[PATCH 0/8] ARM: shmobile: move DMAC configuration data in the driver

[PATCH 0/8] ARM: shmobile: move DMAC configuration data in the driver

[Guennadi Liakhovetski]

Currently DMACs on sh-, r-mobile and r-car SoCs use platform data for 
their configuration. This doesn't work well with DT. Adding the complete 
DMAC configuration to DT wouldn't make sense either, because it would 
produce duplication, it would be difficult to define future-safe bindings, 
that wouldn't have to change with any future DMAC versions, and it is 
unneeded, because all that configuration is SoC-specific, not board- 
specific.

The best option is to move that configuration data to the driver, to be 
used, depending on the device ID. Then this data can be re-used in DT- 
and non-DT configurations.

This patch set extends the driver, adds example configuration data sets 
for 2 SoCs. One of those SoCs already had DMAC support, so, it is switched 
over. The other SoC didn't include support for DMAC yet, it is added in 
this series too. Patches 1-3 are common for DT- and non-DT cases, patches 
4 and 5 handle the "traditional" non-DT case, and patches 6-8 deal with DT.

The DMA part applies on top of my earlier shdma patch "DMA: shdma: support 
the new CHCLR register layout" and other patches, already in -next. The 
ARM part applies on top of today's renesas.git devel branch.

Cc: Guennadi Liakhovetski <g.liakhovetski+renesas@gmail.com>

Guennadi Liakhovetski (8):
  DMA: shdma: add support for DMAC configuration data, supplied via
    device ID
  DMA: shdma: add r8a7740 DMAC data to the device ID table
  DMA: shdma: add r8a73a4 DMAC data to the device ID table
  ARM: shmobile: r8a73a4: add a DMAC platform device and clock for it
  ARM: shmobile: r8a7740: switch DMAC controllers to using device ID
    data
  DMA: shdma: pass SoC-specific configuration to the driver via OF
    matching
  DMA: shdma: make multiplexer platform data optional
  ARM: shmobile: r8a7740: add DT nodes and clock aliases for three DMAC
    instances

 Documentation/devicetree/bindings/dma/shdma.txt |    7 +-
 arch/arm/boot/dts/r8a7740.dtsi                  |   61 +++++++++++++
 arch/arm/mach-shmobile/clock-r8a73a4.c          |    4 +-
 arch/arm/mach-shmobile/clock-r8a7740.c          |    9 ++-
 arch/arm/mach-shmobile/include/mach/r8a73a4.h   |    9 ++
 arch/arm/mach-shmobile/setup-r8a73a4.c          |   16 ++++
 arch/arm/mach-shmobile/setup-r8a7740.c          |  106 +----------------------
 drivers/dma/sh/Kconfig                          |    8 ++
 drivers/dma/sh/Makefile                         |    4 +
 drivers/dma/sh/shdma-of.c                       |    3 -
 drivers/dma/sh/shdma-r8a73a4.c                  |   75 ++++++++++++++++
 drivers/dma/sh/shdma-r8a7740.c                  |   95 ++++++++++++++++++++
 drivers/dma/sh/shdma.h                          |   14 +++
 drivers/dma/sh/{shdma.c => shdmac.c}            |   28 +++++-
 14 files changed, 322 insertions(+), 117 deletions(-)
 create mode 100644 drivers/dma/sh/shdma-r8a73a4.c
 create mode 100644 drivers/dma/sh/shdma-r8a7740.c
 rename drivers/dma/sh/{shdma.c => shdmac.c} (97%)

-- 
1.7.2.5

Thanks
Guennadi
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/

[PATCH 1/8] DMA: shdma: add support for DMAC configuration data, supplied via device ID

[Guennadi Liakhovetski]

This is going to facilitate DT support by eliminating the need in AUXDATA
and avoiding creating complex DT data. This also fits well with DMAC
devices, because SoCs with them often have multiple identical DMAC
instances and it is perfectly valid to use a single configuration data set
for all of them.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski+renesas@gmail.com>
---

A file has to be renamed to preserve the driver module name.

 drivers/dma/sh/Makefile              |    2 ++
 drivers/dma/sh/{shdma.c => shdmac.c} |   11 ++++++++++-
 2 files changed, 12 insertions(+), 1 deletions(-)
 rename drivers/dma/sh/{shdma.c => shdmac.c} (98%)

diff --git a/drivers/dma/sh/Makefile b/drivers/dma/sh/Makefile
index c962138..893ee09 100644
--- a/drivers/dma/sh/Makefile
+++ b/drivers/dma/sh/Makefile
@@ -1,3 +1,5 @@
 obj-$(CONFIG_SH_DMAE_BASE) += shdma-base.o shdma-of.o
 obj-$(CONFIG_SH_DMAE) += shdma.o
+shdma-y := shdmac.o
+shdma-objs := $(shdma-y)
 obj-$(CONFIG_SUDMAC) += sudmac.o
diff --git a/drivers/dma/sh/shdma.c b/drivers/dma/sh/shdmac.c
similarity index 98%
rename from drivers/dma/sh/shdma.c
rename to drivers/dma/sh/shdmac.c
index 0e9b719..3c5634e 100644
--- a/drivers/dma/sh/shdma.c
+++ b/drivers/dma/sh/shdmac.c
@@ -667,7 +667,7 @@ static const struct shdma_ops sh_dmae_shdma_ops = {
 
 static int sh_dmae_probe(struct platform_device *pdev)
 {
-	struct sh_dmae_pdata *pdata = pdev->dev.platform_data;
+	struct sh_dmae_pdata *pdata;
 	unsigned long irqflags = IRQF_DISABLED,
 		chan_flag[SH_DMAE_MAX_CHANNELS] = {};
 	int errirq, chan_irq[SH_DMAE_MAX_CHANNELS];
@@ -676,6 +676,8 @@ static int sh_dmae_probe(struct platform_device *pdev)
 	struct dma_device *dma_dev;
 	struct resource *chan, *dmars, *errirq_res, *chanirq_res;
 
+	pdata = (void *)pdev->id_entry->driver_data ? : pdev->dev.platform_data;
+
 	/* get platform data */
 	if (!pdata || !pdata->channel_num)
 		return -ENODEV;
@@ -919,6 +921,12 @@ static const struct of_device_id sh_dmae_of_match[] = {
 };
 MODULE_DEVICE_TABLE(of, sh_dmae_of_match);
 
