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From: "Paweł Anikiel" <pan@semihalf.com>
To: jarkko.nikula@linux.intel.com, andriy.shevchenko@linux.intel.com,
	mika.westerberg@linux.intel.com, robh+dt@kernel.org,
	p.zabel@pengutronix.de, arnd@arndb.de, olof@lixom.net,
	soc@kernel.org, dinguyen@kernel.org, p.yadav@ti.com,
	Tudor.Ambarus@microchip.com
Cc: linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org,
	alexandre.belloni@bootlin.com, sre@kernel.org,
	thunder.leizhen@huawei.com, Jonathan.Cameron@huawei.com,
	devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	ka@semihalf.com, tn@semihalf.com, jam@semihalf.com,
	amstan@google.com, "Paweł Anikiel" <pan@semihalf.com>
Subject: [PATCH v2 1/4] i2c: check bus number property in DesignWare I2C Controller
Date: Tue,  5 Oct 2021 16:37:45 +0200	[thread overview]
Message-ID: <20211005143748.2471647-2-pan@semihalf.com> (raw)
In-Reply-To: <20211005143748.2471647-1-pan@semihalf.com>

On SoCFPGA systems, it's desireable to have fixed numbering for
i2c busses, while being able to enable/disable them (e.g. have i2c1
be mapped to /dev/i2c-1, even though i2c0 is disabled). This can also
be achieved using devicetree aliases (see i2c_add_adapter). However,
having the driver be self-contained without relying on aliases is more
robust.

Signed-off-by: Paweł Anikiel <pan@semihalf.com>
---
 drivers/i2c/busses/i2c-designware-platdrv.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c
index 21113665ddea..f27e6bc9ad9d 100644
--- a/drivers/i2c/busses/i2c-designware-platdrv.c
+++ b/drivers/i2c/busses/i2c-designware-platdrv.c
@@ -280,7 +280,8 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)
 					I2C_CLASS_HWMON : I2C_CLASS_DEPRECATED;
 	ACPI_COMPANION_SET(&adap->dev, ACPI_COMPANION(&pdev->dev));
 	adap->dev.of_node = pdev->dev.of_node;
-	adap->nr = -1;
+	if (of_property_read_u32(pdev->dev.of_node, "busno", &adap->nr))
+		adap->nr = -1;
 
 	if (dev->flags & ACCESS_NO_IRQ_SUSPEND) {
 		dev_pm_set_driver_flags(&pdev->dev,
-- 
2.25.1


  reply	other threads:[~2021-10-05 14:38 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-05 14:37 [PATCH v2 0/4] Add support for the Mercury+ AA1 module Paweł Anikiel
2021-10-05 14:37 ` Paweł Anikiel [this message]
2021-10-05 16:19   ` [PATCH v2 1/4] i2c: check bus number property in DesignWare I2C Controller Andy Shevchenko
2021-10-05 14:37 ` [PATCH v2 2/4] dt-bindings: add bus number property Paweł Anikiel
2021-10-05 16:22   ` Arnd Bergmann
2021-10-05 16:28     ` Alexandre Belloni
2021-10-06  9:29       ` Paweł Anikiel
     [not found]       ` <CAF9_jYT6mbk6dr8=ZYZ8B=gxnuHas7QBfDfuoTJnMzSKZt=WGw@mail.gmail.com>
2021-10-06  9:41         ` Arnd Bergmann
2021-10-05 14:37 ` [PATCH v2 3/4] reset: socfpga: add empty driver allowing consumers to probe Paweł Anikiel
2021-10-05 14:37 ` [PATCH v2 4/4] dts: socfpga: Add Mercury+ AA1 devicetree Paweł Anikiel
     [not found] ` <20211005143746.xE5rCkt-P_XlNkn9bJ8ZqYPY4nQQ7doqzSd4FrAlICY@z>
2021-10-14 16:46   ` [PATCH v2 2/4] dt-bindings: add bus number property Rob Herring

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