[PATCH v2 0/4] Support H3 SPI controller

[PATCH v2 0/4] Support H3 SPI controller

[Milo Kim]

Allwinner H3 SPI controller has same architecture as A31.
So most configuration is identical except one thing - FIFO capacity.

                         A31    H3
------------------------------------
Number of controllers     4      2
Number of FIFO depth     128    64
Transfer bits             8      8

Register maps are sharable, so sun6i SPI driver is reusable with
device configuration.

Tested on Nano Pi M1 and SPI slave device is TI LP8860.

v2:
  Include DTS patches
  Use of_device_get_match_data() helper to get device specific data
  Fix build warning of 64bit CPU architecture
    (warning: cast from pointer to integer of different size
     [-Wpointer-to-int-cast])

Milo Kim (4):
  ARM: dts: sun8i: Add SPI pinctrl node in H3
  ARM: dts: sun8i: Add SPI controller node in H3
  spi: sun6i: Add binding for Allwinner H3 SPI controller
  spi: sun6i: Support Allwinner H3 SPI controller

 .../devicetree/bindings/spi/spi-sun6i.txt          | 25 +++++++++++-
 arch/arm/boot/dts/sun8i-h3.dtsi                    | 46 ++++++++++++++++++++++
 drivers/spi/spi-sun6i.c                            | 18 ++++++---
 3 files changed, 82 insertions(+), 7 deletions(-)

-- 
2.9.3

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[PATCH v2 1/4] ARM: dts: sun8i: Add SPI pinctrl node in H3

[Milo Kim]

H3 supports two SPI controllers. Four pins (MOSI, MISO, SCLK, SS) are
configured through the pinctrl subsystem.

Cc: Maxime Ripard <maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
Cc: Chen-Yu Tsai <wens-jdAy2FN1RRM@public.gmane.org>
Signed-off-by: Milo Kim <woogyom.kim-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 arch/arm/boot/dts/sun8i-h3.dtsi | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/arm/boot/dts/sun8i-h3.dtsi b/arch/arm/boot/dts/sun8i-h3.dtsi
index 75a8654..8a59d8d 100644
--- a/arch/arm/boot/dts/sun8i-h3.dtsi
+++ b/arch/arm/boot/dts/sun8i-h3.dtsi
@@ -381,6 +381,20 @@
 				allwinner,pull = <SUN4I_PINCTRL_NO_PULL>;
 			};
 
+			spi0_pins: spi0 {
+				allwinner,pins = "PC0", "PC1", "PC2", "PC3";
+				allwinner,function = "spi0";
+				allwinner,drive = <SUN4I_PINCTRL_10_MA>;
+				allwinner,pull = <SUN4I_PINCTRL_NO_PULL>;
+			};
+
+			spi1_pins: spi1 {
+				allwinner,pins = "PA15", "PA16", "PA14", "PA13";
+				allwinner,function = "spi1";
+				allwinner,drive = <SUN4I_PINCTRL_10_MA>;
+				allwinner,pull = <SUN4I_PINCTRL_NO_PULL>;
+			};
+
 			uart0_pins_a: uart0@0 {
 				allwinner,pins = "PA4", "PA5";
 				allwinner,function = "uart0";
-- 
2.9.3

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[PATCH v2 2/4] ARM: dts: sun8i: Add SPI controller node in H3

[Milo Kim]

H3 SPI subsystem is almost same as A31 SPI except buffer size, so those
DT properties are reusable.

Cc: Maxime Ripard <maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
Cc: Chen-Yu Tsai <wens-jdAy2FN1RRM@public.gmane.org>
Signed-off-by: Milo Kim <woogyom.kim-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 arch/arm/boot/dts/sun8i-h3.dtsi | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/arch/arm/boot/dts/sun8i-h3.dtsi b/arch/arm/boot/dts/sun8i-h3.dtsi
index 8a59d8d..c38b028 100644
--- a/arch/arm/boot/dts/sun8i-h3.dtsi
+++ b/arch/arm/boot/dts/sun8i-h3.dtsi
@@ -439,6 +439,38 @@
 			clocks = <&osc24M>;
 		};
 