+const struct platform_device_id sh_dmae_id_table[] = {
+	{.name = SH_DMAE_DRV_NAME,},
+	{}
+};
+MODULE_DEVICE_TABLE(platform, sh_dmae_id_table);
+
 static struct platform_driver sh_dmae_driver = {
 	.driver 	= {
 		.owner	= THIS_MODULE,
@@ -928,6 +936,7 @@ static struct platform_driver sh_dmae_driver = {
 	},
 	.remove		= sh_dmae_remove,
 	.shutdown	= sh_dmae_shutdown,
+	.id_table	= sh_dmae_id_table,
 };
 
 static int __init sh_dmae_init(void)
-- 
1.7.2.5

[PATCH 2/8] DMA: shdma: add r8a7740 DMAC data to the device ID table

[Guennadi Liakhovetski]

This configuration data will be re-used, when DMAC DT support is added to
r8a7740, DMAC platform data in setup-r8a7740.c will be removed.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski+renesas@gmail.com>
---
 drivers/dma/sh/Kconfig         |    4 ++
 drivers/dma/sh/Makefile        |    1 +
 drivers/dma/sh/shdma-r8a7740.c |   95 ++++++++++++++++++++++++++++++++++++++++
 drivers/dma/sh/shdma.h         |    7 +++
 drivers/dma/sh/shdmac.c        |    1 +
 5 files changed, 108 insertions(+), 0 deletions(-)
 create mode 100644 drivers/dma/sh/shdma-r8a7740.c

diff --git a/drivers/dma/sh/Kconfig b/drivers/dma/sh/Kconfig
index 5c1dee2..0ac3e94 100644
--- a/drivers/dma/sh/Kconfig
+++ b/drivers/dma/sh/Kconfig
@@ -22,3 +22,7 @@ config SUDMAC
 	depends on SH_DMAE_BASE
 	help
 	  Enable support for the Renesas SUDMAC controllers.
+
+config SHDMA_R8A7740
+	def_bool y
+	depends on ARCH_R8A7740 && SH_DMAE != n
diff --git a/drivers/dma/sh/Makefile b/drivers/dma/sh/Makefile
index 893ee09..acdd3cb 100644
--- a/drivers/dma/sh/Makefile
+++ b/drivers/dma/sh/Makefile
@@ -1,5 +1,6 @@
 obj-$(CONFIG_SH_DMAE_BASE) += shdma-base.o shdma-of.o
 obj-$(CONFIG_SH_DMAE) += shdma.o
 shdma-y := shdmac.o
+shdma-$(CONFIG_SHDMA_R8A7740) += shdma-r8a7740.o
 shdma-objs := $(shdma-y)
 obj-$(CONFIG_SUDMAC) += sudmac.o
diff --git a/drivers/dma/sh/shdma-r8a7740.c b/drivers/dma/sh/shdma-r8a7740.c
new file mode 100644
index 0000000..2597e2c
--- /dev/null
+++ b/drivers/dma/sh/shdma-r8a7740.c
@@ -0,0 +1,95 @@
+#include <linux/sh_dma.h>
+
+#include <mach/dma-register.h>
+#include <mach/r8a7740.h>
+
+static const struct sh_dmae_slave_config r8a7740_dmae_slaves[] = {
+	{
+		.slave_id	= SHDMA_SLAVE_SDHI0_TX,
+		.addr		= 0xe6850030,
+		.chcr		= CHCR_TX(XMIT_SZ_16BIT),
+		.mid_rid	= 0xc1,
+	}, {
+		.slave_id	= SHDMA_SLAVE_SDHI0_RX,
+		.addr		= 0xe6850030,
+		.chcr		= CHCR_RX(XMIT_SZ_16BIT),
+		.mid_rid	= 0xc2,
+	}, {
+		.slave_id	= SHDMA_SLAVE_SDHI1_TX,
+		.addr		= 0xe6860030,
+		.chcr		= CHCR_TX(XMIT_SZ_16BIT),
+		.mid_rid	= 0xc9,
+	}, {
+		.slave_id	= SHDMA_SLAVE_SDHI1_RX,
+		.addr		= 0xe6860030,
+		.chcr		= CHCR_RX(XMIT_SZ_16BIT),
+		.mid_rid	= 0xca,
+	}, {
+		.slave_id	= SHDMA_SLAVE_SDHI2_TX,
+		.addr		= 0xe6870030,
+		.chcr		= CHCR_TX(XMIT_SZ_16BIT),
+		.mid_rid	= 0xcd,
+	}, {
+		.slave_id	= SHDMA_SLAVE_SDHI2_RX,
+		.addr		= 0xe6870030,
+		.chcr		= CHCR_RX(XMIT_SZ_16BIT),
+		.mid_rid	= 0xce,
+	}, {
+		.slave_id	= SHDMA_SLAVE_FSIA_TX,
+		.addr		= 0xfe1f0024,
+		.chcr		= CHCR_TX(XMIT_SZ_32BIT),
+		.mid_rid	= 0xb1,
+	}, {
+		.slave_id	= SHDMA_SLAVE_FSIA_RX,
+		.addr		= 0xfe1f0020,
+		.chcr		= CHCR_RX(XMIT_SZ_32BIT),
+		.mid_rid	= 0xb2,
+	}, {
+		.slave_id	= SHDMA_SLAVE_FSIB_TX,
+		.addr		= 0xfe1f0064,
+		.chcr		= CHCR_TX(XMIT_SZ_32BIT),
+		.mid_rid	= 0xb5,
+	}, {
+		.slave_id	= SHDMA_SLAVE_MMCIF_TX,
+		.addr		= 0xe6bd0034,
+		.chcr		= CHCR_TX(XMIT_SZ_32BIT),
+		.mid_rid	= 0xd1,
+	}, {
+		.slave_id	= SHDMA_SLAVE_MMCIF_RX,
+		.addr		= 0xe6bd0034,
+		.chcr		= CHCR_RX(XMIT_SZ_32BIT),
+		.mid_rid	= 0xd2,
+	},
+};
+
+#define DMA_CHANNEL(a, b, c)			\
+{						\
+	.offset		= a,			\
+	.dmars		= b,			\
+	.dmars_bit	= c,			\
+	.chclr_offset	= (0x220 - 0x20) + a	\
+}
+
+static const struct sh_dmae_channel r8a7740_dmae_channels[] = {
+	DMA_CHANNEL(0x00, 0, 0),
+	DMA_CHANNEL(0x10, 0, 8),
+	DMA_CHANNEL(0x20, 4, 0),
+	DMA_CHANNEL(0x30, 4, 8),
+	DMA_CHANNEL(0x50, 8, 0),
+	DMA_CHANNEL(0x60, 8, 8),
+};
+
+struct sh_dmae_pdata r8a7740_dma_pdata = {
+	.slave		= r8a7740_dmae_slaves,
+	.slave_num	= ARRAY_SIZE(r8a7740_dmae_slaves),
+	.channel	= r8a7740_dmae_channels,
+	.channel_num	= ARRAY_SIZE(r8a7740_dmae_channels),
+	.ts_low_shift	= TS_LOW_SHIFT,
+	.ts_low_mask	= TS_LOW_BIT << TS_LOW_SHIFT,
+	.ts_high_shift	= TS_HI_SHIFT,
+	.ts_high_mask	= TS_HI_BIT << TS_HI_SHIFT,
+	.ts_shift	= dma_ts_shift,
+	.ts_shift_num	= ARRAY_SIZE(dma_ts_shift),
+	.dmaor_init	= DMAOR_DME,
+	.chclr_present	= 1,
+};
diff --git a/drivers/dma/sh/shdma.h b/drivers/dma/sh/shdma.h
index 06aae6e..b5fe545 100644
--- a/drivers/dma/sh/shdma.h
+++ b/drivers/dma/sh/shdma.h
@@ -61,4 +61,11 @@ struct sh_dmae_desc {
 #define to_sh_dev(chan) container_of(chan->shdma_chan.dma_chan.device,\
 				     struct sh_dmae_device, shdma_dev.dma_dev)
 
