[PATCH v4 0/4] Add sdmmc UHS support to ROC-RK3328-CC board.

[PATCH v4 0/4] Add sdmmc UHS support to ROC-RK3328-CC board.

[djw]

From: Levin Du <djw@t-chip.com.cn>


Hi all, this is an attemp to add sdmmc UHS support to the
ROC-RK3328-CC board.

This patch series adds a new compatible `rockchip,rk3328-grf-gpio` to
the gpio-syscon driver, which currently only support for the access of
the GPIO_MUTE pin in RK3328. Support for HDMI pins can be added later on
perhaps by writing a standalone driver.

A new GRF GPIO controller named `grf_gpio` is defined in rk3328.dtsi so
that all RK3328 boards has access to it.

The ROC-RK3328-CC board use the new gpio <&grf_gpio 0> in gpio-regulator
to control the signal voltage of the sdmmc. It is essential for UHS
support which requires 1.8V signal voltage.

Many thanks to the Linux people!

Changes in v4:
- Use binding of "rockchip,rk3328-grf-gpio"
- Use <&grf_gpio 0> to refer to the GPIO_MUTE pin.

Changes in v3:
- Change from general gpio-syscon to specific rk3328-gpio-mute
- Use dedicated "rockchip,rk3328-gpio-mute" driver
- Use <&gpio_mute 0> instead of <&gpio_mute 1> to refer to the GPIO_MUTE pin.

Changes in v2:
- Rename gpio_syscon10 to gpio_mute in doc
- Rename gpio_syscon10 to gpio_mute in rk3328.dtsi
- Rename gpio_syscon10 to gpio_mute in rk3328-roc-cc.dts

Changes in v1:
- Refactured for general gpio-syscon usage for Rockchip SoCs.
- Add doc rockchip,gpio-syscon.txt
- Split from V0 and add to rk3328.dtsi for general use.
- Split from V0.
- Split into small patches
- Sort dts properties in sdmmc node

Levin Du (4):
  gpio: syscon: rockchip: add GRF GPIO support for rk3328
  arm64: dts: rockchip: add GRF GPIO controller to rk3328
  arm64: dts: rockchip: add io-domain to roc-rk3328-cc
  arm64: dts: rockchip: add sdmmc UHS support for roc-rk3328-cc

 .../bindings/gpio/rockchip,rk3328-grf-gpio.txt     | 32 ++++++++++++++++++++
 arch/arm64/boot/dts/rockchip/rk3328-roc-cc.dts     | 34 ++++++++++++++++++++++
 arch/arm64/boot/dts/rockchip/rk3328.dtsi           |  6 ++++
 drivers/gpio/gpio-syscon.c                         | 31 ++++++++++++++++++++
 4 files changed, 103 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/rockchip,rk3328-grf-gpio.txt

-- 
2.7.4

[PATCH v4 1/4] gpio: syscon: rockchip: add GRF GPIO support for rk3328

[djw]

From: Levin Du <djw@t-chip.com.cn>

In Rockchip RK3328, the output only GPIO_MUTE pin, originally for codec
mute control, can also be used for general purpose. It is manipulated by
the GRF_SOC_CON10 register in GRF. Aside from the GPIO_MUTE pin, the HDMI
pins can also be set in the same way.

Currently this GRF GPIO controller only supports the mute pin. If needed
in the future, the HDMI pins support can also be added.