+		spi0: spi@01c68000 {
+			compatible = "allwinner,sun8i-h3-spi";
+			reg = <0x01c68000 0x1000>;
+			interrupts = <GIC_SPI 65 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&ccu CLK_BUS_SPI0>, <&ccu CLK_SPI0>;
+			clock-names = "ahb", "mod";
+			dmas = <&dma 23>, <&dma 23>;
+			dma-names = "rx", "tx";
+			pinctrl-names = "default";
+			pinctrl-0 = <&spi0_pins>;
+			resets = <&ccu RST_BUS_SPI0>;
+			status = "disabled";
+			#address-cells = <1>;
+			#size-cells = <0>;
+		};
+
+		spi1: spi@01c69000 {
+			compatible = "allwinner,sun8i-h3-spi";
+			reg = <0x01c69000 0x1000>;
+			interrupts = <GIC_SPI 66 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&ccu CLK_BUS_SPI1>, <&ccu CLK_SPI1>;
+			clock-names = "ahb", "mod";
+			dmas = <&dma 24>, <&dma 24>;
+			dma-names = "rx", "tx";
+			pinctrl-names = "default";
+			pinctrl-0 = <&spi1_pins>;
+			resets = <&ccu RST_BUS_SPI1>;
+			status = "disabled";
+			#address-cells = <1>;
+			#size-cells = <0>;
+		};
+
 		wdt0: watchdog@01c20ca0 {
 			compatible = "allwinner,sun6i-a31-wdt";
 			reg = <0x01c20ca0 0x20>;
-- 
2.9.3

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[PATCH v2 3/4] spi: sun6i: Add binding for Allwinner H3 SPI controller

[Milo Kim]

H3 SPI has same architecture as A31 except FIFO capacity.
To configure the buffer size separately, compatible property should be
different. Optional DMA specifiers and example are added.

Acked-by: Maxime Ripard <maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
Cc: Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: Chen-Yu Tsai <wens-jdAy2FN1RRM@public.gmane.org>
Signed-off-by: Milo Kim <woogyom.kim-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 .../devicetree/bindings/spi/spi-sun6i.txt          | 25 ++++++++++++++++++++--
 1 file changed, 23 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/spi/spi-sun6i.txt b/Documentation/devicetree/bindings/spi/spi-sun6i.txt
index 21de73d..2ec99b8 100644
--- a/Documentation/devicetree/bindings/spi/spi-sun6i.txt
+++ b/Documentation/devicetree/bindings/spi/spi-sun6i.txt
@@ -1,7 +1,7 @@
-Allwinner A31 SPI controller
+Allwinner A31/H3 SPI controller
 
 Required properties:
-- compatible: Should be "allwinner,sun6i-a31-spi".
+- compatible: Should be "allwinner,sun6i-a31-spi" or "allwinner,sun8i-h3-spi".
 - reg: Should contain register location and length.
 - interrupts: Should contain interrupt.
 - clocks: phandle to the clocks feeding the SPI controller. Two are
@@ -12,6 +12,11 @@ Required properties:
 - resets: phandle to the reset controller asserting this device in
           reset
 
+Optional properties:
+- dmas: DMA specifiers for rx and tx dma. See the DMA client binding,
+	Documentation/devicetree/bindings/dma/dma.txt
+- dma-names: DMA request names should include "rx" and "tx" if present.
+
 Example:
 
 spi1: spi@01c69000 {
@@ -22,3 +27,19 @@ spi1: spi@01c69000 {
 	clock-names = "ahb", "mod";
 	resets = <&ahb1_rst 21>;
 };
+
+spi0: spi@01c68000 {
+	compatible = "allwinner,sun8i-h3-spi";
+	reg = <0x01c68000 0x1000>;
+	interrupts = <GIC_SPI 65 IRQ_TYPE_LEVEL_HIGH>;
+	clocks = <&ccu CLK_BUS_SPI0>, <&ccu CLK_SPI0>;
+	clock-names = "ahb", "mod";
+	dmas = <&dma 23>, <&dma 23>;
+	dma-names = "rx", "tx";
+	pinctrl-names = "default";
+	pinctrl-0 = <&spi0_pins>;
+	resets = <&ccu RST_BUS_SPI0>;
+	status = "disabled";
+	#address-cells = <1>;
+	#size-cells = <0>;
+};
-- 
2.9.3

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[PATCH v2 4/4] spi: sun6i: Support Allwinner H3 SPI controller

[Milo Kim]

H3 has two SPI controllers. The size of the buffer is 64 * 8.
(8 bit transfer by 64 entry FIFO)
A31 has four controllers. The size of the buffer is 128 * 8.
(8 bit transfer by 128 entry FIFO)

Register maps are sharable, so sun6i SPI driver is reusable with
device configuration.