+#ifdef CONFIG_SHDMA_R8A7740
+extern struct sh_dmae_pdata r8a7740_dma_pdata;
+#define r8a7740_shdma_devid &r8a7740_dma_pdata
+#else
+#define r8a7740_shdma_devid NULL
+#endif
+
 #endif	/* __DMA_SHDMA_H */
diff --git a/drivers/dma/sh/shdmac.c b/drivers/dma/sh/shdmac.c
index 3c5634e..9e724ae 100644
--- a/drivers/dma/sh/shdmac.c
+++ b/drivers/dma/sh/shdmac.c
@@ -923,6 +923,7 @@ MODULE_DEVICE_TABLE(of, sh_dmae_of_match);
 
 const struct platform_device_id sh_dmae_id_table[] = {
 	{.name = SH_DMAE_DRV_NAME,},
+	{.name = "shdma-r8a7740", .driver_data = (kernel_ulong_t)r8a7740_shdma_devid,},
 	{}
 };
 MODULE_DEVICE_TABLE(platform, sh_dmae_id_table);
-- 
1.7.2.5

[PATCH 3/8] DMA: shdma: add r8a73a4 DMAC data to the device ID table

[Guennadi Liakhovetski]

This configuration data will be re-used, when DMAC DT support is added to
r8a73a4.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski+renesas@gmail.com>
---
 drivers/dma/sh/Kconfig         |    4 ++
 drivers/dma/sh/Makefile        |    1 +
 drivers/dma/sh/shdma-r8a73a4.c |   75 ++++++++++++++++++++++++++++++++++++++++
 drivers/dma/sh/shdma.h         |    7 ++++
 drivers/dma/sh/shdmac.c        |    1 +
 5 files changed, 88 insertions(+), 0 deletions(-)
 create mode 100644 drivers/dma/sh/shdma-r8a73a4.c

diff --git a/drivers/dma/sh/Kconfig b/drivers/dma/sh/Kconfig
index 0ac3e94..6921ba2 100644
--- a/drivers/dma/sh/Kconfig
+++ b/drivers/dma/sh/Kconfig
@@ -23,6 +23,10 @@ config SUDMAC
 	help
 	  Enable support for the Renesas SUDMAC controllers.
 
+config SHDMA_R8A73A4
+	def_bool y
+	depends on ARCH_R8A73A4 && SH_DMAE != n
+
 config SHDMA_R8A7740
 	def_bool y
 	depends on ARCH_R8A7740 && SH_DMAE != n
diff --git a/drivers/dma/sh/Makefile b/drivers/dma/sh/Makefile
index acdd3cb..e08489c 100644
--- a/drivers/dma/sh/Makefile
+++ b/drivers/dma/sh/Makefile
@@ -2,5 +2,6 @@ obj-$(CONFIG_SH_DMAE_BASE) += shdma-base.o shdma-of.o
 obj-$(CONFIG_SH_DMAE) += shdma.o
 shdma-y := shdmac.o
 shdma-$(CONFIG_SHDMA_R8A7740) += shdma-r8a7740.o
+shdma-$(CONFIG_SHDMA_R8A73A4) += shdma-r8a73a4.o
 shdma-objs := $(shdma-y)
 obj-$(CONFIG_SUDMAC) += sudmac.o
diff --git a/drivers/dma/sh/shdma-r8a73a4.c b/drivers/dma/sh/shdma-r8a73a4.c
new file mode 100644
index 0000000..d3b759d
--- /dev/null
+++ b/drivers/dma/sh/shdma-r8a73a4.c
@@ -0,0 +1,75 @@
+#include <linux/sh_dma.h>
+
+#include <mach/dma-register.h>
+#include <mach/r8a73a4.h>
+
+static const struct sh_dmae_slave_config dma_slaves[] = {
+	{
+		.slave_id	= SHDMA_SLAVE_MMCIF0_TX,
+		.addr		= 0xee200034,
+		.chcr		= CHCR_TX(XMIT_SZ_32BIT),
+		.mid_rid	= 0xd1,
+	}, {
+		.slave_id	= SHDMA_SLAVE_MMCIF0_RX,
+		.addr		= 0xee200034,
+		.chcr		= CHCR_RX(XMIT_SZ_32BIT),
+		.mid_rid	= 0xd2,
+	}, {
+		.slave_id	= SHDMA_SLAVE_MMCIF1_TX,
+		.addr		= 0xee220034,
+		.chcr		= CHCR_TX(XMIT_SZ_32BIT),
+		.mid_rid	= 0xe1,
+	}, {
+		.slave_id	= SHDMA_SLAVE_MMCIF1_RX,
+		.addr		= 0xee220034,
+		.chcr		= CHCR_RX(XMIT_SZ_32BIT),
+		.mid_rid	= 0xe2,
+	},
+};
+
+#define DMAE_CHANNEL(a, b)				\
+	{						\
+		.offset         = (a) - 0x20,		\
+		.dmars          = (a) - 0x20 + 0x40,	\
+		.chclr_bit	= (b),			\
+		.chclr_offset	= 0x80 - 0x20,		\
+	}
+
+static const struct sh_dmae_channel dma_channels[] = {
+	DMAE_CHANNEL(0x8000, 0),
+	DMAE_CHANNEL(0x8080, 1),
+	DMAE_CHANNEL(0x8100, 2),
+	DMAE_CHANNEL(0x8180, 3),
+	DMAE_CHANNEL(0x8200, 4),
+	DMAE_CHANNEL(0x8280, 5),
+	DMAE_CHANNEL(0x8300, 6),
+	DMAE_CHANNEL(0x8380, 7),
+	DMAE_CHANNEL(0x8400, 8),
+	DMAE_CHANNEL(0x8480, 9),
+	DMAE_CHANNEL(0x8500, 10),
+	DMAE_CHANNEL(0x8580, 11),
+	DMAE_CHANNEL(0x8600, 12),
+	DMAE_CHANNEL(0x8680, 13),
+	DMAE_CHANNEL(0x8700, 14),
+	DMAE_CHANNEL(0x8780, 15),
+	DMAE_CHANNEL(0x8800, 16),
+	DMAE_CHANNEL(0x8880, 17),
+	DMAE_CHANNEL(0x8900, 18),
+	DMAE_CHANNEL(0x8980, 19),
+};
+
+struct sh_dmae_pdata r8a73a4_dma_pdata = {
+	.slave		= dma_slaves,
+	.slave_num	= ARRAY_SIZE(dma_slaves),
+	.channel	= dma_channels,
+	.channel_num	= ARRAY_SIZE(dma_channels),
+	.ts_low_shift	= TS_LOW_SHIFT,
+	.ts_low_mask	= TS_LOW_BIT << TS_LOW_SHIFT,
+	.ts_high_shift	= TS_HI_SHIFT,
+	.ts_high_mask	= TS_HI_BIT << TS_HI_SHIFT,
+	.ts_shift	= dma_ts_shift,
+	.ts_shift_num	= ARRAY_SIZE(dma_ts_shift),
+	.dmaor_init     = DMAOR_DME,
+	.chclr_present	= 1,
+	.chclr_bitwise	= 1,
+};
diff --git a/drivers/dma/sh/shdma.h b/drivers/dma/sh/shdma.h
index b5fe545..82a83f8 100644
--- a/drivers/dma/sh/shdma.h
+++ b/drivers/dma/sh/shdma.h
@@ -61,6 +61,13 @@ struct sh_dmae_desc {
 #define to_sh_dev(chan) container_of(chan->shdma_chan.dma_chan.device,\
 				     struct sh_dmae_device, shdma_dev.dma_dev)
 
