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s5p: cpu_info: print "cpu-model" if exists in dts

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The CPU name for Exynos was concatenated with cpu id,
but for new Exynos platforms, like Chromebook Peach Pi
based on Exynos5800, the name of SoC variant does not
include the real SoC cpu id (0x5422).

For such case, the CPU name should be defined in device tree.

This commit introduces new device-tree property for Exynos:
- "cpu-model" - with cpu name string
If defined, then the cpu id is not printed.

Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com>
Cc: Minkyu Kang <mk7.kang@samsung.com>
Cc: Simon Glass <sjg@chromium.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Anand Moon <linux.amoon@gmail.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
This commit is contained in:
Przemyslaw Marczak 2015-10-27 13:07:55 +01:00 committed by Minkyu Kang
parent bc3f39ea0d
commit fdbb740d7c
2 changed files with 34 additions and 1 deletions
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14
arch/arm/cpu/armv7/s5p-common/cpu_info.c
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@ -5,9 +5,12 @@
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <fdtdec.h>
#include <asm/io.h>
#include <asm/arch/clk.h>
DECLARE_GLOBAL_DATA_PTR;
/* Default is s5pc100 */
unsigned int s5p_cpu_id = 0xC100;
/* Default is EVT1 */
@ -30,7 +33,16 @@ u32 get_device_type(void)
#ifdef CONFIG_DISPLAY_CPUINFO
int print_cpuinfo(void)
{
printf("CPU: %s%X @ ", s5p_get_cpu_name(), s5p_cpu_id);
const char *cpu_model;
int len;
/* For SoC with no real CPU ID in naming convention. */
cpu_model = fdt_getprop(gd->fdt_blob, 0, "cpu-model", &len);
if (cpu_model)
printf("CPU: %.*s @ ", len, cpu_model);
else
printf("CPU: %s%X @ ", s5p_get_cpu_name(), s5p_cpu_id);
print_freq(get_arm_clk(), "\n");
return 0;

21
doc/device-tree-bindings/exynos/soc.txt Normal file
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@ -0,0 +1,21 @@
Exynos SoC model
The "cpu-model" property is a non-standard extension for the device tree root
node. Since the cpu id of some Exynos variants does not correspond to product
name, this property fills the gap.
For almost all Exynos based boards in the kernel, the product name corresponds
to the device tree file name. The same name is generated in U-Boot, so the new
property allows doing it automatically.
Required properties:
- cpu-model : Exynos product name
Example:
/ {
model = "Samsung/Google Peach Pi board based on Exynos5800";
cpu-model = "Exynos5800";
compatible = ...
};