Use the variable, 'fifo_depth' instead of fixed value to support both SPI
controllers.

Cc: Mark Brown <broonie@kernel.org>
Cc: Maxime Ripard <maxime.ripard@free-electrons.com>
Cc: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Milo Kim <woogyom.kim@gmail.com>
---
 drivers/spi/spi-sun6i.c | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/drivers/spi/spi-sun6i.c b/drivers/spi/spi-sun6i.c
index 9918a57..e311483 100644
--- a/drivers/spi/spi-sun6i.c
+++ b/drivers/spi/spi-sun6i.c
@@ -17,6 +17,7 @@
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/module.h>
+#include <linux/of_device.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/reset.h>
@@ -24,6 +25,7 @@
 #include <linux/spi/spi.h>
 
 #define SUN6I_FIFO_DEPTH		128
+#define SUN8I_FIFO_DEPTH		64
 
 #define SUN6I_GBL_CTL_REG		0x04
 #define SUN6I_GBL_CTL_BUS_ENABLE		BIT(0)
@@ -90,6 +92,7 @@ struct sun6i_spi {
 	const u8		*tx_buf;
 	u8			*rx_buf;
 	int			len;
+	unsigned long		fifo_depth;
 };
 
 static inline u32 sun6i_spi_read(struct sun6i_spi *sspi, u32 reg)
@@ -155,7 +158,9 @@ static void sun6i_spi_set_cs(struct spi_device *spi, bool enable)
 
 static size_t sun6i_spi_max_transfer_size(struct spi_device *spi)
 {
-	return SUN6I_FIFO_DEPTH - 1;
+	struct sun6i_spi *sspi = spi_master_get_devdata(spi->master);
+
+	return sspi->fifo_depth - 1;
 }
 
 static int sun6i_spi_transfer_one(struct spi_master *master,
@@ -170,7 +175,7 @@ static int sun6i_spi_transfer_one(struct spi_master *master,
 	u32 reg;
 
 	/* We don't support transfer larger than the FIFO */
-	if (tfr->len > SUN6I_FIFO_DEPTH)
+	if (tfr->len > sspi->fifo_depth)
 		return -EINVAL;
 
 	reinit_completion(&sspi->done);
@@ -265,7 +270,7 @@ static int sun6i_spi_transfer_one(struct spi_master *master,
 			SUN6I_BURST_CTL_CNT_STC(tx_len));
 
 	/* Fill the TX FIFO */
-	sun6i_spi_fill_fifo(sspi, SUN6I_FIFO_DEPTH);
+	sun6i_spi_fill_fifo(sspi, sspi->fifo_depth);
 
 	/* Enable the interrupts */
 	sun6i_spi_write(sspi, SUN6I_INT_CTL_REG, SUN6I_INT_CTL_TC);
@@ -288,7 +293,7 @@ static int sun6i_spi_transfer_one(struct spi_master *master,
 		goto out;
 	}
 
-	sun6i_spi_drain_fifo(sspi, SUN6I_FIFO_DEPTH);
+	sun6i_spi_drain_fifo(sspi, sspi->fifo_depth);
 
 out:
 	sun6i_spi_write(sspi, SUN6I_INT_CTL_REG, 0);
@@ -398,6 +403,8 @@ static int sun6i_spi_probe(struct platform_device *pdev)
 	}
 
 	sspi->master = master;
+	sspi->fifo_depth = (unsigned long)of_device_get_match_data(&pdev->dev);
+
 	master->max_speed_hz = 100 * 1000 * 1000;
 	master->min_speed_hz = 3 * 1000;
 	master->set_cs = sun6i_spi_set_cs;
@@ -470,7 +477,8 @@ static int sun6i_spi_remove(struct platform_device *pdev)
 }
 