+#ifdef CONFIG_SHDMA_R8A73A4
+extern struct sh_dmae_pdata r8a73a4_dma_pdata;
+#define r8a73a4_shdma_devid &r8a73a4_dma_pdata
+#else
+#define r8a73a4_shdma_devid NULL
+#endif
+
 #ifdef CONFIG_SHDMA_R8A7740
 extern struct sh_dmae_pdata r8a7740_dma_pdata;
 #define r8a7740_shdma_devid &r8a7740_dma_pdata
diff --git a/drivers/dma/sh/shdmac.c b/drivers/dma/sh/shdmac.c
index 9e724ae..a6d53fa 100644
--- a/drivers/dma/sh/shdmac.c
+++ b/drivers/dma/sh/shdmac.c
@@ -923,6 +923,7 @@ MODULE_DEVICE_TABLE(of, sh_dmae_of_match);
 
 const struct platform_device_id sh_dmae_id_table[] = {
 	{.name = SH_DMAE_DRV_NAME,},
+	{.name = "shdma-r8a73a4", .driver_data = (kernel_ulong_t)r8a73a4_shdma_devid,},
 	{.name = "shdma-r8a7740", .driver_data = (kernel_ulong_t)r8a7740_shdma_devid,},
 	{}
 };
-- 
1.7.2.5

[PATCH 4/8] ARM: shmobile: r8a73a4: add a DMAC platform device and clock for it

[Guennadi Liakhovetski]

Add a DMAC platform device and clock definitions for it on r8a73a4.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski+renesas@gmail.com>
---

Simon: this patch supersedes my earlier patch "ARM: shmobile: r8a73a4: add 
a DMAC platform device and clock for it". With this approach we also don't 
have a build dependency on the DMA tree: the configuration data now 
belongs to the driver and will also go via the DMA tree. This patch can be 
applied independently, it just won't work until the driver is updated.

 arch/arm/mach-shmobile/clock-r8a73a4.c        |    4 +++-
 arch/arm/mach-shmobile/include/mach/r8a73a4.h |    9 +++++++++
 arch/arm/mach-shmobile/setup-r8a73a4.c        |   16 ++++++++++++++++
 3 files changed, 28 insertions(+), 1 deletions(-)

diff --git a/arch/arm/mach-shmobile/clock-r8a73a4.c b/arch/arm/mach-shmobile/clock-r8a73a4.c
index 8ea5ef6..cd62b11 100644
--- a/arch/arm/mach-shmobile/clock-r8a73a4.c
+++ b/arch/arm/mach-shmobile/clock-r8a73a4.c
@@ -504,7 +504,7 @@ static struct clk div6_clks[DIV6_NR] = {
 
 /* MSTP */
 enum {
-	MSTP217, MSTP216, MSTP207, MSTP206, MSTP204, MSTP203,
+	MSTP218, MSTP217, MSTP216, MSTP207, MSTP206, MSTP204, MSTP203,
 	MSTP329, MSTP323, MSTP318, MSTP317, MSTP316,
 	MSTP315, MSTP314, MSTP313, MSTP312, MSTP305, MSTP300,
 	MSTP411, MSTP410, MSTP409,
@@ -519,6 +519,7 @@ static struct clk mstp_clks[MSTP_NR] = {
 	[MSTP207] = SH_CLK_MSTP32(&div6_clks[DIV6_MP],	SMSTPCR2, 7, 0), /* SCIFB1 */
 	[MSTP216] = SH_CLK_MSTP32(&div6_clks[DIV6_MP],	SMSTPCR2, 16, 0), /* SCIFB2 */
 	[MSTP217] = SH_CLK_MSTP32(&div6_clks[DIV6_MP],	SMSTPCR2, 17, 0), /* SCIFB3 */
+	[MSTP218] = SH_CLK_MSTP32(&div4_clks[DIV4_HP],	SMSTPCR2, 18, 0), /* DMAC */
 	[MSTP300] = SH_CLK_MSTP32(&div4_clks[DIV4_HP],	SMSTPCR3, 0, 0), /* IIC2 */
 	[MSTP305] = SH_CLK_MSTP32(&div6_clks[DIV6_MMC1],SMSTPCR3, 5, 0), /* MMCIF1 */
 	[MSTP312] = SH_CLK_MSTP32(&div6_clks[DIV6_SDHI2],SMSTPCR3, 12, 0), /* SDHI2 */
@@ -578,6 +579,7 @@ static struct clk_lookup lookups[] = {
 	CLKDEV_DEV_ID("sh-sci.3", &mstp_clks[MSTP207]),
 	CLKDEV_DEV_ID("sh-sci.4", &mstp_clks[MSTP216]),
 	CLKDEV_DEV_ID("sh-sci.5", &mstp_clks[MSTP217]),
+	CLKDEV_DEV_ID("shdma-r8a73a4.0", &mstp_clks[MSTP218]),
 	CLKDEV_DEV_ID("rcar_thermal", &mstp_clks[MSTP522]),
 	CLKDEV_DEV_ID("e6520000.i2c", &mstp_clks[MSTP300]),
 	CLKDEV_DEV_ID("sh_mmcif.1", &mstp_clks[MSTP305]),
diff --git a/arch/arm/mach-shmobile/include/mach/r8a73a4.h b/arch/arm/mach-shmobile/include/mach/r8a73a4.h
index f3a9b70..3a0ea48 100644
--- a/arch/arm/mach-shmobile/include/mach/r8a73a4.h
+++ b/arch/arm/mach-shmobile/include/mach/r8a73a4.h
@@ -1,6 +1,15 @@
 #ifndef __ASM_R8A73A4_H__
 #define __ASM_R8A73A4_H__
 
