linux-kernel - Re: [PATCH 01/12] ARM: dts: apq8064: fix the pinctrls for i2c and spi

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Message-ID: <20160329161045.GR8929@tuxbot>
Date:	Tue, 29 Mar 2016 09:10:45 -0700
From:	Bjorn Andersson <bjorn.andersson@...aro.org>
To:	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:	Andy Gross <andy.gross@...aro.org>, linux-arm-msm@...r.kernel.org,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-soc@...r.kernel.org
Subject: Re: [PATCH 01/12] ARM: dts: apq8064: fix the pinctrls for i2c and spi

On Tue 29 Mar 08:02 PDT 2016, Srinivas Kandagatla wrote:

> 
> 
> 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 <srinivas.kandagatla@...aro.org>
> >
> >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.
> 

Ohh sorry, not sure why I didn't see that. Your fix is obviously
correct.

Acked-by: Bjorn Andersson <bjorn.andersson@...aro.org>

Regards,
Bjorn

> 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@...60000 {
> >>  				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@...a0000 {
> >>  				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@...80000 {
> >>  				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 = <GIC_SPI 151 IRQ_TYPE_NONE>;
> >>@@ -302,7 +305,8 @@
> >>
> >>  			gsbi4_i2c: i2c@...80000 {
> >>  				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 = <GIC_SPI 153 IRQ_TYPE_NONE>;
> >>@@ -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@...80000 {
> >>  				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 = <GIC_SPI 157 IRQ_TYPE_NONE>;
> >>--
> >>2.5.0
> >>