Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757233AbcC2PCP (ORCPT ); Tue, 29 Mar 2016 11:02:15 -0400 Received: from mail-wm0-f44.google.com ([74.125.82.44]:37835 "EHLO mail-wm0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752701AbcC2PCM (ORCPT ); Tue, 29 Mar 2016 11:02:12 -0400 Subject: Re: [PATCH 01/12] ARM: dts: apq8064: fix the pinctrls for i2c and spi To: Bjorn Andersson References: <1458762366-9233-1-git-send-email-srinivas.kandagatla@linaro.org> <1458762421-9339-1-git-send-email-srinivas.kandagatla@linaro.org> <20160329142807.GF8929@tuxbot> Cc: Andy Gross , linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-soc@vger.kernel.org From: Srinivas Kandagatla Message-ID: <56FA98F0.2000300@linaro.org> Date: Tue, 29 Mar 2016 16:02:08 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0 MIME-Version: 1.0 In-Reply-To: <20160329142807.GF8929@tuxbot> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3833 Lines: 106 On 29/03/16 15:28, Bjorn Andersson wrote: > On Wed 23 Mar 12:47 PDT 2016, Srinivas Kandagatla wrote: > >> This patch fixes pinctrls for spi and i2c nodes whose default and sleep >> states are together, which is incorrect. >> >> Without this patch i2c/spi would not be functional. >> >> Signed-off-by: Srinivas Kandagatla > > The change in itself is sound, but I don't understand why i2c/spi fails > to function if we don't bring them to a sleep state. Can you please > update the commit message with an explanation? Yes, with the existing code the device would endup configuring the default pinstate to sleep pinconf. So the i2c bus would not be functional. If you try mainline on any 8064 based boards you would easily reproduce the bug. For example read the eeprom on IFC6410. > > > PS. Whenever there's multiple states for a thing I do prefer prefixing > them _a and _s to highlight that difference (not only suffixing the > sleep state). And use abbreviations :) If I search for _sleep in dts folder these are widely used, am not sure which is the prefered way to do this, as long as its readable by user am ok to do it either way. > > Regards, > Bjorn > >> --- >> arch/arm/boot/dts/qcom-apq8064.dtsi | 18 ++++++++++++------ >> 1 file changed, 12 insertions(+), 6 deletions(-) >> >> diff --git a/arch/arm/boot/dts/qcom-apq8064.dtsi b/arch/arm/boot/dts/qcom-apq8064.dtsi >> index 65d0e8d..c6ff8fc 100644 >> --- a/arch/arm/boot/dts/qcom-apq8064.dtsi >> +++ b/arch/arm/boot/dts/qcom-apq8064.dtsi >> @@ -227,7 +227,8 @@ >> >> gsbi1_i2c: i2c@12460000 { >> compatible = "qcom,i2c-qup-v1.1.1"; >> - pinctrl-0 = <&i2c1_pins &i2c1_pins_sleep>; >> + pinctrl-0 = <&i2c1_pins>; >> + pinctrl-1 = <&i2c1_pins_sleep>; >> pinctrl-names = "default", "sleep"; >> reg = <0x12460000 0x1000>; >> interrupts = <0 194 IRQ_TYPE_NONE>; >> @@ -255,7 +256,8 @@ >> gsbi2_i2c: i2c@124a0000 { >> compatible = "qcom,i2c-qup-v1.1.1"; >> reg = <0x124a0000 0x1000>; >> - pinctrl-0 = <&i2c2_pins &i2c2_pins_sleep>; >> + pinctrl-0 = <&i2c2_pins>; >> + pinctrl-1 = <&i2c2_pins_sleep>; >> pinctrl-names = "default", "sleep"; >> interrupts = <0 196 IRQ_TYPE_NONE>; >> clocks = <&gcc GSBI2_QUP_CLK>, <&gcc GSBI2_H_CLK>; >> @@ -277,7 +279,8 @@ >> ranges; >> gsbi3_i2c: i2c@16280000 { >> compatible = "qcom,i2c-qup-v1.1.1"; >> - pinctrl-0 = <&i2c3_pins &i2c3_pins_sleep>; >> + pinctrl-0 = <&i2c3_pins>; >> + pinctrl-1 = <&i2c3_pins_sleep>; >> pinctrl-names = "default", "sleep"; >> reg = <0x16280000 0x1000>; >> interrupts = ; >> @@ -302,7 +305,8 @@ >> >> gsbi4_i2c: i2c@16380000 { >> compatible = "qcom,i2c-qup-v1.1.1"; >> - pinctrl-0 = <&i2c4_pins &i2c4_pins_sleep>; >> + pinctrl-0 = <&i2c4_pins>; >> + pinctrl-1 = <&i2c4_pins_sleep>; >> pinctrl-names = "default", "sleep"; >> reg = <0x16380000 0x1000>; >> interrupts = ; >> @@ -337,7 +341,8 @@ >> compatible = "qcom,spi-qup-v1.1.1"; >> reg = <0x1a280000 0x1000>; >> interrupts = <0 155 0>; >> - pinctrl-0 = <&spi5_default &spi5_sleep>; >> + pinctrl-0 = <&spi5_default>; >> + pinctrl-1 = <&spi5_sleep>; >> pinctrl-names = "default", "sleep"; >> clocks = <&gcc GSBI5_QUP_CLK>, <&gcc GSBI5_H_CLK>; >> clock-names = "core", "iface"; >> @@ -370,7 +375,8 @@ >> >> gsbi6_i2c: i2c@16580000 { >> compatible = "qcom,i2c-qup-v1.1.1"; >> - pinctrl-0 = <&i2c6_pins &i2c6_pins_sleep>; >> + pinctrl-0 = <&i2c6_pins>; >> + pinctrl-1 = <&i2c6_pins_sleep>; >> pinctrl-names = "default", "sleep"; >> reg = <0x16580000 0x1000>; >> interrupts = ; >> -- >> 2.5.0 >>