linux-kernel - [PATCH] ARM: dts: NSP: Use hardware I2C for BCM958625HR

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Date:   Fri, 13 Dec 2019 11:51:02 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        bcm-kernel-feedback-list@...adcom.com (maintainer:BROADCOM IPROC ARM
        ARCHITECTURE),
        devicetree@...r.kernel.org (open list:OPEN FIRMWARE AND FLATTENED
        DEVICE TREE BINDINGS), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] ARM: dts: NSP: Use hardware I2C for BCM958625HR

Now that the i2c-bcm-iproc driver has been fixed to permit reading more
than 63 bytes in a single transaction with commit fd01eecdf959 ("i2c:
iproc: Fix i2c master read more than 63 bytes") we no longer need to
bitbang i2c over GPIOs which was necessary before to allow the
PHYLINK/SFP subsystems to read SFP modules.

Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
---
 arch/arm/boot/dts/bcm958625hr.dts | 15 +++++----------
 1 file changed, 5 insertions(+), 10 deletions(-)

diff --git a/arch/arm/boot/dts/bcm958625hr.dts b/arch/arm/boot/dts/bcm958625hr.dts
index a2c9de35ddfb..536fb24f38bb 100644
--- a/arch/arm/boot/dts/bcm958625hr.dts
+++ b/arch/arm/boot/dts/bcm958625hr.dts
@@ -55,18 +55,9 @@
 		priority = <200>;
 	};
 
-	/* Hardware I2C block cannot do more than 63 bytes per transfer,
-	 * which would prevent reading from a SFP's EEPROM (256 byte).
-	 */
-	i2c1: i2c {
-		compatible = "i2c-gpio";
-		sda-gpios = <&gpioa 5 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
-		scl-gpios = <&gpioa 4 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
-	};
-
 	sfp: sfp {
 		compatible = "sff,sfp";
-		i2c-bus = <&i2c1>;
+		i2c-bus = <&i2c0>;
 		mod-def0-gpios = <&gpioa 28 GPIO_ACTIVE_LOW>;
 		los-gpios = <&gpioa 24 GPIO_ACTIVE_HIGH>;
 		tx-fault-gpios = <&gpioa 30 GPIO_ACTIVE_HIGH>;
@@ -74,6 +65,10 @@
 	};
 };
 
+&i2c0 {
+	status = "okay";
+};
+
 &amac0 {
 	status = "okay";
 };
-- 
2.17.1