linux-kernel - [PATCH] arm: dts: am33xx: Add spi alias to match SOC schematics

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Message-Id: <1503399453-4946-1-git-send-email-sunil.m@techveda.org>
Date:   Tue, 22 Aug 2017 16:27:33 +0530
From:   sunil.m@...hveda.org
To:     bcousson@...libre.com, tony@...mide.com, robh+dt@...nel.org,
        mark.rutland@....com, linux@...linux.org.uk
Cc:     karthik@...hveda.org, linux-omap@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Suniel Mahesh <sunil.m@...hveda.org>
Subject: [PATCH] arm: dts: am33xx: Add spi alias to match SOC schematics

From: Suniel Mahesh <sunil.m@...hveda.org>

Linux bus numbers should match the numbers defined by the chip
manufacturer. This patch add's spi aliases to acheive that bus
naming convention.

Signed-off-by: Suniel Mahesh <sunil.m@...hveda.org>
Signed-off-by: Karthik Tummala <karthik@...hveda.org>
Tested-by: Karthik Tummala <karthik@...hveda.org>
---
Note:
- Patch was compile tested and built(ARCH=arm) on next-20170822.
- Patch was hardware tested on AM335x (McSPI controller) with
  spi flash chips.
- No build/run-time issues reported.
- At present bus numbers are represented as spi1 and spi2 in sysfs
  instead of spi0 and spi1, as defined in SOC schematics.
- The commit:
"spi: Pick spi bus number from Linux idr or spi alias"
(SHA1:9b61e302210eba55768962f2f11e96bb508c2408)
has introduced bus numbering which happens dynamically either
via Linux IDR or spi alias for master drivers.
- The commit:
"spi: omap: Allocate bus number from spi framework"
(SHA1:b590782afe0a99fca84f451252ed7e2d64b2f155)
is now using spi framework to allocate bus numbers.
---
 arch/arm/boot/dts/am33xx.dtsi | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm/boot/dts/am33xx.dtsi b/arch/arm/boot/dts/am33xx.dtsi
index 7d7ca05..e58fab8 100644
--- a/arch/arm/boot/dts/am33xx.dtsi
+++ b/arch/arm/boot/dts/am33xx.dtsi
@@ -36,6 +36,8 @@
 		phy1 = &usb1_phy;
 		ethernet0 = &cpsw_emac0;
 		ethernet1 = &cpsw_emac1;
+		spi0 = &spi0;
+		spi1 = &spi1;
 	};
 
 	cpus {
-- 
1.9.1