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Date: Tue, 28 May 2013 14:32:37 +0200
From: Gabriel Fernandez <gabriel.fernandez.st@...il.com>
To: Lee Jones <lee.jones@...aro.org>
Cc: linux-kernel@...r.kernel.org,
Linus Walleij <linus.walleij@...aro.org>,
Olivier Clergeaud <olivier.clergeaud@...com>,
Gabriel Fernandez <gabriel.fernandez@...com>
Subject: Re: [PATCH 2/3] ARM: u8540: Add Pinctrl Device Tree settings for
uart0, uart2
On 28 May 2013 12:09, Lee Jones <lee.jones@...aro.org> wrote:
> On Mon, 27 May 2013, Gabriel Fernandez wrote:
>
>> From: Gabriel Fernandez <gabriel.fernandez@...com>
>>
>> This patch adds pinctrl device tree settings for uart0 and uart2
>> for ccu8540 board.
>>
>> Signed-off-by: Gabriel Fernandez <gabriel.fernandez@...com>
>> ---
>> arch/arm/boot/dts/ccu8540-pinctrl.dtsi | 77 ++++++++++++++++++++++++
>> arch/arm/boot/dts/ccu8540.dts | 7 +++
>> arch/arm/boot/dts/dbx5x0.dtsi | 2 +-
>> arch/arm/boot/dts/ste-nomadik-pinctrl.dtsi | 95 ++++++++++++++++++++++++++++++
>
> This is starting to get a bit confusing. How intrusive would it be to
> place the ccu8540-pinctrl information inside ccu8540.dts instead of
> breaking it out into different files and convoluting the issue?
>
> Also, please correct me if I'm wrong, but isn't what we call the
> Nomadik Pinctrl/GPIO really the same as DBX500 Pinctrl/GPIO? I wonder
> if this would be a better naming convention?
>
> Linus, what do you think?
>
>> include/dt-bindings/pinctrl/nomadik.h | 36 +++++++++++
>> 5 files changed, 216 insertions(+), 1 deletion(-)
>> create mode 100644 arch/arm/boot/dts/ccu8540-pinctrl.dtsi
>> create mode 100644 arch/arm/boot/dts/ste-nomadik-pinctrl.dtsi
>> create mode 100644 include/dt-bindings/pinctrl/nomadik.h
>>
>> diff --git a/arch/arm/boot/dts/ccu8540-pinctrl.dtsi b/arch/arm/boot/dts/ccu8540-pinctrl.dtsi
>> new file mode 100644
>> index 0000000..26e718b
>> --- /dev/null
>> +++ b/arch/arm/boot/dts/ccu8540-pinctrl.dtsi
>> @@ -0,0 +1,77 @@
>> +/*
>> + * Copyright 2012 ST-Ericsson
>> + *
>> + * The code contained herein is licensed under the GNU General Public
>> + * License. You may obtain a copy of the GNU General Public License
>> + * Version 2 or later at the following locations:
>> + *
>> + * http://www.opensource.org/licenses/gpl-license.html
>> + * http://www.gnu.org/copyleft/gpl.html
>> + */
>> +#include "ste-nomadik-pinctrl.dtsi"
>> +
>> +&pinctrl_dbx500 {
>
> What does the '&' do?
>
'&pinctrl_dbx500 {' is a shortcut, avoid writing :
soc {
princtrl {
...
};
};
>> + uart0 {
>> + uart0_default_mux: uart0_mux {
>> + default_mux {
>> + ste,function = "u0";
>> + ste,pins = "u0_a_1";
>> + };
>> + };
>> +
>> + uart0_default_mode: uart0_default {
>> + default_cfg1 {
>> + ste,pins = "GPIO0", "GPIO2";
>> + ste,config = <&in_pu>;
>> + };
>> +
>> + default_cfg2 {
>> + ste,pins = "GPIO1", "GPIO3";
>> + ste,config = <&out_hi>;
>> + };
>> + };
>> +
>> + uart0_sleep_mode: uart0_sleep {
>> + sleep_cfg1 {
>> + ste,pins = "GPIO0", "GPIO2";
>> + ste,config = <&slpm_in_pu>;
>> + };
>> +
>> + sleep_cfg2 {
>> + ste,pins = "GPIO1", "GPIO3";
>> + ste,config = <&slpm_out_hi>;
>> + };
>> + };
>> + };
>> +
>> + uart2 {
