[PATCH v4 0/3] Add basic support for the I2C units of the Armada 3700

[PATCH v4 0/3] Add basic support for the I2C units of the Armada 3700

[Romain Perier]

This series add basic support for the I2C bus interface units present
in the Armada 3700 to the pxa-i2c driver. It also add the definitions of
the device nodes to the devicetree at the SoC level and for its official
development board: the Armada 3720 DB.

Romain Perier (3):
  i2c: pxa: Add support for the I2C units found in Armada 3700
  arm64: dts: marvell: Add I2C definitions for the Armada 3700
  dt-bindings: i2c: pxa: Update the documentation for the Armada 3700

 Documentation/devicetree/bindings/i2c/i2c-pxa.txt |  1 +
 arch/arm64/boot/dts/marvell/armada-3720-db.dts    |  4 ++++
 arch/arm64/boot/dts/marvell/armada-37xx.dtsi      | 18 ++++++++++++++++
 drivers/i2c/busses/Kconfig                        |  2 +-
 drivers/i2c/busses/i2c-pxa.c                      | 25 +++++++++++++++++++++--
 5 files changed, 47 insertions(+), 3 deletions(-)

-- 
2.9.3

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[PATCH v4 1/3] i2c: pxa: Add support for the I2C units found in Armada 3700

[Romain Perier]

The Armada 3700 has two I2C controllers that is compliant with the I2C
Bus Specificiation 2.1, supports multi-master and different bus speed:
Standard mode (up to 100 KHz), Fast mode (up to 400 KHz),
High speed mode (up to 3.4 Mhz).

This IP block has a lot of similarity with the PXA, except some register
offsets and bitfield. This commits adds a basic support for this I2C
unit.

Signed-off-by: Romain Perier <romain.perier-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
Tested-by: Gregory CLEMENT <gregory.clement-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---

Changes in v4:
 - Replaced the type of hs_mask and fm_mask by u32, instead of
   unsigned int, As writel() take an u32 as first argument...

Changes in v3:
 - Replaced the type of hs_mask and fm_mask by unsigned int,
   instead of unsigned long.

 drivers/i2c/busses/Kconfig   |  2 +-
 drivers/i2c/busses/i2c-pxa.c | 25 +++++++++++++++++++++++--
 2 files changed, 24 insertions(+), 3 deletions(-)

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index d252276..2f56a26 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -763,7 +763,7 @@ config I2C_PUV3
 
 config I2C_PXA
 	tristate "Intel PXA2XX I2C adapter"
-	depends on ARCH_PXA || ARCH_MMP || (X86_32 && PCI && OF)
+	depends on ARCH_PXA || ARCH_MMP || ARCH_MVEBU || (X86_32 && PCI && OF)
 	help
 	  If you have devices in the PXA I2C bus, say yes to this option.
 	  This driver can also be built as a module.  If so, the module
diff --git a/drivers/i2c/busses/i2c-pxa.c b/drivers/i2c/busses/i2c-pxa.c
index e28b825..09b4705 100644
--- a/drivers/i2c/busses/i2c-pxa.c
+++ b/drivers/i2c/busses/i2c-pxa.c
@@ -55,6 +55,7 @@ enum pxa_i2c_types {
 	REGS_PXA3XX,
 	REGS_CE4100,
 	REGS_PXA910,
+	REGS_A3700,
 };
 
 /*
@@ -91,6 +92,13 @@ static struct pxa_reg_layout pxa_reg_layout[] = {
 		.ilcr = 0x28,
 		.iwcr = 0x30,
 	},
+	[REGS_A3700] = {
+		.ibmr = 0x00,
+		.idbr = 0x04,
+		.icr =	0x08,
+		.isr =	0x0c,
+		.isar = 0x10,
+	},
 };
 
 static const struct platform_device_id i2c_pxa_id_table[] = {
@@ -98,6 +106,7 @@ static const struct platform_device_id i2c_pxa_id_table[] = {
 	{ "pxa3xx-pwri2c",	REGS_PXA3XX },
 	{ "ce4100-i2c",		REGS_CE4100 },
 	{ "pxa910-i2c",		REGS_PXA910 },
+	{ "armada-3700-i2c",	REGS_A3700  },
 	{ },
 };
 MODULE_DEVICE_TABLE(platform, i2c_pxa_id_table);
@@ -122,7 +131,9 @@ MODULE_DEVICE_TABLE(platform, i2c_pxa_id_table);
 #define ICR_SADIE	(1 << 13)	   /* slave address detected int enable */
 #define ICR_UR		(1 << 14)	   /* unit reset */
 #define ICR_FM		(1 << 15)	   /* fast mode */
+#define ICR_BUSMODE_FM	(1 << 16)	   /* shifted fast mode for armada-3700 */
 #define ICR_HS		(1 << 16)	   /* High Speed mode */
+#define ICR_BUSMODE_HS	(1 << 17)	   /* shifted high speed mode for armada-3700 */
 #define ICR_GPIOEN	(1 << 19)	   /* enable GPIO mode for SCL in HS */
 
