[PATCH v4 0/6] spmi: apple: Additional commands and interrupt support.

[PATCH v4 0/6] spmi: apple: Additional commands and interrupt support.

[Sasha Finkelstein]

The SPMI bus has grown additional responsibilities in the M3
generation, making the current driver insufficient. Add M3 comatibles,
support for slave-sent interrupts, FIFO interrupts, power management
commands, parity validation, and fix locking.

To simplify the merge strategy, the device tree entries will be sent
in a future patch series.

Signed-off-by: Sasha Finkelstein <k@chaosmail.tech>
---
Changes in v4:
- Re-do error recovery.
- Fix an address calculation mistake
- Link to v3: https://patch.msgid.link/20260803-t603x-spmi-v3-0-c17b506d91a1@chaosmail.tech

Changes in v3:
- Rework interrupt support
- Address review comments
- Link to v2: https://patch.msgid.link/20260728-t603x-spmi-v2-0-f43e5f10e583@chaosmail.tech

Changes in v2:
- Change locking to non-interruptible
- Reorder irq ack
- Clarify dt binding
- Some data type cleanups
- Link to v1: https://patch.msgid.link/20260725-t603x-spmi-v1-0-e1a29fcd2d38@chaosmail.tech

---
Alba Mendez (5):
      spmi: apple: Validate FIFO state
      spmi: apple: check transaction status
      spmi: apple: Implement remaining commands
      spmi: apple: lock around FIFOs
      spmi: apple: Add interrupt functionality

Sasha Finkelstein (1):
      dt-bindings: spmi: apple,spmi: Add t603x

 Documentation/devicetree/bindings/spmi/apple,spmi.yaml |  15 +++++
 drivers/spmi/Kconfig                                   |   3 +-
 drivers/spmi/spmi-apple-controller.c                   | 384 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++----------
 3 files changed, 371 insertions(+), 31 deletions(-)
---
base-commit: 0ce37745d4bfbc493f718169c3974898ffec8ee7
change-id: 20260725-t603x-spmi-74630bf1b0a0

Best regards,
--  
Sasha Finkelstein <k@chaosmail.tech>

[PATCH v4 1/6] dt-bindings: spmi: apple,spmi: Add t603x

[Sasha Finkelstein]

Add t603x compatibles, interrupt support, and support for SPMI
controllers that are not always-on.

Keeping the "interrupt-controller" property as optional, as taking the
j514c as an example, we only need this functionality on 3 out of 10
SPMI controllers present on this SoC.

Signed-off-by: Sasha Finkelstein <k@chaosmail.tech>
---
 Documentation/devicetree/bindings/spmi/apple,spmi.yaml | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/Documentation/devicetree/bindings/spmi/apple,spmi.yaml b/Documentation/devicetree/bindings/spmi/apple,spmi.yaml
index 3e5b14bc8c31..fceed47b2cd1 100644
--- a/Documentation/devicetree/bindings/spmi/apple,spmi.yaml
+++ b/Documentation/devicetree/bindings/spmi/apple,spmi.yaml
@@ -20,8 +20,11 @@ properties:
       - items:
           - enum:
               - apple,t6020-spmi
+              - apple,t6030-spmi
+              - apple,t6031-spmi
               - apple,t8012-spmi
               - apple,t8015-spmi
+              - apple,t8122-spmi
           - const: apple,t8103-spmi
       - items:
           - enum:
@@ -34,6 +37,18 @@ properties:
   reg:
     maxItems: 1
 
+  interrupts:
+    maxItems: 1
+    description: Optional, operates in polled mode if not present
+
+  interrupt-controller: true
+
+  "#interrupt-cells":
+    const: 2
+
+  power-domains:
+    maxItems: 1
+
 required:
   - compatible
   - reg

-- 
2.55.0

Re: [PATCH v4 1/6] dt-bindings: spmi: apple,spmi: Add t603x

[Janne Grunau]