>> + uart2_default_mode: uart2_default {
>> + default_mux {
>> + ste,function = "u2";
>> + ste,pins = "u2txrx_a_1";
>> + };
>> +
>> + default_cfg1 {
>> + ste,pins = "GPIO120";
>> + ste,config = <&in_pu>;
>> + };
>> +
>> + default_cfg2 {
>> + ste,pins = "GPIO121";
>> + ste,config = <&out_hi>;
>> + };
>> + };
>> +
>> + uart2_sleep_mode: uart2_sleep {
>> + sleep_cfg1 {
>> + ste,pins = "GPIO120";
>> + ste,config = <&slpm_in_pu>;
>> + };
>> +
>> + sleep_cfg2 {
>> + ste,pins = "GPIO121";
>> + ste,config = <&slpm_out_hi>;
>> + };
>> + };
>> + };
>> +};
>> diff --git a/arch/arm/boot/dts/ccu8540.dts b/arch/arm/boot/dts/ccu8540.dts
>> index 5de9e1e..4f93795 100644
>> --- a/arch/arm/boot/dts/ccu8540.dts
>> +++ b/arch/arm/boot/dts/ccu8540.dts
>> @@ -11,6 +11,7 @@
>>
>> /dts-v1/;
>> #include "dbx5x0.dtsi"
>> +#include "ccu8540-pinctrl.dtsi"
>>
>> / {
>> model = "ST-Ericsson U8540 platform with Device Tree";
>> @@ -27,6 +28,9 @@
>> };
>>
>> uart@...20000 {
>> + pinctrl-names = "default", "sleep";
>> + pinctrl-0 = <&uart0_default_mux>, <&uart0_default_mode>;
>> + pinctrl-1 = <&uart0_sleep_mode>;
>> status = "okay";
>> };
>>
>> @@ -35,6 +39,9 @@
>> };
>>
>> uart@...07000 {
>> + pinctrl-names = "default", "sleep";
>> + pinctrl-0 = <&uart2_default_mode>;
>> + pinctrl-1 = <&uart2_sleep_mode>;
>> status = "okay";
>> };
>> };
>> diff --git a/arch/arm/boot/dts/dbx5x0.dtsi b/arch/arm/boot/dts/dbx5x0.dtsi
>> index f85ff85..7507148 100644
>> --- a/arch/arm/boot/dts/dbx5x0.dtsi
>> +++ b/arch/arm/boot/dts/dbx5x0.dtsi
>> @@ -170,7 +170,7 @@
>> gpio-bank = <8>;
>> };
>>
>> - pinctrl {
>> + pinctrl_dbx500: pinctrl {
>> compatible = "stericsson,nmk-pinctrl";
>> prcm = <&prcmu>;
>> };
>> diff --git a/arch/arm/boot/dts/ste-nomadik-pinctrl.dtsi b/arch/arm/boot/dts/ste-nomadik-pinctrl.dtsi
>> new file mode 100644
>> index 0000000..efddee9
>> --- /dev/null
>> +++ b/arch/arm/boot/dts/ste-nomadik-pinctrl.dtsi
>> @@ -0,0 +1,95 @@
>> +/*
>> + * Copyright 2012 ST-Ericsson
>> + *
>> + * The code contained herein is licensed under the GNU General Public
>> + * License. You may obtain a copy of the GNU General Public License
>> + * Version 2 or later at the following locations:
>> + *
>> + * http://www.opensource.org/licenses/gpl-license.html
>> + * http://www.gnu.org/copyleft/gpl.html
>> + */
>> +#include <dt-bindings/pinctrl/nomadik.h>
>> +
>> +/ {
>> + in_nopull: in_nopull {
>> + ste,input = <INPUT_NOPULL>;
>> + };
>> +
>> + in_pu: input_pull_up {
>> + ste,input = <INPUT_PULLUP>;
>> + };
>> +
>> + in_pd: input_pull_down {
>> + ste,input = <INPUT_PULLDOWN>;
>> + };
>> +
>> + out_hi: output_high {
>> + ste,output = <OUTPUT_HIGH>;
>> + };
>> +
>> + out_lo: output_low {
>> + ste,output = <OUTPUT_LOW>;
>> + };
>> +
>> + gpio_out_lo: gpio_output_low {
>> + ste,gpio = <GPIOMODE_ENABLED>;
>> + ste,output = <OUTPUT_LOW>;
>> + };
>> +
>> + slpm_in_pu: slpm_in_pu {
>> + ste,sleep = <SLPM_ENABLED>;
>> + ste,sleep-input = <SLPM_INPUT_PULLUP>;
>> + ste,sleep-wakeup = <SLPM_WAKEUP_ENABLE>;
>> + };
>> +
>> + slpm_in_wkup_pdis: slpm_in_wkup_pdis {
>> + ste,sleep = <SLPM_ENABLED>;
>> + ste,sleep-input = <SLPM_DIR_INPUT>;
>> + ste,sleep-wakeup = <SLPM_WAKEUP_ENABLE>;
