[PATCH] i2c-qoriq: modified compatibility for correct prescaler
From: Valentin Longchamp <hidden>
Date: 2014-10-17 09:27:06
Also in:
linux-i2c, linuxppc-dev
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Michael Ellerman, Linus Torvalds
With "fsl-i2c" compatibility the i2c frequency is not set correctly, because it sets no prescaler. According to the AN2919 from Freescale and the QorIQ (P2041) documentation, the source clock is 1/2 the platform clock. This implies that a prescaler of 2 must be used. This changes the compatibility of the qoriq-i2c .dtsi files to pick the mpc8543, which uses the same driver but sets the correct prescaler. Signed-off-by: Rainer Boschung <redacted> Signed-off-by: Valentin Longchamp <redacted> --- arch/powerpc/boot/dts/fsl/qoriq-i2c-0.dtsi | 4 ++-- arch/powerpc/boot/dts/fsl/qoriq-i2c-1.dtsi | 4 ++-- 2 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/arch/powerpc/boot/dts/fsl/qoriq-i2c-0.dtsi b/arch/powerpc/boot/dts/fsl/qoriq-i2c-0.dtsi
index 5f9bf7d..aa6c366 100644
--- a/arch/powerpc/boot/dts/fsl/qoriq-i2c-0.dtsi
+++ b/arch/powerpc/boot/dts/fsl/qoriq-i2c-0.dtsi@@ -36,7 +36,7 @@ i2c@118000 { #address-cells = <1>; #size-cells = <0>; cell-index = <0>; - compatible = "fsl-i2c"; + compatible = "fsl,mpc8543-i2c", "fsl-i2c"; reg = <0x118000 0x100>; interrupts = <38 2 0 0>; dfsrr;
@@ -46,7 +46,7 @@ i2c@118100 { #address-cells = <1>; #size-cells = <0>; cell-index = <1>; - compatible = "fsl-i2c"; + compatible = "fsl,mpc8543-i2c", "fsl-i2c"; reg = <0x118100 0x100>; interrupts = <38 2 0 0>; dfsrr;
diff --git a/arch/powerpc/boot/dts/fsl/qoriq-i2c-1.dtsi b/arch/powerpc/boot/dts/fsl/qoriq-i2c-1.dtsi
index 7989bf5..b697a3b 100644
--- a/arch/powerpc/boot/dts/fsl/qoriq-i2c-1.dtsi
+++ b/arch/powerpc/boot/dts/fsl/qoriq-i2c-1.dtsi@@ -36,7 +36,7 @@ i2c@119000 { #address-cells = <1>; #size-cells = <0>; cell-index = <2>; - compatible = "fsl-i2c"; + compatible = "fsl,mpc8543-i2c", "fsl-i2c"; reg = <0x119000 0x100>; interrupts = <39 2 0 0>; dfsrr;
@@ -46,7 +46,7 @@ i2c@119100 { #address-cells = <1>; #size-cells = <0>; cell-index = <3>; - compatible = "fsl-i2c"; + compatible = "fsl,mpc8543-i2c", "fsl-i2c"; reg = <0x119100 0x100>; interrupts = <39 2 0 0>; dfsrr;
--
1.8.0.1
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