On Wed, Aug 05, 2026 at 12:11:11PM +0200, Sasha Finkelstein wrote:
> Add t603x compatibles, interrupt support, and support for SPMI
> controllers that are not always-on.
> 
> Keeping the "interrupt-controller" property as optional, as taking the
> j514c as an example, we only need this functionality on 3 out of 10
> SPMI controllers present on this SoC.
> 
> Signed-off-by: Sasha Finkelstein <k@chaosmail.tech>
> ---
>  Documentation/devicetree/bindings/spmi/apple,spmi.yaml | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/spmi/apple,spmi.yaml b/Documentation/devicetree/bindings/spmi/apple,spmi.yaml
> index 3e5b14bc8c31..fceed47b2cd1 100644
> --- a/Documentation/devicetree/bindings/spmi/apple,spmi.yaml
> +++ b/Documentation/devicetree/bindings/spmi/apple,spmi.yaml
> @@ -20,8 +20,11 @@ properties:
>        - items:
>            - enum:
>                - apple,t6020-spmi
> +              - apple,t6030-spmi
> +              - apple,t6031-spmi
>                - apple,t8012-spmi
>                - apple,t8015-spmi
> +              - apple,t8122-spmi
>            - const: apple,t8103-spmi
>        - items:
>            - enum:
> @@ -34,6 +37,18 @@ properties:
>    reg:
>      maxItems: 1
>  
> +  interrupts:
> +    maxItems: 1
> +    description: Optional, operates in polled mode if not present
> +
> +  interrupt-controller: true
> +
> +  "#interrupt-cells":
> +    const: 2
> +
> +  power-domains:
> +    maxItems: 1
> +
>  required:
>    - compatible
>    - reg

Reviewed-by: Janne Grunau <j@jannau.net>

Janne

[PATCH v4 2/6] spmi: apple: Validate FIFO state

[Sasha Finkelstein]

From: Alba Mendez <me@alba.sh>

Check for data before reading the body of a reply, and check for
end of data afterwards.

Signed-off-by: Alba Mendez <me@alba.sh>
Signed-off-by: Sasha Finkelstein <k@chaosmail.tech>
---
 drivers/spmi/spmi-apple-controller.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/drivers/spmi/spmi-apple-controller.c b/drivers/spmi/spmi-apple-controller.c
index 376cf682c43e..4d5356bf9bbf 100644
--- a/drivers/spmi/spmi-apple-controller.c
+++ b/drivers/spmi/spmi-apple-controller.c
@@ -21,7 +21,9 @@
 #define SPMI_STATUS_REG 0
 #define SPMI_CMD_REG 0x4
 #define SPMI_RSP_REG 0x8
+#define SPMI_ACT_REG 0xa4
 
+#define SPMI_ACT_FIFO_FLUSH BIT(0)
 #define SPMI_RX_FIFO_EMPTY BIT(24)
 
 #define REG_POLL_INTERVAL_US 10000
@@ -29,6 +31,7 @@
 
 struct apple_spmi {
 	void __iomem *regs;
+	bool prev_fail;
 };
 
 #define poll_reg(spmi, reg, val, cond) \
@@ -49,6 +52,7 @@ static int apple_spmi_wait_rx_not_empty(struct spmi_controller *ctrl)
 
 	ret = poll_reg(spmi, SPMI_STATUS_REG, status, !(status & SPMI_RX_FIFO_EMPTY));
 	if (ret) {
+		spmi->prev_fail = true;
 		dev_err(&ctrl->dev,
 			"failed to wait for RX FIFO not empty\n");
 		return ret;
@@ -67,6 +71,11 @@ static int spmi_read_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
 	u8 i;
 	int ret;
 
+	if (spmi->prev_fail) {
+		writel(SPMI_ACT_FIFO_FLUSH, spmi->regs + SPMI_RSP_REG);
+		spmi->prev_fail = false;
+	}
+
 	writel(spmi_cmd, spmi->regs + SPMI_CMD_REG);
 
 	ret = apple_spmi_wait_rx_not_empty(ctrl);
@@ -78,6 +87,11 @@ static int spmi_read_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
 
 	/* Read SPMI data reply */
 	while (len_read < len) {
+		if (readl(spmi->regs + SPMI_STATUS_REG) & SPMI_RX_FIFO_EMPTY) {
+			dev_err_ratelimited(&ctrl->dev,
+					    "FIFO lacks reply data, controller stuck?\n");
+			return -EIO;
+		}
 		rsp = readl(spmi->regs + SPMI_RSP_REG);
 		i = 0;
 		while ((len_read < len) && (i < 4)) {
@@ -86,6 +100,11 @@ static int spmi_read_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
 		}
 	}
 