+/* DMA slave IDs */
+enum {
+	SHDMA_SLAVE_INVALID,
+	SHDMA_SLAVE_MMCIF0_TX,
+	SHDMA_SLAVE_MMCIF0_RX,
+	SHDMA_SLAVE_MMCIF1_TX,
+	SHDMA_SLAVE_MMCIF1_RX,
+};
+
 void r8a73a4_add_standard_devices(void);
 void r8a73a4_add_dt_devices(void);
 void r8a73a4_clock_init(void);
diff --git a/arch/arm/mach-shmobile/setup-r8a73a4.c b/arch/arm/mach-shmobile/setup-r8a73a4.c
index 630ea4e..86af8b1 100644
--- a/arch/arm/mach-shmobile/setup-r8a73a4.c
+++ b/arch/arm/mach-shmobile/setup-r8a73a4.c
@@ -199,6 +199,22 @@ void __init r8a73a4_add_dt_devices(void)
 	r8a7790_register_cmt(10);
 }
 
+/* DMA */
+static struct resource dma_resources[] = {
+	DEFINE_RES_MEM(0xe6700020, 0x89e0),
+	DEFINE_RES_IRQ_NAMED(gic_spi(220), "error_irq"),
+	{
+		/* IRQ for channels 0-19 */
+		.start  = gic_spi(200),
+		.end    = gic_spi(219),
+		.flags  = IORESOURCE_IRQ,
+	},
+};
+
+#define r8a73a4_register_dmac()							\
+	platform_device_register_simple("shdma-r8a73a4", 0,			\
+				dma_resources, ARRAY_SIZE(dma_resources))
+
 void __init r8a73a4_add_standard_devices(void)
 {
 	r8a73a4_add_dt_devices();
-- 
1.7.2.5

[PATCH 5/8] ARM: shmobile: r8a7740: switch DMAC controllers to using device ID data

[Guennadi Liakhovetski]

This patch removes DMAC platform data on r8a7740 and switches to using
device ID data.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski+renesas@gmail.com>
---

Simon: this patch should only be applied after DMA driver changes, 
otherwise DMA on r8a7740 will be broken. We can delay this patch 
for one more kernel version, there is no rush with it, unless we 
want to enable DMA DT on r8a7740 ASAP.

 arch/arm/mach-shmobile/clock-r8a7740.c |    6 +-
 arch/arm/mach-shmobile/setup-r8a7740.c |  106 +-------------------------------
 2 files changed, 6 insertions(+), 106 deletions(-)

diff --git a/arch/arm/mach-shmobile/clock-r8a7740.c b/arch/arm/mach-shmobile/clock-r8a7740.c
index 7fd32d6..0abe58a 100644
--- a/arch/arm/mach-shmobile/clock-r8a7740.c
+++ b/arch/arm/mach-shmobile/clock-r8a7740.c
@@ -575,9 +575,9 @@ static struct clk_lookup lookups[] = {
 	CLKDEV_DEV_ID("sh-sci.5",		&mstp_clks[MSTP207]),
 	CLKDEV_DEV_ID("e6cb0000.sci",		&mstp_clks[MSTP207]),
 	CLKDEV_DEV_ID("sh-dma-engine.3",	&mstp_clks[MSTP214]),
-	CLKDEV_DEV_ID("sh-dma-engine.2",	&mstp_clks[MSTP216]),
-	CLKDEV_DEV_ID("sh-dma-engine.1",	&mstp_clks[MSTP217]),
-	CLKDEV_DEV_ID("sh-dma-engine.0",	&mstp_clks[MSTP218]),
+	CLKDEV_DEV_ID("shdma-r8a7740.2",	&mstp_clks[MSTP216]),
+	CLKDEV_DEV_ID("shdma-r8a7740.1",	&mstp_clks[MSTP217]),
+	CLKDEV_DEV_ID("shdma-r8a7740.0",	&mstp_clks[MSTP218]),
 	CLKDEV_DEV_ID("sh-sci.7",		&mstp_clks[MSTP222]),
 	CLKDEV_DEV_ID("e6cd0000.sci",		&mstp_clks[MSTP222]),
 	CLKDEV_DEV_ID("sh-sci.6",		&mstp_clks[MSTP230]),
diff --git a/arch/arm/mach-shmobile/setup-r8a7740.c b/arch/arm/mach-shmobile/setup-r8a7740.c
index 84c5bb6..01dcb3b 100644
--- a/arch/arm/mach-shmobile/setup-r8a7740.c
+++ b/arch/arm/mach-shmobile/setup-r8a7740.c
@@ -542,97 +542,6 @@ static struct platform_device *r8a7740_early_devices[] __initdata = {
 };
 