 #define ISR_RWM		(1 << 0)	   /* read/write mode */
@@ -193,6 +204,8 @@ struct pxa_i2c {
 	unsigned char		master_code;
 	unsigned long		rate;
 	bool			highmode_enter;
+	u32			fm_mask;
+	u32			hs_mask;
 };
 
 #define _IBMR(i2c)	((i2c)->reg_ibmr)
@@ -503,8 +516,8 @@ static void i2c_pxa_reset(struct pxa_i2c *i2c)
 		writel(i2c->slave_addr, _ISAR(i2c));
 
 	/* set control register values */
-	writel(I2C_ICR_INIT | (i2c->fast_mode ? ICR_FM : 0), _ICR(i2c));
-	writel(readl(_ICR(i2c)) | (i2c->high_mode ? ICR_HS : 0), _ICR(i2c));
+	writel(I2C_ICR_INIT | (i2c->fast_mode ? i2c->fm_mask : 0), _ICR(i2c));
+	writel(readl(_ICR(i2c)) | (i2c->high_mode ? i2c->hs_mask : 0), _ICR(i2c));
 
 #ifdef CONFIG_I2C_PXA_SLAVE
 	dev_info(&i2c->adap.dev, "Enabling slave mode\n");
@@ -1137,6 +1150,7 @@ static const struct of_device_id i2c_pxa_dt_ids[] = {
 	{ .compatible = "mrvl,pxa-i2c", .data = (void *)REGS_PXA2XX },
 	{ .compatible = "mrvl,pwri2c", .data = (void *)REGS_PXA3XX },
 	{ .compatible = "mrvl,mmp-twsi", .data = (void *)REGS_PXA910 },
+	{ .compatible = "marvell,armada-3700-i2c", .data = (void *)REGS_A3700 },
 	{}
 };
 MODULE_DEVICE_TABLE(of, i2c_pxa_dt_ids);
@@ -1158,6 +1172,13 @@ static int i2c_pxa_probe_dt(struct platform_device *pdev, struct pxa_i2c *i2c,
 		i2c->use_pio = 1;
 	if (of_get_property(np, "mrvl,i2c-fast-mode", NULL))
 		i2c->fast_mode = 1;
+	if (of_device_is_compatible(np, "marvell,armada-3700-i2c")) {
+		i2c->fm_mask = ICR_BUSMODE_FM;
+		i2c->hs_mask = ICR_BUSMODE_HS;
+	} else {
+		i2c->fm_mask = ICR_FM;
+		i2c->hs_mask = ICR_HS;
+	}
 
 	*i2c_types = (enum pxa_i2c_types)(of_id->data);
 
-- 
2.9.3

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[PATCH v4 2/3] arm64: dts: marvell: Add I2C definitions for the Armada 3700

[Romain Perier]

The Armada 3700 has two i2c bus interface units, this commit adds the
definitions of the corresponding device nodes. It also enables the node
on the development board for this SoC.

Signed-off-by: Romain Perier <romain.perier@free-electrons.com>
Acked-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
---
 arch/arm64/boot/dts/marvell/armada-3720-db.dts |  4 ++++
 arch/arm64/boot/dts/marvell/armada-37xx.dtsi   | 18 ++++++++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/arch/arm64/boot/dts/marvell/armada-3720-db.dts b/arch/arm64/boot/dts/marvell/armada-3720-db.dts
index 1372e9a6..16d84af 100644
--- a/arch/arm64/boot/dts/marvell/armada-3720-db.dts
+++ b/arch/arm64/boot/dts/marvell/armada-3720-db.dts
@@ -62,6 +62,10 @@
 	};
 };
 
