linux-kernel - Re: [RFC][PATCH 3/3] dts: hikey: Add hikey support for sram-reboot-mode

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Date:	Wed, 27 Jan 2016 11:38:28 -0600
From:	Rob Herring <robh@...nel.org>
To:	John Stultz <john.stultz@...aro.org>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	Andy Yan <andy.yan@...k-chips.com>,
	Arnd Bergmann <arnd@...db.de>,
	Thierry Reding <treding@...dia.com>,
	Heiko Stübner <heiko@...ech.de>,
	Caesar Wang <wxt@...k-chips.com>,
	Kees Cook <keescook@...omium.org>,
	Guodong Xu <guodong.xu@...aro.org>,
	Haojian Zhuang <haojian.zhuang@...aro.org>,
	Vishal Bhoj <vishal.bhoj@...aro.org>,
	Bjorn Andersson <bjorn.andersson@...aro.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Android Kernel Team <kernel-team@...roid.com>
Subject: Re: [RFC][PATCH 3/3] dts: hikey: Add hikey support for sram-reboot-mode

On Tue, Jan 26, 2016 at 6:38 PM, John Stultz <john.stultz@...aro.org> wrote:
> Add support to hikey dts and defconfig for the
> sram-reboot-mode driver.
>
> The dts entries added here should really be generated
> by the UEFI firmware, and not be static in the dts,
> since one may be using different firmware on HiKey.
> But this patch provides an example of how the
> sram-reboot-mode entry would otherwise look.
>
> Cc: Andy Yan <andy.yan@...k-chips.com>
> Cc: Rob Herring <robh@...nel.org>
> Cc: Arnd Bergmann <arnd@...db.de>
> Cc: Thierry Reding <treding@...dia.com>
> Cc: Heiko Stübner <heiko@...ech.de>
> Cc: Caesar Wang <wxt@...k-chips.com>
> Cc: Kees Cook <keescook@...omium.org>
> Cc: Guodong Xu <guodong.xu@...aro.org>
> Cc: Haojian Zhuang <haojian.zhuang@...aro.org>
> Cc: Vishal Bhoj <vishal.bhoj@...aro.org>
> Cc: Bjorn Andersson <bjorn.andersson@...aro.org>
> Cc: devicetree@...r.kernel.org
> Cc: Android Kernel Team <kernel-team@...roid.com>
> Signed-off-by: John Stultz <john.stultz@...aro.org>
> ---
>  arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts | 36 ++++++++++++++++++++++++++
>  arch/arm64/configs/hikey_defconfig             |  3 +++
>  2 files changed, 39 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts b/arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts
> index 92f1704..67d12d0 100644
> --- a/arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts
> +++ b/arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts
> @@ -52,6 +52,11 @@
>                               <0x0 0x0740f000 0x0 0x00001000>;  /* MCU firmware section */
>                 };
>
> +               reboot-reason@...01000 {
> +                       no-map;
> +                       reg = <0x0 0x05f01000 0x0 0x00001000>;
> +               };
> +

This hunk should be dropped. These regions are for main memory.

>                 mbox-buf@...ff000 {
>                         no-map;
>                         reg = <0x0 0x06dff000 0x0 0x00001000>;  /* Mailbox message buf */
> @@ -71,6 +76,37 @@
>                 ftrace-size     = <0x0 0x00020000>;
>         };
>
> +
> +       /* This entry should really be provided by the UEFI firmware */
> +       sram@...1000 {
> +               compatible = "mmio-sram", "simple-bus";

The suggestion to put "simple-bus" here was really just for debugging.
Really, the mmio-sram driver should call of_platform_default_populate
to probe it's children.

> +               reg = <0x0 0x05f01000 0x0 0x00001000>;
> +               ranges = <0x0 0x0 0x05f01000 0x00001000>;
> +
> +               #address-cells = <1>;
> +               #size-cells = <1>;
> +
> +               reboot-mode@0 {
> +                       compatible = "sram-reboot-mode";
> +                       reg = <0x0 0x4>;
> +
> +                       none {
> +                               linux,mode = "none";
> +                               loader,magic = <0x77665501>;
> +                       };
> +
> +                       bootloader {
> +                               linux,mode = "bootloader";
> +                               loader,magic = <0x77665500>;
> +                       };
> +
> +                       recovery {
> +                               linux,mode = "recovery";
> +                               loader,magic = <0x77665502>;
> +                       };
> +               };
> +       };
> +
>         smb {
>                 uart0: uart@...15000 {  /* console */
>                         status = "ok";
> diff --git a/arch/arm64/configs/hikey_defconfig b/arch/arm64/configs/hikey_defconfig
> index a8375aa..e9db588 100644
> --- a/arch/arm64/configs/hikey_defconfig
> +++ b/arch/arm64/configs/hikey_defconfig
> @@ -201,6 +201,7 @@ CONFIG_BLK_DEV_LOOP=y
>  CONFIG_BLK_DEV_RAM=y
>  CONFIG_BLK_DEV_RAM_SIZE=16384
>  CONFIG_VIRTIO_BLK=y
> +CONFIG_SRAM=y
>  CONFIG_TI_ST=y
>  CONFIG_ST_HCI=y
>  # CONFIG_SCSI_PROC_FS is not set
> @@ -266,6 +267,8 @@ CONFIG_SPI_PL022=y
>  CONFIG_GPIO_SYSFS=y
>  CONFIG_GPIO_XGENE=y
>  CONFIG_POWER_RESET_SYSCON=y
> +CONFIG_SYSCON_REBOOT_MODE=y
> +CONFIG_SRAM_REBOOT_MODE=y
>  CONFIG_THERMAL=y
>  CONFIG_THERMAL_WRITABLE_TRIPS=y
>  CONFIG_THERMAL_DEFAULT_GOV_POWER_ALLOCATOR=y
> --
> 1.9.1
>