Signed-off-by: Levin Du <djw@t-chip.com.cn>

---

Changes in v4:
- Rename the GPIO binding to "rockchip,rk3328-grf-gpio"

Changes in v3:
- Change from general gpio-syscon to specific rk3328-gpio-mute

Changes in v2:
- Rename gpio_syscon10 to gpio_mute in doc

Changes in v1:
- Refactured for general gpio-syscon usage for Rockchip SoCs.
- Add doc rockchip,gpio-syscon.txt

 .../bindings/gpio/rockchip,rk3328-grf-gpio.txt     | 32 ++++++++++++++++++++++
 drivers/gpio/gpio-syscon.c                         | 31 +++++++++++++++++++++
 2 files changed, 63 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/rockchip,rk3328-grf-gpio.txt

diff --git a/Documentation/devicetree/bindings/gpio/rockchip,rk3328-grf-gpio.txt b/Documentation/devicetree/bindings/gpio/rockchip,rk3328-grf-gpio.txt
new file mode 100644
index 0000000..f9231df
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/rockchip,rk3328-grf-gpio.txt
@@ -0,0 +1,32 @@
+Rockchip RK3328 GRF (General Register Files) GPIO controller.
+
+In Rockchip RK3328, the output only GPIO_MUTE pin, originally for codec mute
+control, can also be used for general purpose. It is manipulated by the
+GRF_SOC_CON10 register in GRF. Aside from the GPIO_MUTE pin, the HDMI pins can
+also be set in the same way.
+
+Currently this GPIO controller only supports the mute pin. If needed in the
+future, the HDMI pins support can also be added.
+
+Required properties:
+- compatible: Should contain "rockchip,rk3328-grf-gpio".
+- gpio-controller: Marks the device node as a gpio controller.
+- #gpio-cells: Should be 2. The first cell is the pin number and
+  the second cell is used to specify the gpio polarity:
+    0 = Active high,
+    1 = Active low.
+
+Example:
+
+	grf: syscon@ff100000 {
+		compatible = "rockchip,rk3328-grf", "syscon", "simple-mfd";
+
+		grf_gpio: grf-gpio {
+			compatible = "rockchip,rk3328-grf-gpio";
+			gpio-controller;
+			#gpio-cells = <2>;
+		};
+	};
+
+Note: The grf_gpio node should be declared as the child of the GRF (General
+Register File) node. The GPIO_MUTE pin is referred to as <&grf_gpio 0>.
diff --git a/drivers/gpio/gpio-syscon.c b/drivers/gpio/gpio-syscon.c
index 8b0a69c..b9b5842 100644
--- a/drivers/gpio/gpio-syscon.c
+++ b/drivers/gpio/gpio-syscon.c
@@ -135,6 +135,33 @@ static const struct syscon_gpio_data clps711x_mctrl_gpio = {
 	.dat_bit_offset	= 0x40 * 8 + 8,
 };
 
+static void rockchip_gpio_set(struct gpio_chip *chip, unsigned int offset,
+			      int val)
+{
+	struct syscon_gpio_priv *priv = gpiochip_get_data(chip);
+	unsigned int offs;
+	u8 bit;
+	u32 data;
+	int ret;
+
+	offs = priv->dreg_offset + priv->data->dat_bit_offset + offset;
+	bit = offs % SYSCON_REG_BITS;
+	data = (val ? BIT(bit) : 0) | BIT(bit + 16);
+	ret = regmap_write(priv->syscon,
+			   (offs / SYSCON_REG_BITS) * SYSCON_REG_SIZE,
+			   data);
+	if (ret < 0)
+		dev_err(chip->parent, "gpio write failed ret(%d)\n", ret);
+}
+
+static const struct syscon_gpio_data rockchip_rk3328_gpio_mute = {
+	/* RK3328 GPIO_MUTE is an output only pin at GRF_SOC_CON10[1] */
+	.flags		= GPIO_SYSCON_FEAT_OUT,
+	.bit_count	= 1,
+	.dat_bit_offset = 0x0428 * 8 + 1,
+	.set		= rockchip_gpio_set,
+};
+
 #define KEYSTONE_LOCK_BIT BIT(0)
 
 static void keystone_gpio_set(struct gpio_chip *chip, unsigned offset, int val)
@@ -175,6 +202,10 @@ static const struct of_device_id syscon_gpio_ids[] = {
 		.compatible	= "ti,keystone-dsp-gpio",
 		.data		= &keystone_dsp_gpio,
 	},
+	{
+		.compatible	= "rockchip,rk3328-grf-gpio",
+		.data		= &rockchip_rk3328_gpio_mute,
+	},
 	{ }
 };
 MODULE_DEVICE_TABLE(of, syscon_gpio_ids);
-- 
2.7.4