+	if (!(readl(spmi->regs + SPMI_STATUS_REG) & SPMI_RX_FIFO_EMPTY)) {
+		dev_warn(&ctrl->dev, "FIFO has extra data\n");
+		spmi->prev_fail = true;
+	}
+
 	return 0;
 }
 
@@ -97,6 +116,11 @@ static int spmi_write_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
 	size_t i = 0, j;
 	int ret;
 
+	if (spmi->prev_fail) {
+		writel(SPMI_ACT_FIFO_FLUSH, spmi->regs + SPMI_RSP_REG);
+		spmi->prev_fail = false;
+	}
+
 	writel(spmi_cmd, spmi->regs + SPMI_CMD_REG);
 
 	while (i < len) {
@@ -115,6 +139,11 @@ static int spmi_write_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
 	/* Discard */
 	readl(spmi->regs + SPMI_RSP_REG);
 
+	if (!(readl(spmi->regs + SPMI_STATUS_REG) & SPMI_RX_FIFO_EMPTY)) {
+		dev_warn(&ctrl->dev, "FIFO has extra data\n");
+		spmi->prev_fail = true;
+	}
+
 	return 0;
 }
 

-- 
2.55.0

Re: [PATCH v4 2/6] spmi: apple: Validate FIFO state

[Janne Grunau]

On Wed, Aug 05, 2026 at 12:11:12PM +0200, Sasha Finkelstein wrote:
> From: Alba Mendez <me@alba.sh>
> 
> Check for data before reading the body of a reply, and check for
> end of data afterwards.
> 
> Signed-off-by: Alba Mendez <me@alba.sh>
> Signed-off-by: Sasha Finkelstein <k@chaosmail.tech>
> ---
>  drivers/spmi/spmi-apple-controller.c | 29 +++++++++++++++++++++++++++++
>  1 file changed, 29 insertions(+)
> 
> diff --git a/drivers/spmi/spmi-apple-controller.c b/drivers/spmi/spmi-apple-controller.c
> index 376cf682c43e..4d5356bf9bbf 100644
> --- a/drivers/spmi/spmi-apple-controller.c
> +++ b/drivers/spmi/spmi-apple-controller.c
> @@ -21,7 +21,9 @@
>  #define SPMI_STATUS_REG 0
>  #define SPMI_CMD_REG 0x4
>  #define SPMI_RSP_REG 0x8
> +#define SPMI_ACT_REG 0xa4
>  
> +#define SPMI_ACT_FIFO_FLUSH BIT(0)
>  #define SPMI_RX_FIFO_EMPTY BIT(24)
>  
>  #define REG_POLL_INTERVAL_US 10000
> @@ -29,6 +31,7 @@
>  
>  struct apple_spmi {
>  	void __iomem *regs;
> +	bool prev_fail;
>  };
>  
>  #define poll_reg(spmi, reg, val, cond) \
> @@ -49,6 +52,7 @@ static int apple_spmi_wait_rx_not_empty(struct spmi_controller *ctrl)
>  
>  	ret = poll_reg(spmi, SPMI_STATUS_REG, status, !(status & SPMI_RX_FIFO_EMPTY));
>  	if (ret) {
> +		spmi->prev_fail = true;
>  		dev_err(&ctrl->dev,
>  			"failed to wait for RX FIFO not empty\n");
>  		return ret;
> @@ -67,6 +71,11 @@ static int spmi_read_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
>  	u8 i;
>  	int ret;
>  
> +	if (spmi->prev_fail) {
> +		writel(SPMI_ACT_FIFO_FLUSH, spmi->regs + SPMI_RSP_REG);
> +		spmi->prev_fail = false;
> +	}
> +
>  	writel(spmi_cmd, spmi->regs + SPMI_CMD_REG);
>  
>  	ret = apple_spmi_wait_rx_not_empty(ctrl);
> @@ -78,6 +87,11 @@ static int spmi_read_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
>  
>  	/* Read SPMI data reply */
>  	while (len_read < len) {
> +		if (readl(spmi->regs + SPMI_STATUS_REG) & SPMI_RX_FIFO_EMPTY) {
> +			dev_err_ratelimited(&ctrl->dev,
> +					    "FIFO lacks reply data, controller stuck?\n");
> +			return -EIO;
> +		}
>  		rsp = readl(spmi->regs + SPMI_RSP_REG);
>  		i = 0;
>  		while ((len_read < len) && (i < 4)) {
> @@ -86,6 +100,11 @@ static int spmi_read_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
>  		}
>  	}
>  
> +	if (!(readl(spmi->regs + SPMI_STATUS_REG) & SPMI_RX_FIFO_EMPTY)) {
> +		dev_warn(&ctrl->dev, "FIFO has extra data\n");
> +		spmi->prev_fail = true;
> +	}
> +
>  	return 0;
>  }
>  
> @@ -97,6 +116,11 @@ static int spmi_write_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
>  	size_t i = 0, j;
>  	int ret;
>  
> +	if (spmi->prev_fail) {
> +		writel(SPMI_ACT_FIFO_FLUSH, spmi->regs + SPMI_RSP_REG);
> +		spmi->prev_fail = false;
> +	}
> +
>  	writel(spmi_cmd, spmi->regs + SPMI_CMD_REG);
>  
>  	while (i < len) {
> @@ -115,6 +139,11 @@ static int spmi_write_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
>  	/* Discard */
>  	readl(spmi->regs + SPMI_RSP_REG);
>  
> +	if (!(readl(spmi->regs + SPMI_STATUS_REG) & SPMI_RX_FIFO_EMPTY)) {
> +		dev_warn(&ctrl->dev, "FIFO has extra data\n");
> +		spmi->prev_fail = true;
> +	}
> +
>  	return 0;
>  }

