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Date: Fri, 17 Jan 2020 02:04:40 +0000
From: Jacky Bai <ping.bai@....com>
To: Peng Fan <peng.fan@....com>,
"shawnguo@...nel.org" <shawnguo@...nel.org>,
"s.hauer@...gutronix.de" <s.hauer@...gutronix.de>
CC: "kernel@...gutronix.de" <kernel@...gutronix.de>,
"festevam@...il.com" <festevam@...il.com>,
dl-linux-imx <linux-imx@....com>,
"allison@...utok.net" <allison@...utok.net>,
"info@...ux.net" <info@...ux.net>,
Anson Huang <anson.huang@....com>,
Leonard Crestez <leonard.crestez@....com>,
"git@...red.net" <git@...red.net>, Abel Vesa <abel.vesa@....com>,
"ard.biesheuvel@...aro.org" <ard.biesheuvel@...aro.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [RFC 1/4] ARM: imx: use device_initcall for imx_soc_device_init
> -----Original Message-----
> From: Peng Fan <peng.fan@....com>
> Sent: Thursday, January 16, 2020 5:37 PM
> To: shawnguo@...nel.org; s.hauer@...gutronix.de
> Cc: kernel@...gutronix.de; festevam@...il.com; dl-linux-imx
> <linux-imx@....com>; allison@...utok.net; info@...ux.net; Anson Huang
> <anson.huang@....com>; Leonard Crestez <leonard.crestez@....com>;
> git@...red.net; Abel Vesa <abel.vesa@....com>; ard.biesheuvel@...aro.org;
> linux-arm-kernel@...ts.infradead.org; linux-kernel@...r.kernel.org; Peng Fan
> <peng.fan@....com>
> Subject: [RFC 1/4] ARM: imx: use device_initcall for imx_soc_device_init
>
> From: Peng Fan <peng.fan@....com>
>
> This is preparation to move imx_soc_device_init to drivers/soc/imx/
>
> There is no reason to must put dt devices under /sys/devices/soc0, they could
> also be under /sys/devices/platform, so we could pass NULL as parent when
> calling of_platform_default_populate.
>
This change will impact various internal test case & userspace lib, I think.
Need to ask test team & other developer to double check the impact.
BR
Jacky Bai
> Following soc-imx8.c soc-imx-scu.c using device_initcall, need to change
> return type to int type for imx_soc_device_init.
>
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
> arch/arm/mach-imx/common.h | 1 -
> arch/arm/mach-imx/cpu.c | 9 +++++----
> arch/arm/mach-imx/mach-imx6q.c | 8 +-------
> arch/arm/mach-imx/mach-imx6sl.c | 8 +-------
> arch/arm/mach-imx/mach-imx6sx.c | 8 +-------
> arch/arm/mach-imx/mach-imx6ul.c | 8 +-------
> arch/arm/mach-imx/mach-imx7d.c | 6 ------
> arch/arm/mach-imx/mach-imx7ulp.c | 2 +-
> 8 files changed, 10 insertions(+), 40 deletions(-)
>
> diff --git a/arch/arm/mach-imx/common.h b/arch/arm/mach-imx/common.h
> index 912aeceb4ff8..09e89aa7be50 100644
> --- a/arch/arm/mach-imx/common.h
> +++ b/arch/arm/mach-imx/common.h
> @@ -49,7 +49,6 @@ void imx_aips_allow_unprivileged_access(const char
> *compat); int mxc_device_init(void); void imx_set_soc_revision(unsigned
> int rev); void imx_init_revision_from_anatop(void);
> -struct device *imx_soc_device_init(void); void imx6_enable_rbc(bool
> enable); void imx_gpc_check_dt(void); void
> imx_gpc_set_arm_power_in_lpm(bool power_off); diff --git
> a/arch/arm/mach-imx/cpu.c b/arch/arm/mach-imx/cpu.c index
> 06f8d64b65af..2df649a84697 100644
> --- a/arch/arm/mach-imx/cpu.c
> +++ b/arch/arm/mach-imx/cpu.c
> @@ -83,7 +83,7 @@ void __init imx_aips_allow_unprivileged_access(
> }
> }
>
> -struct device * __init imx_soc_device_init(void)
> +static int __init imx_soc_device_init(void)
> {
> struct soc_device_attribute *soc_dev_attr;
> const char *ocotp_compat = NULL;
> @@ -97,7 +97,7 @@ struct device * __init imx_soc_device_init(void)
>
> soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
> if (!soc_dev_attr)
> - return NULL;
> + return PTR_ERR(soc_dev_attr);
>
> soc_dev_attr->family = "Freescale i.MX";
>
> @@ -219,7 +219,7 @@ struct device * __init imx_soc_device_init(void)
> if (IS_ERR(soc_dev))
> goto free_serial_number;
>
> - return soc_device_to_device(soc_dev);
> + return 0;
>
> free_serial_number:
> kfree(soc_dev_attr->serial_number);
> @@ -227,5 +227,6 @@ struct device * __init imx_soc_device_init(void)
> kfree(soc_dev_attr->revision);
