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Date: Mon, 14 Mar 2011 21:35:35 -0600
From: Grant Likely <grant.likely@...retlab.ca>
To: Daniel Drake <dsd@...top.org>
Cc: tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
x86@...nel.org, dilinger@...ued.net,
devicetree-discuss@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] OLPC: Use device tree for platform identification
On Sun, Mar 13, 2011 at 03:10:17PM +0000, Daniel Drake wrote:
> Make OLPC fully depend on device tree, and use it to identify the OLPC
> platform details. Some nodes are exposed as platform devices where we
> plan to use device tree for device probing.
>
> Signed-off-by: Daniel Drake <dsd@...top.org>
Acked-by: Grant Likely <grant.likely@...retlab.ca>
> ---
> arch/x86/Kconfig | 2 +-
> arch/x86/include/asm/olpc_ofw.h | 9 ++----
> arch/x86/platform/olpc/Makefile | 4 +--
> arch/x86/platform/olpc/olpc.c | 51 ++++++++++++++++++++------------------
> arch/x86/platform/olpc/olpc_dt.c | 19 ++++++++++++++
> 5 files changed, 51 insertions(+), 34 deletions(-)
>
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index 212186d..1dd0d8f 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -2069,7 +2069,7 @@ config OLPC
> depends on !X86_PAE
> select GPIOLIB
> select OF
> - select OF_PROMTREE if PROC_DEVICETREE
> + select OF_PROMTREE
> ---help---
> Add support for detecting the unique features of the OLPC
> XO hardware.
> diff --git a/arch/x86/include/asm/olpc_ofw.h b/arch/x86/include/asm/olpc_ofw.h
> index c5d3a5a..2448771 100644
> --- a/arch/x86/include/asm/olpc_ofw.h
> +++ b/arch/x86/include/asm/olpc_ofw.h
> @@ -26,15 +26,12 @@ extern void setup_olpc_ofw_pgd(void);
> /* check if OFW was detected during boot */
> extern bool olpc_ofw_present(void);
>
> +extern void olpc_dt_build_devicetree(void);
> +
> #else /* !CONFIG_OLPC */
> static inline void olpc_ofw_detect(void) { }
> static inline void setup_olpc_ofw_pgd(void) { }
> -#endif /* !CONFIG_OLPC */
> -
> -#ifdef CONFIG_OF_PROMTREE
> -extern void olpc_dt_build_devicetree(void);
> -#else
> static inline void olpc_dt_build_devicetree(void) { }
> -#endif
> +#endif /* !CONFIG_OLPC */
>
> #endif /* _ASM_X86_OLPC_OFW_H */
> diff --git a/arch/x86/platform/olpc/Makefile b/arch/x86/platform/olpc/Makefile
> index c2a8cab..81c5e21 100644
> --- a/arch/x86/platform/olpc/Makefile
> +++ b/arch/x86/platform/olpc/Makefile
> @@ -1,4 +1,2 @@
> -obj-$(CONFIG_OLPC) += olpc.o
> +obj-$(CONFIG_OLPC) += olpc.o olpc_ofw.o olpc_dt.o
> obj-$(CONFIG_OLPC_XO1) += olpc-xo1.o
> -obj-$(CONFIG_OLPC) += olpc_ofw.o
> -obj-$(CONFIG_OF_PROMTREE) += olpc_dt.o
> diff --git a/arch/x86/platform/olpc/olpc.c b/arch/x86/platform/olpc/olpc.c
> index edaf3fe..0060fd5 100644
> --- a/arch/x86/platform/olpc/olpc.c
> +++ b/arch/x86/platform/olpc/olpc.c
> @@ -18,6 +18,7 @@
> #include <linux/io.h>
> #include <linux/string.h>
> #include <linux/platform_device.h>
> +#include <linux/of.h>
>
> #include <asm/geode.h>
> #include <asm/setup.h>
> @@ -187,41 +188,43 @@ err:
> }
> EXPORT_SYMBOL_GPL(olpc_ec_cmd);
>
> -static bool __init check_ofw_architecture(void)
> +static bool __init check_ofw_architecture(struct device_node *root)
> {
> - size_t propsize;
> - char olpc_arch[5];
> - const void *args[] = { NULL, "architecture", olpc_arch, (void *)5 };
> - void *res[] = { &propsize };
> + const char *olpc_arch;
> + int propsize;
>
> - if (olpc_ofw("getprop", args, res)) {
> - printk(KERN_ERR "ofw: getprop call failed!\n");
> - return false;
> - }
> + olpc_arch = of_get_property(root, "architecture", &propsize);
> return propsize == 5 && strncmp("OLPC", olpc_arch, 5) == 0;
> }
>
> -static u32 __init get_board_revision(void)
> +static u32 __init get_board_revision(struct device_node *root)
> {
> - size_t propsize;
> - __be32 rev;
> - const void *args[] = { NULL, "board-revision-int", &rev, (void *)4 };
> - void *res[] = { &propsize };
> -
> - if (olpc_ofw("getprop", args, res) || propsize != 4) {
> - printk(KERN_ERR "ofw: getprop call failed!\n");
> - return cpu_to_be32(0);
> - }
> - return be32_to_cpu(rev);
> + int propsize;
> + const __be32 *rev;
> +
> + rev = of_get_property(root, "board-revision-int", &propsize);
> + if (propsize != 4)
> + return 0;
> +
> + return be32_to_cpu(*rev);
> }
>
> static bool __init platform_detect(void)
> {
> - if (!check_ofw_architecture())
> + struct device_node *root = of_find_node_by_path("/");
> + bool success;
> +
> + if (!root)
> return false;
> - olpc_platform_info.flags |= OLPC_F_PRESENT;
> - olpc_platform_info.boardrev = get_board_revision();
> - return true;
> +
> + success = check_ofw_architecture(root);
> + if (success) {
> + olpc_platform_info.boardrev = get_board_revision(root);
> + olpc_platform_info.flags |= OLPC_F_PRESENT;
> + }
> +
> + of_node_put(root);
> + return success;
> }
>
> static int __init add_xo1_platform_devices(void)
> diff --git a/arch/x86/platform/olpc/olpc_dt.c b/arch/x86/platform/olpc/olpc_dt.c
> index 044bda5..d39f63d 100644
> --- a/arch/x86/platform/olpc/olpc_dt.c
> +++ b/arch/x86/platform/olpc/olpc_dt.c
> @@ -19,7 +19,9 @@
> #include <linux/kernel.h>
> #include <linux/bootmem.h>
> #include <linux/of.h>
> +#include <linux/of_platform.h>
> #include <linux/of_pdt.h>
> +#include <asm/olpc.h>
> #include <asm/olpc_ofw.h>
>
> static phandle __init olpc_dt_getsibling(phandle node)
> @@ -180,3 +182,20 @@ void __init olpc_dt_build_devicetree(void)
> pr_info("PROM DT: Built device tree with %u bytes of memory.\n",
> prom_early_allocated);
> }
> +
> +/* A list of DT node/bus matches that we want to expose as platform devices */
> +static struct of_device_id __initdata of_ids[] = {
> + { .compatible = "olpc,xo1-battery" },
> + { .compatible = "olpc,xo1-dcon" },
> + { .compatible = "olpc,xo1-rtc" },
> + {},
> +};
> +
> +static int __init olpc_create_platform_devices(void)
> +{
> + if (machine_is_olpc())
> + return of_platform_bus_probe(NULL, of_ids, NULL);
> + else
> + return 0;
> +}
> +device_initcall(olpc_create_platform_devices);
> --
> 1.7.4
>
--
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