Re: [PATCH v4 1/4] gpio: syscon: rockchip: add GRF GPIO support for rk3328

[Rob Herring]

On Tue, Jul 31, 2018 at 01:59:19PM +0800, djw@t-chip.com.cn wrote:
> From: Levin Du <djw@t-chip.com.cn>
> 
> In Rockchip RK3328, the output only GPIO_MUTE pin, originally for codec
> mute control, can also be used for general purpose. It is manipulated by
> the GRF_SOC_CON10 register in GRF. Aside from the GPIO_MUTE pin, the HDMI
> pins can also be set in the same way.
> 
> Currently this GRF GPIO controller only supports the mute pin. If needed
> in the future, the HDMI pins support can also be added.
> 
> Signed-off-by: Levin Du <djw@t-chip.com.cn>
> 
> ---
> 
> Changes in v4:
> - Rename the GPIO binding to "rockchip,rk3328-grf-gpio"
> 
> Changes in v3:
> - Change from general gpio-syscon to specific rk3328-gpio-mute
> 
> Changes in v2:
> - Rename gpio_syscon10 to gpio_mute in doc
> 
> Changes in v1:
> - Refactured for general gpio-syscon usage for Rockchip SoCs.
> - Add doc rockchip,gpio-syscon.txt
> 
>  .../bindings/gpio/rockchip,rk3328-grf-gpio.txt     | 32 ++++++++++++++++++++++
>  drivers/gpio/gpio-syscon.c                         | 31 +++++++++++++++++++++
>  2 files changed, 63 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/gpio/rockchip,rk3328-grf-gpio.txt

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

Re: [PATCH v4 1/4] gpio: syscon: rockchip: add GRF GPIO support for rk3328

[Heiko Stuebner]

Am Dienstag, 31. Juli 2018, 07:59:19 CEST schrieb djw@t-chip.com.cn:
> From: Levin Du <djw@t-chip.com.cn>
> 
> In Rockchip RK3328, the output only GPIO_MUTE pin, originally for codec
> mute control, can also be used for general purpose. It is manipulated by
> the GRF_SOC_CON10 register in GRF. Aside from the GPIO_MUTE pin, the HDMI
> pins can also be set in the same way.
> 
> Currently this GRF GPIO controller only supports the mute pin. If needed
> in the future, the HDMI pins support can also be added.
> 
> Signed-off-by: Levin Du <djw@t-chip.com.cn>

Reviewed-by: Heiko Stuebner <heiko@sntech.de>

It looks like Linus (Torvalds) is doing an -rc8 this time [0] so we might
still be in time for 4.19 , depending on when this patch is going to be
applied ;-) .


Heiko


[0] https://lore.kernel.org/lkml/CA+55aFzHRaNMHxLCEa5Zke-1FgbQ4rtHf8-HOu0zBzo4Liz88A@mail.gmail.com/

Re: [PATCH v4 1/4] gpio: syscon: rockchip: add GRF GPIO support for rk3328

[Linus Walleij]

On Tue, Jul 31, 2018 at 8:00 AM <djw@t-chip.com.cn> wrote:

> From: Levin Du <djw@t-chip.com.cn>
>
> In Rockchip RK3328, the output only GPIO_MUTE pin, originally for codec
> mute control, can also be used for general purpose. It is manipulated by
> the GRF_SOC_CON10 register in GRF. Aside from the GPIO_MUTE pin, the HDMI
> pins can also be set in the same way.
>
> Currently this GRF GPIO controller only supports the mute pin. If needed
> in the future, the HDMI pins support can also be added.
>
> Signed-off-by: Levin Du <djw@t-chip.com.cn>

Patch applied with Rob's and Heiko's ACKs.

Yours,
Linus Walleij