> free_soc:
> kfree(soc_dev_attr);
> - return NULL;
> + return -ENOMEM;
> }
> +device_initcall(imx_soc_device_init);
> diff --git a/arch/arm/mach-imx/mach-imx6q.c
> b/arch/arm/mach-imx/mach-imx6q.c index edd26e0ffeec..735da3311320
> 100644
> --- a/arch/arm/mach-imx/mach-imx6q.c
> +++ b/arch/arm/mach-imx/mach-imx6q.c
> @@ -258,21 +258,15 @@ static void __init imx6q_axi_init(void)
>
> static void __init imx6q_init_machine(void) {
> - struct device *parent;
> -
> if (cpu_is_imx6q() && imx_get_soc_revision() ==
> IMX_CHIP_REVISION_2_0)
> imx_print_silicon_rev("i.MX6QP", IMX_CHIP_REVISION_1_0);
> else
> imx_print_silicon_rev(cpu_is_imx6dl() ? "i.MX6DL" : "i.MX6Q",
> imx_get_soc_revision());
>
> - parent = imx_soc_device_init();
> - if (parent == NULL)
> - pr_warn("failed to initialize soc device\n");
> -
> imx6q_enet_phy_init();
>
> - of_platform_default_populate(NULL, NULL, parent);
> + of_platform_default_populate(NULL, NULL, NULL);
>
> imx_anatop_init();
> cpu_is_imx6q() ? imx6q_pm_init() : imx6dl_pm_init(); diff --git
> a/arch/arm/mach-imx/mach-imx6sl.c b/arch/arm/mach-imx/mach-imx6sl.c
> index e00818abe54d..0f046a37dc73 100644
> --- a/arch/arm/mach-imx/mach-imx6sl.c
> +++ b/arch/arm/mach-imx/mach-imx6sl.c
> @@ -46,13 +46,7 @@ static void __init imx6sl_init_late(void)
>
> static void __init imx6sl_init_machine(void) {
> - struct device *parent;
> -
> - parent = imx_soc_device_init();
> - if (parent == NULL)
> - pr_warn("failed to initialize soc device\n");
> -
> - of_platform_default_populate(NULL, NULL, parent);
> + of_platform_default_populate(NULL, NULL, NULL);
>
> if (cpu_is_imx6sl())
> imx6sl_fec_init();
> diff --git a/arch/arm/mach-imx/mach-imx6sx.c
> b/arch/arm/mach-imx/mach-imx6sx.c index d5310bf307ff..781e2a94fdd7
> 100644
> --- a/arch/arm/mach-imx/mach-imx6sx.c
> +++ b/arch/arm/mach-imx/mach-imx6sx.c
> @@ -63,13 +63,7 @@ static inline void imx6sx_enet_init(void)
>
> static void __init imx6sx_init_machine(void) {
> - struct device *parent;
> -
> - parent = imx_soc_device_init();
> - if (parent == NULL)
> - pr_warn("failed to initialize soc device\n");
> -
> - of_platform_default_populate(NULL, NULL, parent);
> + of_platform_default_populate(NULL, NULL, NULL);
>
> imx6sx_enet_init();
> imx_anatop_init();
> diff --git a/arch/arm/mach-imx/mach-imx6ul.c
> b/arch/arm/mach-imx/mach-imx6ul.c index 311f5e4ff723..9db8e567c6b5
> 100644
> --- a/arch/arm/mach-imx/mach-imx6ul.c
> +++ b/arch/arm/mach-imx/mach-imx6ul.c
> @@ -56,13 +56,7 @@ static inline void imx6ul_enet_init(void)
>
> static void __init imx6ul_init_machine(void) {
> - struct device *parent;
> -
> - parent = imx_soc_device_init();
> - if (parent == NULL)
> - pr_warn("failed to initialize soc device\n");
> -
> - of_platform_default_populate(NULL, NULL, parent);
> + of_platform_default_populate(NULL, NULL, NULL);
> imx6ul_enet_init();
> imx_anatop_init();
> imx6ul_pm_init();
> diff --git a/arch/arm/mach-imx/mach-imx7d.c
> b/arch/arm/mach-imx/mach-imx7d.c index ebb27592a9f7..879c35929a13
> 100644
> --- a/arch/arm/mach-imx/mach-imx7d.c
> +++ b/arch/arm/mach-imx/mach-imx7d.c
> @@ -78,12 +78,6 @@ static inline void imx7d_enet_init(void)
>
> static void __init imx7d_init_machine(void) {
> - struct device *parent;
> -
> - parent = imx_soc_device_init();
> - if (parent == NULL)
> - pr_warn("failed to initialize soc device\n");
> -
> imx_anatop_init();
> imx7d_enet_init();
> }
> diff --git a/arch/arm/mach-imx/mach-imx7ulp.c
> b/arch/arm/mach-imx/mach-imx7ulp.c
> index 11ac71aaf965..128cf4c92aab 100644
> --- a/arch/arm/mach-imx/mach-imx7ulp.c
> +++ b/arch/arm/mach-imx/mach-imx7ulp.c
> @@ -57,7 +57,7 @@ static void __init imx7ulp_init_machine(void)
>
> mxc_set_cpu_type(MXC_CPU_IMX7ULP);
> imx7ulp_set_revision();
> - of_platform_default_populate(NULL, NULL, imx_soc_device_init());
> + of_platform_default_populate(NULL, NULL, NULL);
> }
>
> static const char *const imx7ulp_dt_compat[] __initconst = {
> --
> 2.16.4
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