Reviewed-by: Janne Grunau <j@jannau.net>

Janne

[PATCH v4 3/6] spmi: apple: check transaction status

[Sasha Finkelstein]

From: Alba Mendez <me@alba.sh>

Check for parity errors and missing command ACKs

Signed-off-by: Alba Mendez <me@alba.sh>
Signed-off-by: Sasha Finkelstein <k@chaosmail.tech>
---
 drivers/spmi/spmi-apple-controller.c | 26 +++++++++++++++++++++-----
 1 file changed, 21 insertions(+), 5 deletions(-)

diff --git a/drivers/spmi/spmi-apple-controller.c b/drivers/spmi/spmi-apple-controller.c
index 4d5356bf9bbf..7ebf899edf17 100644
--- a/drivers/spmi/spmi-apple-controller.c
+++ b/drivers/spmi/spmi-apple-controller.c
@@ -11,6 +11,8 @@
  *		spmi-pmic-arb.c Copyright (c) 2021, The Linux Foundation.
  */
 
+#include <linux/bitfield.h>
+#include <linux/bits.h>
 #include <linux/io.h>
 #include <linux/iopoll.h>
 #include <linux/module.h>
@@ -23,6 +25,12 @@
 #define SPMI_RSP_REG 0x8
 #define SPMI_ACT_REG 0xa4
 
+/* SPMI_RSP_REG reply word */
+#define SPMI_REPLY_FRAME_PARITY_STATUS GENMASK(31, 16)
+#define SPMI_REPLY_ACK BIT(15)
+#define SPMI_REPLY_SLAVE_ID GENMASK(14, 8)
+#define SPMI_REPLY_CMD GENMASK(7, 0)
+
 #define SPMI_ACT_FIFO_FLUSH BIT(0)
 #define SPMI_RX_FIFO_EMPTY BIT(24)
 
@@ -66,7 +74,7 @@ static int spmi_read_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
 {
 	struct apple_spmi *spmi = spmi_controller_get_drvdata(ctrl);
 	u32 spmi_cmd = apple_spmi_pack_cmd(opc, sid, saddr, len);
-	u32 rsp;
+	u32 reply, rsp;
 	size_t len_read = 0;
 	u8 i;
 	int ret;
@@ -82,12 +90,12 @@ static int spmi_read_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
 	if (ret)
 		return ret;
 
-	/* Discard SPMI reply status */
-	readl(spmi->regs + SPMI_RSP_REG);
+	reply = readl(spmi->regs + SPMI_RSP_REG);
 
