[PATCH V6 01/15] ARM: dts: imx6q-dhcom: Add the parallel system bus

Christoph Niedermaier
2021-07-14T23:46:38Z

Add the parallel system bus provided by the i.MX6 WEIM interface via an
address latch. The OE pin of the latch is controlled by a fixed regulator.
The pin is low active. This is ensured by omitting the regulators property
enable-active-high. The flags value of the gpio property (3rd value), which
is also use to define active high/low, is set to 0 because it is ignored
by gpiolib-of.c.

Signed-off-by: Christoph Niedermaier <cniedermaier@dh-electronics.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Cc: Shawn Guo <shawnguo@kernel.org>
Cc: Fabio Estevam <festevam@denx.de>
Cc: Marek Vasut <marex@denx.de>
Cc: NXP Linux Team <linux-imx@nxp.com>
Cc: kernel@dh-electronics.com
To: linux-arm-kernel@lists.infradead.org
---
V2: - Rework of the commit message
- Add a comment to the regulator
- Replace GPIO_ACTIVE_HIGH with 0 at the gpio property of the regulator
- Remove spaces from the ranges property of the weim node
- Rebase on Shawn Guos branch for-next
V3: - Add Reviewed-by tag
V4: - No changes
V5: - No changes
V6: - Rebase on 5.14-rc1
---
arch/arm/boot/dts/imx6q-dhcom-som.dtsi | 57 ++++++++++++++++++++++++++++++++++
1 file changed, 57 insertions(+)

diff --git a/arch/arm/boot/dts/imx6q-dhcom-som.dtsi b/arch/arm/boot/dts/imx6q-dhcom-som.dtsi
index 4bf51f3ce003..921a695b79fb 100644
--- a/arch/arm/boot/dts/imx6q-dhcom-som.dtsi
+++ b/arch/arm/boot/dts/imx6q-dhcom-som.dtsi
@@ -46,6 +46,14 @@
vin-supply = <&sw2_reg>;
};

+ /* OE pin of the latch is low active */
+ reg_latch_oe_on: regulator-latch-oe-on {
+ compatible = "regulator-fixed";
+ gpio = <&gpio3 22 0>;
+ regulator-always-on;
+ regulator-name = "latch_oe_on";
+ };
+
reg_usb_otg_vbus: regulator-usb-otg-vbus {
compatible = "regulator-fixed";
regulator-name = "usb_otg_vbus";
@@ -455,6 +463,43 @@
MX6QDL_PAD_SD4_DAT7__SD4_DATA7 0x17059
>;
};
+
+ pinctrl_weim: weim-grp {
+ fsl,pins = <
+ MX6QDL_PAD_EIM_OE__EIM_OE_B 0xb0a6
+ MX6QDL_PAD_EIM_RW__EIM_RW 0xb0a6 /* WE */
+ MX6QDL_PAD_EIM_LBA__EIM_LBA_B 0xb060 /* LE */
+ MX6QDL_PAD_EIM_D22__GPIO3_IO22 0x130b0
+ MX6QDL_PAD_EIM_DA15__EIM_AD15 0xb0a6
+ MX6QDL_PAD_EIM_DA14__EIM_AD14 0xb0a6
+ MX6QDL_PAD_EIM_DA13__EIM_AD13 0xb0a6
+ MX6QDL_PAD_EIM_DA12__EIM_AD12 0xb0a6
+ MX6QDL_PAD_EIM_DA11__EIM_AD11 0xb0a6
+ MX6QDL_PAD_EIM_DA10__EIM_AD10 0xb0a6
+ MX6QDL_PAD_EIM_DA9__EIM_AD09 0xb0a6
+ MX6QDL_PAD_EIM_DA8__EIM_AD08 0xb0a6
+ MX6QDL_PAD_EIM_DA7__EIM_AD07 0xb0a6
+ MX6QDL_PAD_EIM_DA6__EIM_AD06 0xb0a6
+ MX6QDL_PAD_EIM_DA5__EIM_AD05 0xb0a6
+ MX6QDL_PAD_EIM_DA4__EIM_AD04 0xb0a6
+ MX6QDL_PAD_EIM_DA3__EIM_AD03 0xb0a6
+ MX6QDL_PAD_EIM_DA2__EIM_AD02 0xb0a6
+ MX6QDL_PAD_EIM_DA1__EIM_AD01 0xb0a6
+ MX6QDL_PAD_EIM_DA0__EIM_AD00 0xb0a6
+ >;
+ };
+
+ pinctrl_weim_cs0: weim-cs0-grp {
+ fsl,pins = <
+ MX6QDL_PAD_EIM_CS0__EIM_CS0_B 0xb0b1
+ >;
+ };
+
+ pinctrl_weim_cs1: weim-cs1-grp {
+ fsl,pins = <
+ MX6QDL_PAD_EIM_CS1__EIM_CS1_B 0xb0b1
+ >;
+ };
};

&reg_arm {
@@ -544,3 +589,15 @@
keep-power-in-suspend;
status = "okay";
};
+
+&weim {
+ #address-cells = <2>;
+ #size-cells = <1>;
+ fsl,weim-cs-gpr = <&gpr>;
+ pinctrl-names = "default";
+ pinctrl-0 = <&pinctrl_weim &pinctrl_weim_cs0 &pinctrl_weim_cs1>;
+ /* It is necessary to setup 2x 64MB otherwise setting gpr fails */
+ ranges = <0 0 0x08000000 0x04000000>, /* CS0 */
+ <1 0 0x0c000000 0x04000000>; /* CS1 */
+ status = "disabled";
+};