linux-kernel - [PATCH 3/3] ARM: da850: Add ti,da830-uart compatible for serial ports

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Message-Id: <1482265384-715-4-git-send-email-david@lechnology.com>
Date:   Tue, 20 Dec 2016 14:23:04 -0600
From:   David Lechner <david@...hnology.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Cc:     David Lechner <david@...hnology.com>, Sekhar Nori <nsekhar@...com>,
        Kevin Hilman <khilman@...nel.org>,
        Axel Haslam <ahaslam@...libre.com>,
        Alexandre Bailon <abailon@...libre.com>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Jiri Slaby <jslaby@...e.com>, linux-serial@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH 3/3] ARM: da850: Add ti,da830-uart compatible for serial ports

TI DA8xx/OMAPL13x/AM17xx/AM18xx SoCs have extra UART registers beyond
the standard 8250 registers, so we need a new compatible string to
indicate this. Also, at least one of these registers uses the full 32
bits, so we need to specify reg-io-width in addition to reg-shift.

"ns16550a" is left in the compatible specification since it does work
as long as the bootloader configures the SoC UART power management
registers.

Signed-off-by: David Lechner <david@...hnology.com>
---
 arch/arm/boot/dts/da850.dtsi | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/arch/arm/boot/dts/da850.dtsi b/arch/arm/boot/dts/da850.dtsi
index 104155d..f6cd212 100644
--- a/arch/arm/boot/dts/da850.dtsi
+++ b/arch/arm/boot/dts/da850.dtsi
@@ -266,22 +266,25 @@
 			interrupt-names = "edm3_tcerrint";
 		};
 		serial0: serial@...00 {
-			compatible = "ns16550a";
+			compatible = "ti,da830-uart", "ns16550a";
 			reg = <0x42000 0x100>;
+			reg-io-width = <4>;
 			reg-shift = <2>;
 			interrupts = <25>;
 			status = "disabled";
 		};
 		serial1: serial@...000 {
-			compatible = "ns16550a";
+			compatible = "ti,da830-uart", "ns16550a";
 			reg = <0x10c000 0x100>;
+			reg-io-width = <4>;
 			reg-shift = <2>;
 			interrupts = <53>;
 			status = "disabled";
 		};
 		serial2: serial@...000 {
-			compatible = "ns16550a";
+			compatible = "ti,da830-uart", "ns16550a";
 			reg = <0x10d000 0x100>;
+			reg-io-width = <4>;
 			reg-shift = <2>;
 			interrupts = <61>;
 			status = "disabled";
-- 
2.7.4