 	/* Read SPMI data reply */
 	while (len_read < len) {
 		if (readl(spmi->regs + SPMI_STATUS_REG) & SPMI_RX_FIFO_EMPTY) {
+			spmi->prev_fail = true;
 			dev_err_ratelimited(&ctrl->dev,
 					    "FIFO lacks reply data, controller stuck?\n");
 			return -EIO;
@@ -105,6 +113,10 @@ static int spmi_read_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
 		spmi->prev_fail = true;
 	}
 
+	if (~FIELD_GET(SPMI_REPLY_FRAME_PARITY_STATUS, reply) & ((1 << len) - 1)) {
+		dev_err(&ctrl->dev, "some frames failed parity check\n");
+		return -EIO;
+	}
 	return 0;
 }
 
@@ -113,6 +125,7 @@ static int spmi_write_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
 {
 	struct apple_spmi *spmi = spmi_controller_get_drvdata(ctrl);
 	u32 spmi_cmd = apple_spmi_pack_cmd(opc, sid, saddr, len);
+	u32 reply;
 	size_t i = 0, j;
 	int ret;
 
@@ -136,14 +149,17 @@ static int spmi_write_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
 	if (ret)
 		return ret;
 
-	/* Discard */
-	readl(spmi->regs + SPMI_RSP_REG);
+	reply = readl(spmi->regs + SPMI_RSP_REG);
 
 	if (!(readl(spmi->regs + SPMI_STATUS_REG) & SPMI_RX_FIFO_EMPTY)) {
 		dev_warn(&ctrl->dev, "FIFO has extra data\n");
 		spmi->prev_fail = true;
 	}
 
+	if (!FIELD_GET(SPMI_REPLY_ACK, reply)) {
+		dev_err(&ctrl->dev, "command not acknowledged\n");
+		return -EIO;
+	}
 	return 0;
 }
 

-- 
2.55.0

Re: [PATCH v4 3/6] spmi: apple: check transaction status

[Janne Grunau]

On Wed, Aug 05, 2026 at 12:11:13PM +0200, Sasha Finkelstein wrote:
> From: Alba Mendez <me@alba.sh>
> 
> Check for parity errors and missing command ACKs
> 
> Signed-off-by: Alba Mendez <me@alba.sh>
> Signed-off-by: Sasha Finkelstein <k@chaosmail.tech>
> ---
>  drivers/spmi/spmi-apple-controller.c | 26 +++++++++++++++++++++-----
>  1 file changed, 21 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/spmi/spmi-apple-controller.c b/drivers/spmi/spmi-apple-controller.c
> index 4d5356bf9bbf..7ebf899edf17 100644
> --- a/drivers/spmi/spmi-apple-controller.c
> +++ b/drivers/spmi/spmi-apple-controller.c
> @@ -11,6 +11,8 @@
>   *		spmi-pmic-arb.c Copyright (c) 2021, The Linux Foundation.
>   */
>  
> +#include <linux/bitfield.h>
> +#include <linux/bits.h>
>  #include <linux/io.h>
>  #include <linux/iopoll.h>
>  #include <linux/module.h>
> @@ -23,6 +25,12 @@
>  #define SPMI_RSP_REG 0x8
>  #define SPMI_ACT_REG 0xa4
>  
> +/* SPMI_RSP_REG reply word */
> +#define SPMI_REPLY_FRAME_PARITY_STATUS GENMASK(31, 16)
> +#define SPMI_REPLY_ACK BIT(15)
> +#define SPMI_REPLY_SLAVE_ID GENMASK(14, 8)
> +#define SPMI_REPLY_CMD GENMASK(7, 0)
> +
>  #define SPMI_ACT_FIFO_FLUSH BIT(0)
>  #define SPMI_RX_FIFO_EMPTY BIT(24)
>  
> @@ -66,7 +74,7 @@ static int spmi_read_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
>  {
>  	struct apple_spmi *spmi = spmi_controller_get_drvdata(ctrl);
>  	u32 spmi_cmd = apple_spmi_pack_cmd(opc, sid, saddr, len);
> -	u32 rsp;
> +	u32 reply, rsp;
>  	size_t len_read = 0;
>  	u8 i;
>  	int ret;
> @@ -82,12 +90,12 @@ static int spmi_read_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
>  	if (ret)
>  		return ret;
>  
> -	/* Discard SPMI reply status */
> -	readl(spmi->regs + SPMI_RSP_REG);
> +	reply = readl(spmi->regs + SPMI_RSP_REG);
>  
>  	/* Read SPMI data reply */
>  	while (len_read < len) {
>  		if (readl(spmi->regs + SPMI_STATUS_REG) & SPMI_RX_FIFO_EMPTY) {
> +			spmi->prev_fail = true;

should this have been in the previous patch? Not sure if the flush helps
in this case but the line looks in this change out-of-place

