[PATCH v3 4/6] mips: cdmm: Add mti,mips-cdmm dtb node support
From: Serge Semin <hidden>
Date: 2020-06-02 10:09:54
Also in:
linux-mips, lkml
Subsystem:
mips core drivers, the rest · Maintainers:
Thomas Bogendoerfer, Linus Torvalds
Since having and mapping the CDMM block is platform specific, then instead of just returning a zero-address, lets make the default CDMM base address search method (mips_cdmm_phys_base()) to do something useful. For instance to find the address in a dedicated dtb-node in order to support of-based platforms by default. Signed-off-by: Serge Semin <redacted> --- Changelog prev: - Use alphabetical order for the include pre-processor operator. --- drivers/bus/mips_cdmm.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+)
diff --git a/drivers/bus/mips_cdmm.c b/drivers/bus/mips_cdmm.c
index 1b14256376d2..9f7ed1fcd428 100644
--- a/drivers/bus/mips_cdmm.c
+++ b/drivers/bus/mips_cdmm.c@@ -13,6 +13,8 @@ #include <linux/cpu.h> #include <linux/cpumask.h> #include <linux/io.h> +#include <linux/of_address.h> +#include <linux/of.h> #include <linux/platform_device.h> #include <linux/slab.h> #include <linux/smp.h>
@@ -337,9 +339,22 @@ static phys_addr_t mips_cdmm_cur_base(void) * Picking a suitable physical address at which to map the CDMM region is * platform specific, so this weak function can be overridden by platform * code to pick a suitable value if none is configured by the bootloader. + * By default this method tries to find a CDMM-specific node in the system + * dtb. Note that this won't work for early serial console. */ phys_addr_t __weak mips_cdmm_phys_base(void) { + struct device_node *np; + struct resource res; + int err; + + np = of_find_compatible_node(NULL, NULL, "mti,mips-cdmm"); + if (np) { + err = of_address_to_resource(np, 0, &res); + if (!err) + return res.start; + } + return 0; }
--
2.26.2