mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-16 23:45:31 +08:00
87b30c4b0e
Calling of_find_compatible_node() returns a node pointer with refcount incremented. Use of_node_put() on it when done. The patch fixes the same problem on different i.MX platforms. Fixes:8b88f7ef31("ARM: mx25: Retrieve IIM base from dt") Fixes:94b2bec1b0("ARM: imx27: Retrieve the SYSCTRL base address from devicetree") Fixes:3172225d45("ARM: imx31: Retrieve the IIM base address from devicetree") Fixes:f68ea682d1("ARM: imx35: Retrieve the IIM base address from devicetree") Fixes:ee18a7154e("ARM: imx5: retrieve iim base from device tree") Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com> Reviewed-by: Fabio Estevam <festevam@gmail.com> Reviewed-by: Martin Kaiser <martin@kaiser.cx> Signed-off-by: Shawn Guo <shawnguo@kernel.org>
48 lines
896 B
C
48 lines
896 B
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* MX35 CPU type detection
|
|
*
|
|
* Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
|
|
*/
|
|
#include <linux/module.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/io.h>
|
|
|
|
#include "hardware.h"
|
|
#include "iim.h"
|
|
|
|
static int mx35_cpu_rev = -1;
|
|
|
|
static int mx35_read_cpu_rev(void)
|
|
{
|
|
void __iomem *iim_base;
|
|
struct device_node *np;
|
|
u32 rev;
|
|
|
|
np = of_find_compatible_node(NULL, NULL, "fsl,imx35-iim");
|
|
iim_base = of_iomap(np, 0);
|
|
of_node_put(np);
|
|
BUG_ON(!iim_base);
|
|
|
|
rev = imx_readl(iim_base + MXC_IIMSREV);
|
|
switch (rev) {
|
|
case 0x00:
|
|
return IMX_CHIP_REVISION_1_0;
|
|
case 0x10:
|
|
return IMX_CHIP_REVISION_2_0;
|
|
case 0x11:
|
|
return IMX_CHIP_REVISION_2_1;
|
|
default:
|
|
return IMX_CHIP_REVISION_UNKNOWN;
|
|
}
|
|
}
|
|
|
|
int mx35_revision(void)
|
|
{
|
|
if (mx35_cpu_rev == -1)
|
|
mx35_cpu_rev = mx35_read_cpu_rev();
|
|
|
|
return mx35_cpu_rev;
|
|
}
|
|
EXPORT_SYMBOL(mx35_revision);
|