>  			dev_err_ratelimited(&ctrl->dev,
>  					    "FIFO lacks reply data, controller stuck?\n");
>  			return -EIO;
> @@ -105,6 +113,10 @@ static int spmi_read_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
>  		spmi->prev_fail = true;
>  	}
>  
> +	if (~FIELD_GET(SPMI_REPLY_FRAME_PARITY_STATUS, reply) & ((1 << len) - 1)) {
> +		dev_err(&ctrl->dev, "some frames failed parity check\n");
> +		return -EIO;
> +	}
>  	return 0;
>  }
>  
> @@ -113,6 +125,7 @@ static int spmi_write_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
>  {
>  	struct apple_spmi *spmi = spmi_controller_get_drvdata(ctrl);
>  	u32 spmi_cmd = apple_spmi_pack_cmd(opc, sid, saddr, len);
> +	u32 reply;
>  	size_t i = 0, j;
>  	int ret;
>  
> @@ -136,14 +149,17 @@ static int spmi_write_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
>  	if (ret)
>  		return ret;
>  
> -	/* Discard */
> -	readl(spmi->regs + SPMI_RSP_REG);
> +	reply = readl(spmi->regs + SPMI_RSP_REG);
>  
>  	if (!(readl(spmi->regs + SPMI_STATUS_REG) & SPMI_RX_FIFO_EMPTY)) {
>  		dev_warn(&ctrl->dev, "FIFO has extra data\n");
>  		spmi->prev_fail = true;
>  	}
>  
> +	if (!FIELD_GET(SPMI_REPLY_ACK, reply)) {
> +		dev_err(&ctrl->dev, "command not acknowledged\n");
> +		return -EIO;
> +	}
>  	return 0;
>  }

besides the single misplaced line

Reviewed-by: Janne Grunau <j@jannau.net>

Janne

[PATCH v4 4/6] spmi: apple: Implement remaining commands

[Sasha Finkelstein]

From: Alba Mendez <me@alba.sh>

Add support for zero write and power management commands

Signed-off-by: Alba Mendez <me@alba.sh>
Signed-off-by: Sasha Finkelstein <k@chaosmail.tech>
---
 drivers/spmi/spmi-apple-controller.c | 114 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++----------------------------------------------
 1 file changed, 68 insertions(+), 46 deletions(-)

diff --git a/drivers/spmi/spmi-apple-controller.c b/drivers/spmi/spmi-apple-controller.c
index 7ebf899edf17..49827e51e93e 100644
--- a/drivers/spmi/spmi-apple-controller.c
+++ b/drivers/spmi/spmi-apple-controller.c
@@ -46,9 +46,9 @@ struct apple_spmi {
 	readl_poll_timeout((spmi)->regs + (reg), (val), (cond), \
 			   REG_POLL_INTERVAL_US, REG_POLL_TIMEOUT_US)
 
-static inline u32 apple_spmi_pack_cmd(u8 opc, u8 sid, u16 saddr, size_t len)
+static inline u32 apple_spmi_pack_cmd(u8 opc, u8 sid, u16 param)
 {
-	return opc | sid << 8 | saddr << 16 | (len - 1) | (1 << 15);
+	return opc | sid << 8 | (u32)param << 16 | (1 << 15);
 }
 
 /* Wait for Rx FIFO to have something */
@@ -69,14 +69,14 @@ static int apple_spmi_wait_rx_not_empty(struct spmi_controller *ctrl)
 	return 0;
 }
 