 static const struct of_device_id sun6i_spi_match[] = {
-	{ .compatible = "allwinner,sun6i-a31-spi", },
+	{ .compatible = "allwinner,sun6i-a31-spi", .data = (void *)SUN6I_FIFO_DEPTH },
+	{ .compatible = "allwinner,sun8i-h3-spi",  .data = (void *)SUN8I_FIFO_DEPTH },
 	{}
 };
 MODULE_DEVICE_TABLE(of, sun6i_spi_match);
-- 
2.9.3

Re: [PATCH v2 3/4] spi: sun6i: Add binding for Allwinner H3 SPI controller

[Rob Herring]

On Fri, Oct 28, 2016 at 03:54:11PM +0900, Milo Kim wrote:
> H3 SPI has same architecture as A31 except FIFO capacity.
> To configure the buffer size separately, compatible property should be
> different. Optional DMA specifiers and example are added.
> 
> Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
> Cc: Mark Brown <broonie@kernel.org>
> Cc: Rob Herring <robh+dt@kernel.org>
> Cc: Chen-Yu Tsai <wens@csie.org>
> Signed-off-by: Milo Kim <woogyom.kim@gmail.com>
> ---
>  .../devicetree/bindings/spi/spi-sun6i.txt          | 25 ++++++++++++++++++++--
>  1 file changed, 23 insertions(+), 2 deletions(-)

Acked-by: Rob Herring <robh@kernel.org>

Re: [PATCH v2 4/4] spi: sun6i: Support Allwinner H3 SPI controller

[Maxime Ripard]

[-- Attachment #1: Type: text/plain, Size: 828 bytes --]

On Fri, Oct 28, 2016 at 03:54:12PM +0900, Milo Kim wrote:
> H3 has two SPI controllers. The size of the buffer is 64 * 8.
> (8 bit transfer by 64 entry FIFO)
> A31 has four controllers. The size of the buffer is 128 * 8.
> (8 bit transfer by 128 entry FIFO)
> 
> Register maps are sharable, so sun6i SPI driver is reusable with
> device configuration.
> 
> Use the variable, 'fifo_depth' instead of fixed value to support both SPI
> controllers.
> 
> Cc: Mark Brown <broonie@kernel.org>
> Cc: Maxime Ripard <maxime.ripard@free-electrons.com>
> Cc: Chen-Yu Tsai <wens@csie.org>
> Signed-off-by: Milo Kim <woogyom.kim@gmail.com>

Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>

Thanks!
Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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Re: [PATCH v2 2/4] ARM: dts: sun8i: Add SPI controller node in H3

[Maxime Ripard]

[-- Attachment #1: Type: text/plain, Size: 541 bytes --]

1;4600;0c
On Fri, Oct 28, 2016 at 03:54:10PM +0900, Milo Kim wrote:
> H3 SPI subsystem is almost same as A31 SPI except buffer size, so those
> DT properties are reusable.
> 
> Cc: Maxime Ripard <maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
> Cc: Chen-Yu Tsai <wens-jdAy2FN1RRM@public.gmane.org>
> Signed-off-by: Milo Kim <woogyom.kim-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>

Applied both, thanks!
Maxime

-- 
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Embedded Linux and Kernel engineering
http://free-electrons.com

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Applied "spi: sun6i: Support Allwinner H3 SPI controller" to the spi tree

[Mark Brown]

The patch

   spi: sun6i: Support Allwinner H3 SPI controller

has been applied to the spi tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From 10565dfd35488c45826201b4ce28597d6b5de3dd Mon Sep 17 00:00:00 2001
From: Milo Kim <woogyom.kim@gmail.com>
Date: Fri, 28 Oct 2016 15:54:12 +0900
Subject: [PATCH] spi: sun6i: Support Allwinner H3 SPI controller

H3 has two SPI controllers. The size of the buffer is 64 * 8.
(8 bit transfer by 64 entry FIFO)
A31 has four controllers. The size of the buffer is 128 * 8.
(8 bit transfer by 128 entry FIFO)

Register maps are sharable, so sun6i SPI driver is reusable with
device configuration.

