[PATCH v4 0/2] dt-bindings: mmc: st,sdhci: convert STMicroelectronics SDHCI-ST MMC/SD Controller controller binding to YAML

[PATCH v4 0/2] dt-bindings: mmc: st,sdhci: convert STMicroelectronics SDHCI-ST MMC/SD Controller controller binding to YAML

[Charan Pedumuru]

This patch series converts the legacy text-based Device Tree binding for
STMicroelectronics SDHCI-ST MMC/SD controller to DT schema (YAML) format.

Note:
The patch "dt-bindings: mmc: st,sdhci: convert to DT schema"
depends on the patch "arm: dts: st: align node patterns with established
convention". If the DT schema patch is applied before the DTS
cleanup patch, `dtbs_check` will fail due to the presence of the removed
properties in the existing DTS.

Signed-off-by: Charan Pedumuru <charan.pedumuru@gmail.com>
---
Changes in v4:
- st,sdhci: Add minItems: 1 to clock-names and reg-names to allow single-entry
  configurations, fixing dtbs_check failures on nodes that omit the
  optional 'icn' clock or 'top-mmc-delay' register region.
- st,sdhci: Modify the commit message to explain the changes.
- Link to v3: https://patch.msgid.link/20260508-st-mmc-v3-0-81c329ed28e8@gmail.com

Changes in v3:
- st,sdhci: Edit description of reg property. Modify reg-names. Add
  "minItems" for clocks and clock-names properties.
- Modify the commit message to match with the updated changes.
- Link to v2: https://patch.msgid.link/20260503-st-mmc-v2-0-11ae3216d2ce@gmail.com

Changes in v2:
- Fix node name in DTS for the MMC to match with the estableshed convention.
- st,sdhci: drop unnecessary properties, modify "reg", "reg-names" and
  "clock-names" properties, include an allOf with $ref to mmc-controller.
- Link to v1: https://patch.msgid.link/20260409-st-mmc-v1-1-4c54321c3535@gmail.com

---
Charan Pedumuru (2):
      arm: dts: st: align node patterns with established convention
      dt-bindings: mmc: st,sdhci: Convert to DT schema

 Documentation/devicetree/bindings/mmc/sdhci-st.txt | 110 ---------------------
 .../devicetree/bindings/mmc/st,sdhci.yaml          |  92 +++++++++++++++++
 arch/arm/boot/dts/st/stih407-family.dtsi           |   4 +-
 3 files changed, 94 insertions(+), 112 deletions(-)
---
base-commit: cf2cd8efd046c561191b8541d32a8bfe845bf06b
change-id: 20260327-st-mmc-c906ad95ff83

Best regards,
--  
Charan Pedumuru <charan.pedumuru@gmail.com>

[PATCH v4 1/2] arm: dts: st: align node patterns with established convention

[Charan Pedumuru]

Update ST MMC DTS node patterns to match established convention.

Signed-off-by: Charan Pedumuru <charan.pedumuru@gmail.com>
---
 arch/arm/boot/dts/st/stih407-family.dtsi | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm/boot/dts/st/stih407-family.dtsi b/arch/arm/boot/dts/st/stih407-family.dtsi
index 3e6a0542e3ae..08acba209c56 100644
--- a/arch/arm/boot/dts/st/stih407-family.dtsi
+++ b/arch/arm/boot/dts/st/stih407-family.dtsi
@@ -596,7 +596,7 @@ spi@9542000 {
 			status = "disabled";
 		};
 
-		mmc0: sdhci@9060000 {
+		mmc0: mmc@9060000 {
 			compatible = "st,sdhci-stih407", "st,sdhci";
 			status = "disabled";
 			reg = <0x09060000 0x7ff>, <0x9061008 0x20>;
@@ -611,7 +611,7 @@ mmc0: sdhci@9060000 {
 			bus-width = <8>;
 		};
 
-		mmc1: sdhci@9080000 {
+		mmc1: mmc@9080000 {
 			compatible = "st,sdhci-stih407", "st,sdhci";
 			status = "disabled";
 			reg = <0x09080000 0x7ff>;

-- 
2.54.0

[PATCH v4 2/2] dt-bindings: mmc: st,sdhci: Convert to DT schema

[Charan Pedumuru]

Convert STMicroelectronics sdhci-st MMC/SD controller binding to
DT schema.

The 'icn' clock and 'top-mmc-delay' register region are optional in
the text binding and remain so in the YAML schema. minItems: 1 is
set on clock-names and reg-names to match the flexibility of their
paired clocks and reg properties, preserving compatibility with
existing in-tree DTS nodes that provide only a single clock or
register entry.