>> + ste,sleep-pull-disable = <SLPM_PDIS_DISABLED>;
>> + };
>> +
>> + slpm_out_lo: slpm_out_lo {
>> + ste,sleep = <SLPM_ENABLED>;
>> + ste,sleep-output = <SLPM_OUTPUT_LOW>;
>> + ste,sleep-wakeup = <SLPM_WAKEUP_ENABLE>;
>> + };
>> +
>> + slpm_out_hi: slpm_out_hi {
>> + ste,sleep = <SLPM_ENABLED>;
>> + ste,sleep-output = <SLPM_OUTPUT_HIGH>;
>> + ste,sleep-wakeup = <SLPM_WAKEUP_ENABLE>;
>> + };
>> +
>> + slpm_out_hi_wkup_pdis: slpm_out_hi_wkup_pdis {
>> + ste,sleep = <SLPM_ENABLED>;
>> + ste,sleep-output = <SLPM_OUTPUT_HIGH>;
>> + ste,sleep-wakeup = <SLPM_WAKEUP_ENABLE>;
>> + ste,sleep-pull-disable = <SLPM_PDIS_DISABLED>;
>> + };
>> +
>> + slpm_out_wkup_pdis: slpm_out_wkup_pdis {
>> + ste,sleep = <SLPM_ENABLED>;
>> + ste,sleep-output = <SLPM_DIR_OUTPUT>;
>> + ste,sleep-wakeup = <SLPM_WAKEUP_ENABLE>;
>> + ste,sleep-pull-disable = <SLPM_PDIS_DISABLED>;
>> + };
>> +
>> + in_wkup_pdis: in_wkup_pdis {
>> + ste,sleep-input = <SLPM_DIR_INPUT>;
>> + ste,sleep-wakeup = <SLPM_WAKEUP_ENABLE>;
>> + ste,sleep-pull-disable = <SLPM_PDIS_DISABLED>;
>> + };
>> +
>> + out_hi_wkup_pdis: out_hi_wkup_pdis {
>> + ste,sleep-output = <SLPM_OUTPUT_HIGH>;
>> + ste,sleep-wakeup = <SLPM_WAKEUP_ENABLE>;
>> + ste,sleep-pull-disable = <SLPM_PDIS_DISABLED>;
>> + };
>> +
>> + out_wkup_pdis: out_wkup_pdis {
>> + ste,sleep-output = <SLPM_DIR_OUTPUT>;
>> + ste,sleep-wakeup = <SLPM_WAKEUP_ENABLE>;
>> + ste,sleep-pull-disable = <SLPM_PDIS_DISABLED>;
>> + };
>> +};
>
> Nodes look pretty good, except shouldn't 'ste' really be 'stericsson'?
>
> Yes, it's not as succinct, but it is the standard.
>
yes it's more succint...;)
in Documentation/devicetree/bindings/vendor-prefixes.txt we have both
(ste and stericsson for ST-Ericsson)
>> diff --git a/include/dt-bindings/pinctrl/nomadik.h b/include/dt-bindings/pinctrl/nomadik.h
>> new file mode 100644
>> index 0000000..638fb32
>> --- /dev/null
>> +++ b/include/dt-bindings/pinctrl/nomadik.h
>> @@ -0,0 +1,36 @@
>> +/*
>> + * nomadik.h
>> + *
>> + * Copyright (C) ST-Ericsson SA 2013
>> + * Author: Gabriel Fernandez <gabriel.fernandez@...com> for ST-Ericsson.
>> + * License terms: GNU General Public License (GPL), version 2
>> + */
>> +
>> +#define INPUT_NOPULL 0
>> +#define INPUT_PULLUP 1
>> +#define INPUT_PULLDOWN 2
>> +
>> +#define OUTPUT_LOW 0
>> +#define OUTPUT_HIGH 1
>> +#define DIR_OUTPUT 2
>> +
>> +#define SLPM_DISABLED 0
>> +#define SLPM_ENABLED 1
>> +
>> +#define SLPM_INPUT_NOPULL 0
>> +#define SLPM_INPUT_PULLUP 1
>> +#define SLPM_INPUT_PULLDOWN 2
>> +#define SLPM_DIR_INPUT 3
>> +
>> +#define SLPM_OUTPUT_LOW 0
>> +#define SLPM_OUTPUT_HIGH 1
>> +#define SLPM_DIR_OUTPUT 2
>> +
>> +#define SLPM_WAKEUP_DISABLE 0
>> +#define SLPM_WAKEUP_ENABLE 1
>> +
>> +#define GPIOMODE_DISABLED 0
>> +#define GPIOMODE_ENABLED 1
>> +
>> +#define SLPM_PDIS_DISABLED 0
>> +#define SLPM_PDIS_ENABLED 1
>
> Some stray tabbing above.
once the patch has been applied, all values are aligned in the source file.
(due to '+' character i think)
>
> --
> Lee Jones
> Linaro ST-Ericsson Landing Team Lead
> Linaro.org │ Open source software for ARM SoCs
> Follow Linaro: Facebook | Twitter | Blog
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