-static int spmi_read_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
-			 u16 saddr, u8 *buf, size_t len)
+static int spmi_raw_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
+			 u16 param, const u8 *buf, size_t len, u8 *ibuf, size_t ilen)
 {
 	struct apple_spmi *spmi = spmi_controller_get_drvdata(ctrl);
-	u32 spmi_cmd = apple_spmi_pack_cmd(opc, sid, saddr, len);
+	u32 spmi_cmd = apple_spmi_pack_cmd(opc, sid, param);
 	u32 reply, rsp;
 	size_t len_read = 0;
-	u8 i;
+	size_t i = 0, j;
 	int ret;
 
 	if (spmi->prev_fail) {
@@ -86,6 +86,14 @@ static int spmi_read_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
 
 	writel(spmi_cmd, spmi->regs + SPMI_CMD_REG);
 
+	while (i < len) {
+		j = min_t(size_t, sizeof(spmi_cmd), len - i);
+		spmi_cmd = 0;
+		memcpy(&spmi_cmd, buf + i, j);
+		writel(spmi_cmd, spmi->regs + SPMI_CMD_REG);
+		i += j;
+	}
+
 	ret = apple_spmi_wait_rx_not_empty(ctrl);
 	if (ret)
 		return ret;
@@ -93,7 +101,7 @@ static int spmi_read_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
 	reply = readl(spmi->regs + SPMI_RSP_REG);
 
 	/* Read SPMI data reply */
-	while (len_read < len) {
+	while (len_read < ilen) {
 		if (readl(spmi->regs + SPMI_STATUS_REG) & SPMI_RX_FIFO_EMPTY) {
 			spmi->prev_fail = true;
 			dev_err_ratelimited(&ctrl->dev,
@@ -101,11 +109,9 @@ static int spmi_read_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
 			return -EIO;
 		}
 		rsp = readl(spmi->regs + SPMI_RSP_REG);
-		i = 0;
-		while ((len_read < len) && (i < 4)) {
-			buf[len_read++] = ((0xff << (8 * i)) & rsp) >> (8 * i);
-			i += 1;
-		}
+		i = min_t(size_t, sizeof(spmi_cmd), ilen - len_read);
+		memcpy(ibuf + len_read, &rsp, i);
+		len_read += i;
 	}
 
 	if (!(readl(spmi->regs + SPMI_STATUS_REG) & SPMI_RX_FIFO_EMPTY)) {
@@ -113,54 +119,69 @@ static int spmi_read_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
 		spmi->prev_fail = true;
 	}
 
-	if (~FIELD_GET(SPMI_REPLY_FRAME_PARITY_STATUS, reply) & ((1 << len) - 1)) {
+	if (!ilen && !FIELD_GET(SPMI_REPLY_ACK, reply)) {
+		dev_err(&ctrl->dev, "command not acknowledged\n");
+		return -EIO;
+	}
+	if (~FIELD_GET(SPMI_REPLY_FRAME_PARITY_STATUS, reply) & ((1 << ilen) - 1)) {
 		dev_err(&ctrl->dev, "some frames failed parity check\n");
 		return -EIO;
 	}
 	return 0;
 }
 
-static int spmi_write_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
-			  u16 saddr, const u8 *buf, size_t len)
+/* Send a raw command with 1..16 input data frames */
+static int spmi_raw_cmd_input(struct spmi_controller *ctrl, u8 opc, u8 sid,
+			 u16 param, u8 *buf, size_t len)
 {
-	struct apple_spmi *spmi = spmi_controller_get_drvdata(ctrl);
-	u32 spmi_cmd = apple_spmi_pack_cmd(opc, sid, saddr, len);
-	u32 reply;
-	size_t i = 0, j;
-	int ret;
-
-	if (spmi->prev_fail) {
-		writel(SPMI_ACT_FIFO_FLUSH, spmi->regs + SPMI_RSP_REG);
-		spmi->prev_fail = false;
-	}
-
-	writel(spmi_cmd, spmi->regs + SPMI_CMD_REG);
+	return spmi_raw_cmd(ctrl, opc, sid, param, NULL, 0, buf, len);
+}
 
-	while (i < len) {
-		j = 0;
-		spmi_cmd = 0;
-		while ((j < 4) & (i < len))
-			spmi_cmd |= buf[i++] << (j++ * 8);
+/* Send a raw command with (optional) body and an input ACK */
+static int spmi_raw_cmd_ack(struct spmi_controller *ctrl, u8 opc, u8 sid,
+			  u16 param, const u8 *buf, size_t len)
+{
+	return spmi_raw_cmd(ctrl, opc, sid, param, buf, len, NULL, 0);
+}
 
