linux-kernel - Re: [PATCH v6 36/36] ARM: STi: Add support for the FSM Serial Flash Controller

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Date:	Thu, 20 Mar 2014 04:27:03 -0700
From:	Brian Norris <computersforpeace@...il.com>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-mtd@...ts.infradead.org, dwmw2@...radead.org,
	Angus.Clark@...com
Subject: Re: [PATCH v6 36/36] ARM: STi: Add support for the FSM Serial Flash
 Controller

On Thu, Mar 20, 2014 at 09:21:08AM +0000, Lee Jones wrote:
> Here we add the necessary device nodes required for successful device
> probing and Pinctrl setup for the FSM.
> 
> Acked-by: Srinivas Kandagatla <srinivas.kandagatla@...com>
> Acked-by Angus Clark <angus.clark@...com>
> Signed-off-by: Lee Jones <lee.jones@...aro.org>
> ---
>  arch/arm/boot/dts/stih416-pinctrl.dtsi | 13 +++++++++++++
>  arch/arm/boot/dts/stih416.dtsi         | 13 +++++++++++++
>  arch/arm/boot/dts/stih41x-b2020.dtsi   |  1 +
>  arch/arm/boot/dts/stih41x-b2020x.dtsi  | 28 ++++++++++++++++++++++++++++
>  4 files changed, 55 insertions(+)
>  create mode 100644 arch/arm/boot/dts/stih41x-b2020x.dtsi
> 
> diff --git a/arch/arm/boot/dts/stih416-pinctrl.dtsi b/arch/arm/boot/dts/stih416-pinctrl.dtsi
> index b29ff4b..81df8e7 100644
> --- a/arch/arm/boot/dts/stih416-pinctrl.dtsi
> +++ b/arch/arm/boot/dts/stih416-pinctrl.dtsi
> @@ -210,6 +210,19 @@
>  					};
>  				};
>  			};
> +
> +			fsm {
> +				pinctrl_fsm: fsm {
> +					st,pins {
> +						spi-fsm-clk  = <&PIO12 2 ALT1 OUT>;
> +						spi-fsm-cs   = <&PIO12 3 ALT1 OUT>;
> +						spi-fsm-mosi = <&PIO12 4 ALT1 OUT>;
> +						spi-fsm-miso = <&PIO12 5 ALT1 IN>;
> +						spi-fsm-hol  = <&PIO12 6 ALT1 OUT>;
> +						spi-fsm-wp   = <&PIO12 7 ALT1 OUT>;
> +					};
> +				};
> +			};
>  		};
>  
>  		pin-controller-rear {
> diff --git a/arch/arm/boot/dts/stih416.dtsi b/arch/arm/boot/dts/stih416.dtsi
> index b7ab47b..1e24b9e 100644
> --- a/arch/arm/boot/dts/stih416.dtsi
> +++ b/arch/arm/boot/dts/stih416.dtsi
> @@ -145,5 +145,18 @@
>  
>  			status		= "disabled";
>  		};
> +
> +		/* FSM */
> +		spifsm: spifsm@...02000 {
> +			compatible	   = "st,spi-fsm";
> +			reg		   = <0xfe902000 0x1000>;
> +			pinctrl-0	   = <&pinctrl_fsm>;
> +
> +			st,syscfg	   = <&syscfg_rear>;
> +			st,boot-device-reg = <0x958>;
> +			st,boot-device-spi = <0x1a>;
> +
> +			status = "disabled";
> +		};
>  	};
>  };
> diff --git a/arch/arm/boot/dts/stih41x-b2020.dtsi b/arch/arm/boot/dts/stih41x-b2020.dtsi
> index 0ef0a69..01487e0 100644
> --- a/arch/arm/boot/dts/stih41x-b2020.dtsi
> +++ b/arch/arm/boot/dts/stih41x-b2020.dtsi
> @@ -6,6 +6,7 @@
>   * it under the terms of the GNU General Public License version 2 as
>   * publishhed by the Free Software Foundation.
>   */
> +#include "stih41x-b2020x.dtsi"
>  / {
>  	memory{
>  		device_type = "memory";
> diff --git a/arch/arm/boot/dts/stih41x-b2020x.dtsi b/arch/arm/boot/dts/stih41x-b2020x.dtsi
> new file mode 100644
> index 0000000..d9af63d
> --- /dev/null
> +++ b/arch/arm/boot/dts/stih41x-b2020x.dtsi
> @@ -0,0 +1,28 @@
> +/*
> + * Copyright (C) 2013 STMicroelectronics (R&D) Limited.
> + * Author: Lee Jones <lee.jones@...aro.org>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * publishhed by the Free Software Foundation.
> + */
> +/ {
> +	soc {
> +		spifsm: spifsm@...02000 {
> +			#address-cells = <1>;
> +			#size-cells    = <1>;
> +
> +			status = "okay";
> +
> +			partition@0 {
> +				label = "Serial Flash 1";

Are you sure you want spaces in the partition label? I suppose MTD can
probably handle this fine, but it doesn't seem standard, and it may
prevent you from using the partition name in certain ways. For instance,
it might make it harder to use with the "ubi.mtd=" module parameter.

But otherwise:

Acked-by: Brian Norris <computersforpeace@...il.com>

> +				reg   = <0x00000000 0x00500000>;
> +			};
> +
> +			partition@...000 {
> +				label = "Serial Flash 2";
> +				reg   = <0x00500000 0x00b00000>;
> +			};
> +		};
> +	};
> +};

Brian
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