Signed-off-by: Charan Pedumuru <charan.pedumuru@gmail.com>
---
 Documentation/devicetree/bindings/mmc/sdhci-st.txt | 110 ---------------------
 .../devicetree/bindings/mmc/st,sdhci.yaml          |  92 +++++++++++++++++
 2 files changed, 92 insertions(+), 110 deletions(-)

diff --git a/Documentation/devicetree/bindings/mmc/sdhci-st.txt b/Documentation/devicetree/bindings/mmc/sdhci-st.txt
deleted file mode 100644
index ccf82b4ee838..000000000000
--- a/Documentation/devicetree/bindings/mmc/sdhci-st.txt
+++ /dev/null
@@ -1,110 +0,0 @@
-* STMicroelectronics sdhci-st MMC/SD controller
-
-This file documents the differences between the core properties in
-Documentation/devicetree/bindings/mmc/mmc.txt and the properties
-used by the sdhci-st driver.
-
-Required properties:
-- compatible:		Must be "st,sdhci" and it can be compatible to "st,sdhci-stih407"
-			to set the internal glue logic used for configuring the MMC
-			subsystem (mmcss) inside the FlashSS (available in STiH407 SoC
-			family).
-
-- clock-names:		Should be "mmc" and "icn".  (NB: The latter is not compulsory)
-			See: Documentation/devicetree/bindings/resource-names.txt
-- clocks:		Phandle to the clock.
-			See: Documentation/devicetree/bindings/clock/clock-bindings.txt
-
-- interrupts:		One mmc interrupt should be described here.
-- interrupt-names:	Should be "mmcirq".
-
-- pinctrl-names:	A pinctrl state names "default" must be defined.
-- pinctrl-0:		Phandle referencing pin configuration of the sd/emmc controller.
-			See: Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
-
-- reg:			This must provide the host controller base address and it can also
-			contain the FlashSS Top register for TX/RX delay used by the driver
-			to configure DLL inside the flashSS, if so reg-names must also be
-			specified.
-
-Optional properties:
-- reg-names:		Should be "mmc" and "top-mmc-delay". "top-mmc-delay" is optional
-			for eMMC on stih407 family silicon to configure DLL inside FlashSS.
-
-- non-removable:	Non-removable slot. Also used for configuring mmcss in STiH407 SoC
-			family.
-			See:  Documentation/devicetree/bindings/mmc/mmc.txt.
-
-- bus-width:		Number of data lines.
-			See:  Documentation/devicetree/bindings/mmc/mmc.txt.
-
-- max-frequency:	Can be 200MHz, 100MHz or 50MHz (default) and used for
-			configuring the CCONFIG3 in the mmcss.
-			See:  Documentation/devicetree/bindings/mmc/mmc.txt.
-
-- resets:		Phandle and reset specifier pair to softreset line of HC IP.
-			See: Documentation/devicetree/bindings/reset/reset.txt
-
-- vqmmc-supply:		Phandle to the regulator dt node, mentioned as the vcc/vdd
-			supply in eMMC/SD specs.
-
-- sd-uhs-sdr50:	To enable the SDR50 in the mmcss.
-			See:  Documentation/devicetree/bindings/mmc/mmc.txt.
-
-- sd-uhs-sdr104:	To enable the SDR104 in the mmcss.
-			See:  Documentation/devicetree/bindings/mmc/mmc.txt.
-
-- sd-uhs-ddr50:		To enable the DDR50 in the mmcss.
-			See:  Documentation/devicetree/bindings/mmc/mmc.txt.
-
-Example:
-
-/* Example stih416e eMMC configuration */
-
-mmc0: sdhci@fe81e000 {
-	compatible	= "st,sdhci";
-	reg		= <0xfe81e000 0x1000>;
-	interrupts	= <GIC_SPI 127 IRQ_TYPE_NONE>;
-	interrupt-names	= "mmcirq";
-	pinctrl-names	= "default";
-	pinctrl-0	= <&pinctrl_mmc0>;
-	clock-names	= "mmc";
-	clocks		= <&clk_s_a1_ls 1>;
-	bus-width	= <8>
-
-/* Example SD stih407 family configuration */
-
-mmc1: sdhci@9080000 {
-	compatible	= "st,sdhci-stih407", "st,sdhci";
-	reg		= <0x09080000 0x7ff>;
-	reg-names	= "mmc";
-	interrupts	= <GIC_SPI 90 IRQ_TYPE_NONE>;
-	interrupt-names	= "mmcirq";
-	pinctrl-names	= "default";
-	pinctrl-0	= <&pinctrl_sd1>;
-	clock-names	= "mmc";
-	clocks		= <&clk_s_c0_flexgen CLK_MMC_1>;
-	resets		= <&softreset STIH407_MMC1_SOFTRESET>;
-	bus-width	= <4>;
-};
-
-/* Example eMMC stih407 family configuration */
-
-mmc0: sdhci@9060000 {
-	compatible	= "st,sdhci-stih407", "st,sdhci";
-	reg		= <0x09060000 0x7ff>, <0x9061008 0x20>;
-	reg-names	= "mmc", "top-mmc-delay";
-	interrupts	= <GIC_SPI 92 IRQ_TYPE_NONE>;
-	interrupt-names	= "mmcirq";
-	pinctrl-names	= "default";
-	pinctrl-0	= <&pinctrl_mmc0>;
-	clock-names	= "mmc";
-	clocks		= <&clk_s_c0_flexgen CLK_MMC_0>;
-	vqmmc-supply	= <&vmmc_reg>;
-	max-frequency	= <200000000>;
-	bus-width	= <8>;
-	non-removable;
-	sd-uhs-sdr50;
-	sd-uhs-sdr104;
-	sd-uhs-ddr50;
-};
diff --git a/Documentation/devicetree/bindings/mmc/st,sdhci.yaml b/Documentation/devicetree/bindings/mmc/st,sdhci.yaml
new file mode 100644
index 000000000000..0bf4fc3ca699
--- /dev/null
+++ b/Documentation/devicetree/bindings/mmc/st,sdhci.yaml
@@ -0,0 +1,92 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mmc/st,sdhci.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: STMicroelectronics SDHCI-ST MMC/SD Controller
+
+maintainers:
+  - Peter Griffin <peter.griffin@linaro.org>
+
+description:
+  The STMicroelectronics SDHCI-ST MMC/SD host controller is compliant with
+  the SD Host Controller Interface (SDHCI) specification and is used to
+  interface with MMC, SD and SDIO cards. The ST SDHCI controller extends the
+  standard SDHCI capabilities with platform-specific configurations such as
+  additional register regions, clock inputs, and delay control mechanisms
+  required for signal timing adjustments to support high-speed modes across
+  different ST SoCs.
+
+allOf:
+  - $ref: mmc-controller.yaml#
+
+properties:
+  compatible:
+    oneOf:
+      - const: st,sdhci
+      - items:
+          - const: st,sdhci-stih407
+          - const: st,sdhci
+
+  reg:
+    minItems: 1
+    items:
+      - description: MMC controller base registers
+      - description: FlashSS Top registers for TX/RX DLL delay configuration
+
+  reg-names:
+    minItems: 1
+    items:
+      - const: mmc
+      - const: top-mmc-delay
+
+  clocks:
+    minItems: 1
+    items:
+      - description: Clock for the MMC controller
+      - description: Interconnect (ICN) clock
+
+  clock-names:
+    minItems: 1
+    items:
+      - const: mmc
+      - const: icn
+
+  interrupts:
+    maxItems: 1
+
+  interrupt-names:
+    const: mmcirq
+
+  resets:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - interrupts
+  - interrupt-names
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/clock/stih407-clks.h>
+    mmc@9060000 {
+        compatible = "st,sdhci-stih407", "st,sdhci";
+        reg = <0x09060000 0x7ff>, <0x9061008 0x20>;
+        reg-names = "mmc", "top-mmc-delay";
+        interrupts = <GIC_SPI 92 IRQ_TYPE_LEVEL_HIGH>;
+        interrupt-names = "mmcirq";
+        pinctrl-names = "default";
+        pinctrl-0 = <&pinctrl_mmc0>;
+        clock-names = "mmc", "icn";
+        clocks = <&clk_s_c0_flexgen CLK_MMC_0>,
+                 <&clk_s_c0_flexgen CLK_RX_ICN_HVA>;
+        bus-width = <8>;
+    };
+...

