[PATCH v2 01/11] ARM: imx27: Retrieve the SYSCTRL base address from devicetree
flat view
STALE2218d
From: Fabio Estevam <festevam@gmail.com>
Date: 2020-09-17 00:43:46
Subsystem:
arm port, the rest · Maintainers:
Russell King, Linus Torvalds
Revision v2 of 2 in this series.
Revisions (2)
- v1 [diff vs current]
- v2 current
Now that imx27 has been converted to a devicetree-only platform, retrieve the SYSCTRL base address from devicetree. To keep devicetree compatibilty the SYSCTRL base address will be retrieved from the CCM base address plus an 0x800 offset. This is not a problem as the imx27.dtsi describes the CCM register range as 0x1000. Signed-off-by: Fabio Estevam <festevam@gmail.com> --- Changes since v1: - Do not introduce a sysctrl node to avoid breaking DT compatibility (Arnd) arch/arm/mach-imx/cpu-imx27.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/arch/arm/mach-imx/cpu-imx27.c b/arch/arm/mach-imx/cpu-imx27.c
index a969aa71b60f..bf70e13bbe9e 100644
--- a/arch/arm/mach-imx/cpu-imx27.c
+++ b/arch/arm/mach-imx/cpu-imx27.c@@ -9,6 +9,7 @@ */ #include <linux/io.h> +#include <linux/of_address.h> #include <linux/module.h> #include "hardware.h"
@@ -17,16 +18,23 @@ static int mx27_cpu_rev = -1; static int mx27_cpu_partnumber; #define SYS_CHIP_ID 0x00 /* The offset of CHIP ID register */ +#define SYSCTRL_OFFSET 0x800 /* Offset from CCM base address */ static int mx27_read_cpu_rev(void) { + void __iomem *ccm_base; + struct device_node *np; u32 val; + + np = of_find_compatible_node(NULL, NULL, "fsl,imx27-ccm"); + ccm_base = of_iomap(np, 0); + BUG_ON(!ccm_base); /* * now we have access to the IO registers. As we need * the silicon revision very early we read it here to * avoid any further hooks */ - val = imx_readl(MX27_IO_ADDRESS(MX27_SYSCTRL_BASE_ADDR + SYS_CHIP_ID)); + val = imx_readl(ccm_base + SYSCTRL_OFFSET + SYS_CHIP_ID); mx27_cpu_partnumber = (int)((val >> 12) & 0xFFFF);
--
2.17.1
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