Use the variable, 'fifo_depth' instead of fixed value to support both SPI
controllers.

Signed-off-by: Milo Kim <woogyom.kim@gmail.com>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 drivers/spi/spi-sun6i.c | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/drivers/spi/spi-sun6i.c b/drivers/spi/spi-sun6i.c
index 9918a57a6a6e..e3114832c485 100644
--- a/drivers/spi/spi-sun6i.c
+++ b/drivers/spi/spi-sun6i.c
@@ -17,6 +17,7 @@
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/module.h>
+#include <linux/of_device.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/reset.h>
@@ -24,6 +25,7 @@
 #include <linux/spi/spi.h>
 
 #define SUN6I_FIFO_DEPTH		128
+#define SUN8I_FIFO_DEPTH		64
 
 #define SUN6I_GBL_CTL_REG		0x04
 #define SUN6I_GBL_CTL_BUS_ENABLE		BIT(0)
@@ -90,6 +92,7 @@ struct sun6i_spi {
 	const u8		*tx_buf;
 	u8			*rx_buf;
 	int			len;
+	unsigned long		fifo_depth;
 };
 
 static inline u32 sun6i_spi_read(struct sun6i_spi *sspi, u32 reg)
@@ -155,7 +158,9 @@ static void sun6i_spi_set_cs(struct spi_device *spi, bool enable)
 
 static size_t sun6i_spi_max_transfer_size(struct spi_device *spi)
 {
-	return SUN6I_FIFO_DEPTH - 1;
+	struct sun6i_spi *sspi = spi_master_get_devdata(spi->master);
+
+	return sspi->fifo_depth - 1;
 }
 
 static int sun6i_spi_transfer_one(struct spi_master *master,
@@ -170,7 +175,7 @@ static int sun6i_spi_transfer_one(struct spi_master *master,
 	u32 reg;
 
 	/* We don't support transfer larger than the FIFO */
-	if (tfr->len > SUN6I_FIFO_DEPTH)
+	if (tfr->len > sspi->fifo_depth)
 		return -EINVAL;
 
 	reinit_completion(&sspi->done);
@@ -265,7 +270,7 @@ static int sun6i_spi_transfer_one(struct spi_master *master,
 			SUN6I_BURST_CTL_CNT_STC(tx_len));
 
 	/* Fill the TX FIFO */
-	sun6i_spi_fill_fifo(sspi, SUN6I_FIFO_DEPTH);
+	sun6i_spi_fill_fifo(sspi, sspi->fifo_depth);
 
 	/* Enable the interrupts */
 	sun6i_spi_write(sspi, SUN6I_INT_CTL_REG, SUN6I_INT_CTL_TC);
@@ -288,7 +293,7 @@ static int sun6i_spi_transfer_one(struct spi_master *master,
 		goto out;
 	}
 
-	sun6i_spi_drain_fifo(sspi, SUN6I_FIFO_DEPTH);
+	sun6i_spi_drain_fifo(sspi, sspi->fifo_depth);
 
 out:
 	sun6i_spi_write(sspi, SUN6I_INT_CTL_REG, 0);
@@ -398,6 +403,8 @@ static int sun6i_spi_probe(struct platform_device *pdev)
 	}
 
 	sspi->master = master;
+	sspi->fifo_depth = (unsigned long)of_device_get_match_data(&pdev->dev);
+
 	master->max_speed_hz = 100 * 1000 * 1000;
 	master->min_speed_hz = 3 * 1000;
 	master->set_cs = sun6i_spi_set_cs;
@@ -470,7 +477,8 @@ static int sun6i_spi_remove(struct platform_device *pdev)
 }
 
 static const struct of_device_id sun6i_spi_match[] = {
-	{ .compatible = "allwinner,sun6i-a31-spi", },
+	{ .compatible = "allwinner,sun6i-a31-spi", .data = (void *)SUN6I_FIFO_DEPTH },
+	{ .compatible = "allwinner,sun8i-h3-spi",  .data = (void *)SUN8I_FIFO_DEPTH },
 	{}
 };
 MODULE_DEVICE_TABLE(of, sun6i_spi_match);
-- 
2.10.1