marvell.com>
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Adding support to use ioclk as reference clock if sclk not
present to make it SOC agnostic.
In case, it's not defined in dts/acpi table, use 800MHz as
default clock.

Signed-off-by: Piyush Malgujar <pmalgujar@marvell.com>
---
 drivers/i2c/busses/i2c-thunderx-pcidrv.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/drivers/i2c/busses/i2c-thunderx-pcidrv.c b/drivers/i2c/busses/i2c-thunderx-pcidrv.c
index 31f11b77ab663626967c86086a03213876bf4a07..15cf794a776533d1b0dbb08597fc0d9acf791b44 100644
--- a/drivers/i2c/busses/i2c-thunderx-pcidrv.c
+++ b/drivers/i2c/busses/i2c-thunderx-pcidrv.c
@@ -27,7 +27,7 @@
 
 #define PCI_DEVICE_ID_THUNDER_TWSI	0xa012
 
-#define SYS_FREQ_DEFAULT		700000000
+#define SYS_FREQ_DEFAULT		800000000
 #define OTX2_REF_FREQ_DEFAULT		100000000
 
 #define TWSI_INT_ENA_W1C		0x1028
@@ -100,7 +100,8 @@ static void thunder_i2c_clock_enable(struct device *dev, struct octeon_i2c *i2c)
 		i2c->sys_freq = clk_get_rate(i2c->clk);
 	} else {
 		/* ACPI */
-		device_property_read_u32(dev, "sclk", &i2c->sys_freq);
+		if (device_property_read_u32(dev, "sclk", &i2c->sys_freq))
+			device_property_read_u32(dev, "ioclk", &i2c->sys_freq);
 	}
 
 skip:
@@ -182,7 +183,6 @@ static int thunder_i2c_probe_pci(struct pci_dev *pdev,
 	if (!i2c->twsi_base)
 		return -EINVAL;
 
-	thunder_i2c_clock_enable(dev, i2c);
 	ret = device_property_read_u32(dev, "clock-frequency", &i2c->twsi_freq);
 	if (ret)
 		i2c->twsi_freq = I2C_MAX_STANDARD_MODE_FREQ;
@@ -196,12 +196,12 @@ static int thunder_i2c_probe_pci(struct pci_dev *pdev,
 
 	ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_MSIX);
 	if (ret < 0)
-		goto error;
+		return ret;
 
 	ret = devm_request_irq(dev, pci_irq_vector(pdev, 0), octeon_i2c_isr, 0,
 			       DRV_NAME, i2c);
 	if (ret)
-		goto error;
+		return ret;
 
 	ret = octeon_i2c_init_lowlevel(i2c);
 	if (ret)
@@ -213,6 +213,9 @@ static int thunder_i2c_probe_pci(struct pci_dev *pdev,
 	 */
 	if (octeon_i2c_is_otx2(pdev) && IS_LS_FREQ(i2c->twsi_freq))
 		i2c->sys_freq = OTX2_REF_FREQ_DEFAULT;
+	else
+		thunder_i2c_clock_enable(dev, i2c);
+
 	octeon_i2c_set_clock(i2c);
 
 	i2c->adap = thunderx_i2c_ops;
@@ -240,6 +243,8 @@ static int thunder_i2c_probe_pci(struct pci_dev *pdev,
 
 error:
 	thunder_i2c_clock_disable(dev, i2c->clk);
+	if (!IS_LS_FREQ(i2c->twsi_freq))
+		thunder_i2c_clock_disable(dev, i2c->clk);
 	return ret;
 }
 
-- 
2.42.0