 /* DMA */
-static const struct sh_dmae_slave_config r8a7740_dmae_slaves[] = {
-	{
-		.slave_id	= SHDMA_SLAVE_SDHI0_TX,
-		.addr		= 0xe6850030,
-		.chcr		= CHCR_TX(XMIT_SZ_16BIT),
-		.mid_rid	= 0xc1,
-	}, {
-		.slave_id	= SHDMA_SLAVE_SDHI0_RX,
-		.addr		= 0xe6850030,
-		.chcr		= CHCR_RX(XMIT_SZ_16BIT),
-		.mid_rid	= 0xc2,
-	}, {
-		.slave_id	= SHDMA_SLAVE_SDHI1_TX,
-		.addr		= 0xe6860030,
-		.chcr		= CHCR_TX(XMIT_SZ_16BIT),
-		.mid_rid	= 0xc9,
-	}, {
-		.slave_id	= SHDMA_SLAVE_SDHI1_RX,
-		.addr		= 0xe6860030,
-		.chcr		= CHCR_RX(XMIT_SZ_16BIT),
-		.mid_rid	= 0xca,
-	}, {
-		.slave_id	= SHDMA_SLAVE_SDHI2_TX,
-		.addr		= 0xe6870030,
-		.chcr		= CHCR_TX(XMIT_SZ_16BIT),
-		.mid_rid	= 0xcd,
-	}, {
-		.slave_id	= SHDMA_SLAVE_SDHI2_RX,
-		.addr		= 0xe6870030,
-		.chcr		= CHCR_RX(XMIT_SZ_16BIT),
-		.mid_rid	= 0xce,
-	}, {
-		.slave_id	= SHDMA_SLAVE_FSIA_TX,
-		.addr		= 0xfe1f0024,
-		.chcr		= CHCR_TX(XMIT_SZ_32BIT),
-		.mid_rid	= 0xb1,
-	}, {
-		.slave_id	= SHDMA_SLAVE_FSIA_RX,
-		.addr		= 0xfe1f0020,
-		.chcr		= CHCR_RX(XMIT_SZ_32BIT),
-		.mid_rid	= 0xb2,
-	}, {
-		.slave_id	= SHDMA_SLAVE_FSIB_TX,
-		.addr		= 0xfe1f0064,
-		.chcr		= CHCR_TX(XMIT_SZ_32BIT),
-		.mid_rid	= 0xb5,
-	}, {
-		.slave_id	= SHDMA_SLAVE_MMCIF_TX,
-		.addr		= 0xe6bd0034,
-		.chcr		= CHCR_TX(XMIT_SZ_32BIT),
-		.mid_rid	= 0xd1,
-	}, {
-		.slave_id	= SHDMA_SLAVE_MMCIF_RX,
-		.addr		= 0xe6bd0034,
-		.chcr		= CHCR_RX(XMIT_SZ_32BIT),
-		.mid_rid	= 0xd2,
-	},
-};
-
-#define DMA_CHANNEL(a, b, c)			\
-{						\
-	.offset		= a,			\
-	.dmars		= b,			\
-	.dmars_bit	= c,			\
-	.chclr_offset	= (0x220 - 0x20) + a	\
-}
-
-static const struct sh_dmae_channel r8a7740_dmae_channels[] = {
-	DMA_CHANNEL(0x00, 0, 0),
-	DMA_CHANNEL(0x10, 0, 8),
-	DMA_CHANNEL(0x20, 4, 0),
-	DMA_CHANNEL(0x30, 4, 8),
-	DMA_CHANNEL(0x50, 8, 0),
-	DMA_CHANNEL(0x60, 8, 8),
-};
-
-static struct sh_dmae_pdata dma_platform_data = {
-	.slave		= r8a7740_dmae_slaves,
-	.slave_num	= ARRAY_SIZE(r8a7740_dmae_slaves),
-	.channel	= r8a7740_dmae_channels,
-	.channel_num	= ARRAY_SIZE(r8a7740_dmae_channels),
-	.ts_low_shift	= TS_LOW_SHIFT,
-	.ts_low_mask	= TS_LOW_BIT << TS_LOW_SHIFT,
-	.ts_high_shift	= TS_HI_SHIFT,
-	.ts_high_mask	= TS_HI_BIT << TS_HI_SHIFT,
-	.ts_shift	= dma_ts_shift,
-	.ts_shift_num	= ARRAY_SIZE(dma_ts_shift),
-	.dmaor_init	= DMAOR_DME,
-	.chclr_present	= 1,
-};
-
 /* Resource order important! */
 static struct resource r8a7740_dmae0_resources[] = {
 	{
@@ -718,33 +627,24 @@ static struct resource r8a7740_dmae2_resources[] = {
 };
 
 static struct platform_device dma0_device = {
-	.name		= "sh-dma-engine",
+	.name		= "shdma-r8a7740",
 	.id		= 0,
 	.resource	= r8a7740_dmae0_resources,
 	.num_resources	= ARRAY_SIZE(r8a7740_dmae0_resources),
-	.dev		= {
-		.platform_data	= &dma_platform_data,
-	},
 };
 
 static struct platform_device dma1_device = {
-	.name		= "sh-dma-engine",
+	.name		= "shdma-r8a7740",
 	.id		= 1,
 	.resource	= r8a7740_dmae1_resources,
 	.num_resources	= ARRAY_SIZE(r8a7740_dmae1_resources),
-	.dev		= {
-		.platform_data	= &dma_platform_data,
-	},
 };
 
 static struct platform_device dma2_device = {
-	.name		= "sh-dma-engine",
+	.name		= "shdma-r8a7740",
 	.id		= 2,
 	.resource	= r8a7740_dmae2_resources,
 	.num_resources	= ARRAY_SIZE(r8a7740_dmae2_resources),
-	.dev		= {
-		.platform_data	= &dma_platform_data,
-	},
 };
 
 /* USB-DMAC */
-- 
1.7.2.5

[PATCH 6/8] DMA: shdma: pass SoC-specific configuration to the driver via OF matching

[Guennadi Liakhovetski]

Similar to the non-DT case, this patch passes SoC-specific configuration
to the driver via device ID matching, instead of platform data.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski+renesas@gmail.com>
---
 Documentation/devicetree/bindings/dma/shdma.txt |    7 +++++--
 drivers/dma/sh/shdmac.c                         |   21 ++++++++++++++-------
 2 files changed, 19 insertions(+), 9 deletions(-)

diff --git a/Documentation/devicetree/bindings/dma/shdma.txt b/Documentation/devicetree/bindings/dma/shdma.txt
index c15994a..7702e35 100644
--- a/Documentation/devicetree/bindings/dma/shdma.txt
+++ b/Documentation/devicetree/bindings/dma/shdma.txt
@@ -22,7 +22,10 @@ Optional properties (currently unused):
 * DMA controller
 
 Required properties:
-- compatible:	should be "renesas,shdma"
+- compatible:	should be one of
+		"renesas,shdma-r8a73a4" for the system DMAC on r8a73a4 SoC
+		"renesas,shdma-r8a7740" for the DMACs (not RTDMAC) on r8a7740
+		"renesas,shdma" for a generic DMAC
 
