From: Serge Semin <Sergey.Semin@baikalelectronics.ru>
To: Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
Thomas Gleixner <tglx@linutronix.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Serge Semin <fancer.lancer@gmail.com>
Cc: Serge Semin <Sergey.Semin@baikalelectronics.ru>,
Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>,
Paul Burton <paul.burton@imgtec.com>,
Rob Herring <robh+dt@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
Jason Cooper <jason@lakedaemon.net>,
Marc Zyngier <maz@kernel.org>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Daniel Lezcano <daniel.lezcano@linaro.org>,
James Hogan <jhogan@kernel.org>, <linux-mips@vger.kernel.org>,
<devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Subject: [PATCH 4/6] mips: cdmm: Add mti,mips-cdmm dtb node support
Date: Tue, 26 May 2020 17:02:41 +0300 [thread overview]
Message-ID: <20200526140243.21946-5-Sergey.Semin@baikalelectronics.ru> (raw)
In-Reply-To: <20200526140243.21946-1-Sergey.Semin@baikalelectronics.ru>
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 <Sergey.Semin@baikalelectronics.ru>
---
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
next prev parent reply other threads:[~2020-05-26 14:03 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-26 14:02 [PATCH 0/6] mips: Add DT bindings for MIPS CDMM and GIC Serge Semin
2020-05-26 14:02 ` [PATCH 1/6] dt-bindings: power: Convert mti,mips-cpc to DT schema Serge Semin
2020-05-26 14:02 ` [PATCH 2/6] dt-bindings: interrupt-controller: Convert mti,gic " Serge Semin
2020-05-26 14:02 ` [PATCH 3/6] dt-bindings: bus: Add MIPS CDMM controller Serge Semin
2020-05-26 14:02 ` Serge Semin [this message]
2020-05-26 14:02 ` [PATCH 5/6] bus: cdmm: Add MIPS R5 arch support Serge Semin
2020-05-26 14:02 ` [PATCH 6/6] MAINTAINERS: Add maintainers for MIPS core drivers Serge Semin
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