From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-de.keymile.com (mail-de.keymile.com [195.8.104.250]) (using TLSv1.1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 117731A0382 for ; Fri, 17 Oct 2014 20:33:07 +1100 (AEDT) From: Valentin Longchamp To: Linux PowerPC Kernel , Linux device trees , Linux I2C , Scott Wood Subject: [PATCH] i2c-qoriq: modified compatibility for correct prescaler Date: Fri, 17 Oct 2014 11:27:06 +0200 Message-Id: <1413538026-15739-1-git-send-email-valentin.longchamp@keymile.com> Cc: Rainer Boschung , Valentin Longchamp , Holger Brunck List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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 Signed-off-by: Valentin Longchamp --- 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