 Example:
 	dmac: dma-mux0 {
@@ -36,7 +39,7 @@ Example:
 		ranges;
 
 		dma0: shdma@fe008020 {
-			compatible = "renesas,shdma";
+			compatible = "renesas,shdma-r8a7740";
 			reg = <0xfe008020 0x270>,
 				<0xfe009000 0xc>;
 			interrupt-parent = <&gic>;
diff --git a/drivers/dma/sh/shdmac.c b/drivers/dma/sh/shdmac.c
index a6d53fa..b095d74 100644
--- a/drivers/dma/sh/shdmac.c
+++ b/drivers/dma/sh/shdmac.c
@@ -21,6 +21,7 @@
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/of.h>
+#include <linux/of_device.h>
 #include <linux/of_dma.h>
 #include <linux/slab.h>
 #include <linux/interrupt.h>
@@ -665,6 +666,14 @@ static const struct shdma_ops sh_dmae_shdma_ops = {
 	.get_partial = sh_dmae_get_partial,
 };
 
+static const struct of_device_id sh_dmae_of_match[] = {
+	{.compatible = "renesas,shdma",},
+	{.compatible = "renesas,shdma-r8a73a4", .data = r8a73a4_shdma_devid,},
+	{.compatible = "renesas,shdma-r8a7740", .data = r8a7740_shdma_devid,},
+	{ }
+};
+MODULE_DEVICE_TABLE(of, sh_dmae_of_match);
+
 static int sh_dmae_probe(struct platform_device *pdev)
 {
 	struct sh_dmae_pdata *pdata;
@@ -676,7 +685,11 @@ static int sh_dmae_probe(struct platform_device *pdev)
 	struct dma_device *dma_dev;
 	struct resource *chan, *dmars, *errirq_res, *chanirq_res;
 
-	pdata = (void *)pdev->id_entry->driver_data ? : pdev->dev.platform_data;
+	if (pdev->dev.of_node)
+		pdata = of_match_device(sh_dmae_of_match, &pdev->dev)->data;
+	else
+		pdata = (void *)pdev->id_entry->driver_data ? :
+			pdev->dev.platform_data;
 
 	/* get platform data */
 	if (!pdata || !pdata->channel_num)
@@ -915,12 +928,6 @@ static int sh_dmae_remove(struct platform_device *pdev)
 	return 0;
 }
 
-static const struct of_device_id sh_dmae_of_match[] = {
-	{ .compatible = "renesas,shdma", },
-	{ }
-};
-MODULE_DEVICE_TABLE(of, sh_dmae_of_match);
-
 const struct platform_device_id sh_dmae_id_table[] = {
 	{.name = SH_DMAE_DRV_NAME,},
 	{.name = "shdma-r8a73a4", .driver_data = (kernel_ulong_t)r8a73a4_shdma_devid,},
-- 
1.7.2.5

Re: [PATCH 6/8] DMA: shdma: pass SoC-specific configuration to the driver via OF matching

[Sergei Shtylyov]

Hello.

On 07/12/2013 05:43 PM, Guennadi Liakhovetski wrote:

> Similar to the non-DT case, this patch passes SoC-specific configuration
> to the driver via device ID matching, instead of platform data.

> Signed-off-by: Guennadi Liakhovetski <g.liakhovetski+renesas@gmail.com>
[...]

> diff --git a/drivers/dma/sh/shdmac.c b/drivers/dma/sh/shdmac.c
> index a6d53fa..b095d74 100644
> --- a/drivers/dma/sh/shdmac.c
> +++ b/drivers/dma/sh/shdmac.c
[...]
> @@ -665,6 +666,14 @@ static const struct shdma_ops sh_dmae_shdma_ops = {
>   	.get_partial = sh_dmae_get_partial,
>   };
>
> +static const struct of_device_id sh_dmae_of_match[] = {
> +	{.compatible = "renesas,shdma",},
> +	{.compatible = "renesas,shdma-r8a73a4", .data = r8a73a4_shdma_devid,},
> +	{.compatible = "renesas,shdma-r8a7740", .data = r8a7740_shdma_devid,},

    Previously used style assumed spaced after { and before }. Indeed, 
that would be more consistent with the following line.

> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, sh_dmae_of_match);
> +
>   static int sh_dmae_probe(struct platform_device *pdev)
>   {
>   	struct sh_dmae_pdata *pdata;
[...]
> @@ -915,12 +928,6 @@ static int sh_dmae_remove(struct platform_device *pdev)
>   	return 0;
>   }
>
> -static const struct of_device_id sh_dmae_of_match[] = {
> -	{ .compatible = "renesas,shdma", },
> -	{ }
> -};
> -MODULE_DEVICE_TABLE(of, sh_dmae_of_match);
> -

WBR, Sergei

[PATCH 7/8] DMA: shdma: make multiplexer platform data optional

[Guennadi Liakhovetski]

Instead of supplying platform data to the shdma dmaengine driver via
AUXDATA in the DT case, we now support platform data via an OF match table.
Make platform data optional.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski+renesas@gmail.com>
---
 drivers/dma/sh/shdma-of.c |    3 ---
 1 files changed, 0 insertions(+), 3 deletions(-)

diff --git a/drivers/dma/sh/shdma-of.c b/drivers/dma/sh/shdma-of.c
index fd2fa10..e439e53 100644
--- a/drivers/dma/sh/shdma-of.c
+++ b/drivers/dma/sh/shdma-of.c
@@ -46,9 +46,6 @@ static int shdma_of_probe(struct platform_device *pdev)
 	const struct of_dev_auxdata *lookup = pdev->dev.platform_data;
 	int ret;
 
-	if (!lookup)
-		return -EINVAL;
-
 	ret = of_dma_controller_register(pdev->dev.of_node,
 					 shdma_of_xlate, pdev);
 	if (ret < 0)
-- 
1.7.2.5

[PATCH 8/8] ARM: shmobile: r8a7740: add DT nodes and clock aliases for three DMAC instances

[Guennadi Liakhovetski]

This patch adds Device Tree support for the three generic DMA controller
instances on r8a7740 in a DMA multiplexer node.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski+renesas@gmail.com>
---
 arch/arm/boot/dts/r8a7740.dtsi         |   61 ++++++++++++++++++++++++++++++++
 arch/arm/mach-shmobile/clock-r8a7740.c |    3 ++
 2 files changed, 64 insertions(+), 0 deletions(-)

diff --git a/arch/arm/boot/dts/r8a7740.dtsi b/arch/arm/boot/dts/r8a7740.dtsi
index 25dc930..39b596f 100644
--- a/arch/arm/boot/dts/r8a7740.dtsi
+++ b/arch/arm/boot/dts/r8a7740.dtsi
@@ -112,6 +112,67 @@
 			      0 149 0x4>;
 	};
 