-- 
2.54.0

Re: [PATCH v4 1/2] arm: dts: st: align node patterns with established convention

[Krzysztof Kozlowski]

On Sat, Jun 13, 2026 at 09:39:39AM +0000, Charan Pedumuru wrote:
> Update ST MMC DTS node patterns to match established convention.
> 
> Signed-off-by: Charan Pedumuru <charan.pedumuru@gmail.com>
> ---
>  arch/arm/boot/dts/st/stih407-family.dtsi | 4 ++--

Thanks, but please fix all the files of stih in one commit, not file by
file. git grep gives more instances of it.

>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm/boot/dts/st/stih407-family.dtsi b/arch/arm/boot/dts/st/stih407-family.dtsi
> index 3e6a0542e3ae..08acba209c56 100644
> --- a/arch/arm/boot/dts/st/stih407-family.dtsi

Best regards,
Krzysztof

Re: [PATCH v4 1/2] arm: dts: st: align node patterns with established convention

[Krzysztof Kozlowski]

On 13/06/2026 20:23, Krzysztof Kozlowski wrote:
> On Sat, Jun 13, 2026 at 09:39:39AM +0000, Charan Pedumuru wrote:
>> Update ST MMC DTS node patterns to match established convention.
>>
>> Signed-off-by: Charan Pedumuru <charan.pedumuru@gmail.com>
>> ---
>>  arch/arm/boot/dts/st/stih407-family.dtsi | 4 ++--
> 
> Thanks, but please fix all the files of stih in one commit, not file by
> file. git grep gives more instances of it.
> 

Heh, no it isn't only that. You actually broke other users! And you
received that comment already at v3 which you completely ignored.

This looks like introducing real bugs.

Best regards,
Krzysztof