+&i2c0 {
+	status = "okay";
+};
+
 /* CON3 */
 &sata {
 	status = "okay";
diff --git a/arch/arm64/boot/dts/marvell/armada-37xx.dtsi b/arch/arm64/boot/dts/marvell/armada-37xx.dtsi
index c476253..bf2d73d 100644
--- a/arch/arm64/boot/dts/marvell/armada-37xx.dtsi
+++ b/arch/arm64/boot/dts/marvell/armada-37xx.dtsi
@@ -98,6 +98,24 @@
 			/* 32M internal register @ 0xd000_0000 */
 			ranges = <0x0 0x0 0xd0000000 0x2000000>;
 
+			i2c0: i2c@11000 {
+				compatible = "marvell,armada-3700-i2c";
+				reg = <0x11000 0x24>;
+				clocks = <&nb_perih_clk 10>;
+				interrupts = <GIC_SPI 1 IRQ_TYPE_LEVEL_HIGH>;
+				mrvl,i2c-fast-mode;
+				status = "disabled";
+			};
+
+			i2c1: i2c@11080 {
+				compatible = "marvell,armada-3700-i2c";
+				reg = <0x11080 0x24>;
+				clocks = <&nb_perih_clk 9>;
+				interrupts = <GIC_SPI 2 IRQ_TYPE_LEVEL_HIGH>;
+				mrvl,i2c-fast-mode;
+				status = "disabled";
+			};
+
 			uart0: serial@12000 {
 				compatible = "marvell,armada-3700-uart";
 				reg = <0x12000 0x400>;
-- 
2.9.3

[PATCH v4 3/3] dt-bindings: i2c: pxa: Update the documentation for the Armada 3700

[Romain Perier]

This commit documents the compatible string to have the compatibility for
the I2C unit found in the Armada 3700.

Signed-off-by: Romain Perier <romain.perier-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---

Changes in v2:
 - Fixed wrong compatible string, it should be "marvell,armada-3700-i2c"
   and not "marvell,armada-3700".

 Documentation/devicetree/bindings/i2c/i2c-pxa.txt | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/i2c/i2c-pxa.txt b/Documentation/devicetree/bindings/i2c/i2c-pxa.txt
index 12b78ac..d30f0b1 100644
--- a/Documentation/devicetree/bindings/i2c/i2c-pxa.txt
+++ b/Documentation/devicetree/bindings/i2c/i2c-pxa.txt
@@ -7,6 +7,7 @@ Required properties :
    compatible processor, e.g. pxa168, pxa910, mmp2, mmp3.
    For the pxa2xx/pxa3xx, an additional node "mrvl,pxa-i2c" is required
    as shown in the example below.
+   For the Armada 3700, the compatible should be "marvell,armada-3700-i2c".
 
 Recommended properties :
 
-- 
2.9.3

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Re: [PATCH v4 3/3] dt-bindings: i2c: pxa: Update the documentation for the Armada 3700

[Rob Herring]

On Wed, Nov 09, 2016 at 12:57:15PM +0100, Romain Perier wrote:
> This commit documents the compatible string to have the compatibility for
> the I2C unit found in the Armada 3700.
> 
> Signed-off-by: Romain Perier <romain.perier@free-electrons.com>
> ---
> 
> Changes in v2:
>  - Fixed wrong compatible string, it should be "marvell,armada-3700-i2c"
>    and not "marvell,armada-3700".
> 
>  Documentation/devicetree/bindings/i2c/i2c-pxa.txt | 1 +
>  1 file changed, 1 insertion(+)

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

Re: [v4, 1/3] i2c: pxa: Add support for the I2C units found in Armada 3700

[Wolfram Sang]

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> +	[REGS_A3700] = {
> +		.ibmr = 0x00,
> +		.idbr = 0x04,
> +		.icr =	0x08,
> +		.isr =	0x0c,
> +		.isar = 0x10,
> +	},

Can't you reuse REGS_PXA3XX?

>  static const struct platform_device_id i2c_pxa_id_table[] = {
> @@ -98,6 +106,7 @@ static const struct platform_device_id i2c_pxa_id_table[] = {
>  	{ "pxa3xx-pwri2c",	REGS_PXA3XX },
>  	{ "ce4100-i2c",		REGS_CE4100 },
>  	{ "pxa910-i2c",		REGS_PXA910 },
> +	{ "armada-3700-i2c",	REGS_A3700  },

So, you declare a platform_device_id here...

> +	if (of_device_is_compatible(np, "marvell,armada-3700-i2c")) {
> +		i2c->fm_mask = ICR_BUSMODE_FM;
> +		i2c->hs_mask = ICR_BUSMODE_HS;
> +	} else {
> +		i2c->fm_mask = ICR_FM;
> +		i2c->hs_mask = ICR_HS;
> +	}

... but don't consider this case here?


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