+	dmac: dma-mux0 {
+		compatible = "renesas,shdma-mux";
+		#dma-cells = <1>;
+		dma-channels = <6>;
+		dma-requests = <256>;
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges;
+
+		dma0: shdma@fe008020 {
+			compatible = "renesas,shdma-r8a7740";
+			reg = <0xfe008020 0x270>,
+				<0xfe009000 0xc>;
+			interrupt-parent = <&gic>;
+			interrupts = <0 34 4
+					0 28 4
+					0 29 4
+					0 30 4
+					0 31 4
+					0 32 4
+					0 33 4>;
+			interrupt-names = "error",
+					"ch0", "ch1", "ch2", "ch3",
+					"ch4", "ch5";
+		};
+
+		dma1: shdma@fe018020 {
+			compatible = "renesas,shdma-r8a7740";
+			reg = <0xfe018020 0x270>,
+				<0xfe019000 0xc>;
+			interrupt-parent = <&gic>;
+			interrupts = <0 41 4
+					0 35 4
+					0 36 4
+					0 37 4
+					0 38 4
+					0 39 4
+					0 40 4>;
+			interrupt-names = "error",
+					"ch0", "ch1", "ch2", "ch3",
+					"ch4", "ch5";
+		};
+
+		dma2: shdma@fe028020 {
+			compatible = "renesas,shdma-r8a7740";
+			reg = <0xfe028020 0x270>,
+				<0xfe029000 0xc>;
+			interrupt-parent = <&gic>;
+			interrupts = <0 48 4
+					0 42 4
+					0 43 4
+					0 44 4
+					0 45 4
+					0 46 4
+					0 47 4>;
+			interrupt-names = "error",
+					"ch0", "ch1", "ch2", "ch3",
+					"ch4", "ch5";
+		};
+	};
+
 	i2c0: i2c@fff20000 {
 		#address-cells = <1>;
 		#size-cells = <0>;
diff --git a/arch/arm/mach-shmobile/clock-r8a7740.c b/arch/arm/mach-shmobile/clock-r8a7740.c
index 0abe58a..38ce209 100644
--- a/arch/arm/mach-shmobile/clock-r8a7740.c
+++ b/arch/arm/mach-shmobile/clock-r8a7740.c
@@ -576,8 +576,11 @@ static struct clk_lookup lookups[] = {
 	CLKDEV_DEV_ID("e6cb0000.sci",		&mstp_clks[MSTP207]),
 	CLKDEV_DEV_ID("sh-dma-engine.3",	&mstp_clks[MSTP214]),
 	CLKDEV_DEV_ID("shdma-r8a7740.2",	&mstp_clks[MSTP216]),
+	CLKDEV_DEV_ID("fe028020.shdma",		&mstp_clks[MSTP216]),
 	CLKDEV_DEV_ID("shdma-r8a7740.1",	&mstp_clks[MSTP217]),
+	CLKDEV_DEV_ID("fe018020.shdma",		&mstp_clks[MSTP217]),
 	CLKDEV_DEV_ID("shdma-r8a7740.0",	&mstp_clks[MSTP218]),
+	CLKDEV_DEV_ID("fe008020.shdma",		&mstp_clks[MSTP218]),
 	CLKDEV_DEV_ID("sh-sci.7",		&mstp_clks[MSTP222]),
 	CLKDEV_DEV_ID("e6cd0000.sci",		&mstp_clks[MSTP222]),
 	CLKDEV_DEV_ID("sh-sci.6",		&mstp_clks[MSTP230]),
-- 
1.7.2.5

Re: [PATCH 8/8] ARM: shmobile: r8a7740: add DT nodes and clock aliases for three DMAC instances

[Sergei Shtylyov]

Hello.

On 07/12/2013 05:43 PM, Guennadi Liakhovetski wrote:

> This patch adds Device Tree support for the three generic DMA controller
> instances on r8a7740 in a DMA multiplexer node.

> Signed-off-by: Guennadi Liakhovetski <g.liakhovetski+renesas@gmail.com>
> ---
>   arch/arm/boot/dts/r8a7740.dtsi         |   61 ++++++++++++++++++++++++++++++++
>   arch/arm/mach-shmobile/clock-r8a7740.c |    3 ++
>   2 files changed, 64 insertions(+), 0 deletions(-)

> diff --git a/arch/arm/boot/dts/r8a7740.dtsi b/arch/arm/boot/dts/r8a7740.dtsi
> index 25dc930..39b596f 100644
> --- a/arch/arm/boot/dts/r8a7740.dtsi
> +++ b/arch/arm/boot/dts/r8a7740.dtsi
> @@ -112,6 +112,67 @@
>   			      0 149 0x4>;
>   	};
>
> +	dmac: dma-mux0 {
> +		compatible = "renesas,shdma-mux";
> +		#dma-cells = <1>;
> +		dma-channels = <6>;
> +		dma-requests = <256>;
> +		#address-cells = <1>;
> +		#size-cells = <1>;
> +		ranges;
> +
> +		dma0: shdma@fe008020 {
> +			compatible = "renesas,shdma-r8a7740";
> +			reg = <0xfe008020 0x270>,
> +				<0xfe009000 0xc>;
> +			interrupt-parent = <&gic>;
> +			interrupts = <0 34 4
> +					0 28 4
> +					0 29 4
> +					0 30 4
> +					0 31 4
> +					0 32 4
> +					0 33 4>;
> +			interrupt-names = "error",
> +					"ch0", "ch1", "ch2", "ch3",
> +					"ch4", "ch5";
> +		};
> +
> +		dma1: shdma@fe018020 {
> +			compatible = "renesas,shdma-r8a7740";
> +			reg = <0xfe018020 0x270>,
> +				<0xfe019000 0xc>;
> +			interrupt-parent = <&gic>;
> +			interrupts = <0 41 4
> +					0 35 4
> +					0 36 4
> +					0 37 4
> +					0 38 4
> +					0 39 4
> +					0 40 4>;
> +			interrupt-names = "error",
> +					"ch0", "ch1", "ch2", "ch3",
> +					"ch4", "ch5";
> +		};
> +
> +		dma2: shdma@fe028020 {
> +			compatible = "renesas,shdma-r8a7740";
> +			reg = <0xfe028020 0x270>,
> +				<0xfe029000 0xc>;
> +			interrupt-parent = <&gic>;
> +			interrupts = <0 48 4
> +					0 42 4
> +					0 43 4
> +					0 44 4
> +					0 45 4
> +					0 46 4
> +					0 47 4>;
> +			interrupt-names = "error",
> +					"ch0", "ch1", "ch2", "ch3",
> +					"ch4", "ch5";
> +		};
> +	};
> +

    According to ePAPR [1] section 2.2.2, "the name of the node should 
be somewhat generic, reflecting the function of the device and not its
precise programming model. If appropriate, the name should be one of the 
following choices:
[...]
- dma-controller;
[...]"

[1] http://www.power.org/resources/downloads/Power_ePAPR_APPROVED_v1.0.pdf
  	
WBR, Sergei