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ARM: imx27: Retrieve the CCM base address from devicetree 

Now that imx27 has been converted to a devicetree-only platform,
retrieve the CCM base address from devicetree.

Signed-off-by: Fabio Estevam <festevam@gmail.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
This commit is contained in:
Fabio Estevam 2020-09-16 21:41:16 -03:00 committed by Shawn Guo
parent 94b2bec1b0
commit d54debc72f
1 changed files with 10 additions and 2 deletions
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12
arch/arm/mach-imx/pm-imx27.c
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@ -7,6 +7,7 @@
* modify it under the terms of the GNU General Public License.
*/
#include <linux/of_address.h>
#include <linux/kernel.h>
#include <linux/suspend.h>
#include <linux/io.h>
@ -15,13 +16,20 @@
static int mx27_suspend_enter(suspend_state_t state)
{
void __iomem *ccm_base;
struct device_node *np;
u32 cscr;
np = of_find_compatible_node(NULL, NULL, "fsl,imx27-ccm");
ccm_base = of_iomap(np, 0);
BUG_ON(!ccm_base);
switch (state) {
case PM_SUSPEND_MEM:
/* Clear MPEN and SPEN to disable MPLL/SPLL */
cscr = imx_readl(MX27_IO_ADDRESS(MX27_CCM_BASE_ADDR));
cscr = imx_readl(ccm_base);
cscr &= 0xFFFFFFFC;
imx_writel(cscr, MX27_IO_ADDRESS(MX27_CCM_BASE_ADDR));
imx_writel(cscr, ccm_base);
/* Executes WFI */
cpu_do_idle();
break;