-		writel(spmi_cmd, spmi->regs + SPMI_CMD_REG);
+static int spmi_read_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
+			 u16 saddr, u8 *buf, size_t len)
+{
+	switch (opc) {
+	case SPMI_CMD_EXT_READ:
+	case SPMI_CMD_EXT_READL:
+		return spmi_raw_cmd_input(ctrl, opc | (len - 1), sid, saddr, buf, len);
+	case SPMI_CMD_READ:
+		return spmi_raw_cmd_input(ctrl, opc | saddr, sid, saddr, buf, len);
 	}
+	return -EINVAL;
+}
 
-	ret = apple_spmi_wait_rx_not_empty(ctrl);
-	if (ret)
-		return ret;
-
-	reply = readl(spmi->regs + SPMI_RSP_REG);
-
-	if (!(readl(spmi->regs + SPMI_STATUS_REG) & SPMI_RX_FIFO_EMPTY)) {
-		dev_warn(&ctrl->dev, "FIFO has extra data\n");
-		spmi->prev_fail = true;
+static int spmi_write_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
+			  u16 saddr, const u8 *buf, size_t len)
+{
+	switch (opc) {
+	case SPMI_CMD_WRITE:
+		return spmi_raw_cmd_ack(ctrl, opc | saddr, sid, buf[0] << 8 | saddr, NULL, 0);
+	case SPMI_CMD_ZERO_WRITE:
+		return spmi_raw_cmd_ack(ctrl, opc | buf[0], sid, buf[0] << 8 | saddr, NULL, 0);
+	case SPMI_CMD_EXT_WRITE:
+	case SPMI_CMD_EXT_WRITEL:
+		return spmi_raw_cmd_ack(ctrl, opc | (len - 1), sid, saddr, buf, len);
 	}
+	return -EINVAL;
+}
 
-	if (!FIELD_GET(SPMI_REPLY_ACK, reply)) {
-		dev_err(&ctrl->dev, "command not acknowledged\n");
-		return -EIO;
+static int spmi_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid)
+{
+	switch (opc) {
+	case SPMI_CMD_RESET:
+	case SPMI_CMD_SLEEP:
+	case SPMI_CMD_SHUTDOWN:
+	case SPMI_CMD_WAKEUP:
+		return spmi_raw_cmd_ack(ctrl, opc, sid, 0, NULL, 0);
 	}
-	return 0;
+	return -EINVAL;
 }
 
 static int apple_spmi_probe(struct platform_device *pdev)
@@ -183,6 +204,7 @@ static int apple_spmi_probe(struct platform_device *pdev)
 
 	ctrl->read_cmd = spmi_read_cmd;
 	ctrl->write_cmd = spmi_write_cmd;
+	ctrl->cmd = spmi_cmd;
 
 	ret = devm_spmi_controller_add(&pdev->dev, ctrl);
 	if (ret)

-- 
2.55.0

Re: [PATCH v4 4/6] spmi: apple: Implement remaining commands

[Janne Grunau]

On Wed, Aug 05, 2026 at 12:11:14PM +0200, Sasha Finkelstein wrote:
> From: Alba Mendez <me@alba.sh>
> 
> Add support for zero write and power management commands

missing dot at the end of the sentence.

> Signed-off-by: Alba Mendez <me@alba.sh>
> Signed-off-by: Sasha Finkelstein <k@chaosmail.tech>
> ---
>  drivers/spmi/spmi-apple-controller.c | 114 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++----------------------------------------------
>  1 file changed, 68 insertions(+), 46 deletions(-)
> 
> diff --git a/drivers/spmi/spmi-apple-controller.c b/drivers/spmi/spmi-apple-controller.c
> index 7ebf899edf17..49827e51e93e 100644
> --- a/drivers/spmi/spmi-apple-controller.c
> +++ b/drivers/spmi/spmi-apple-controller.c
> @@ -46,9 +46,9 @@ struct apple_spmi {
>  	readl_poll_timeout((spmi)->regs + (reg), (val), (cond), \
>  			   REG_POLL_INTERVAL_US, REG_POLL_TIMEOUT_US)
>  
> -static inline u32 apple_spmi_pack_cmd(u8 opc, u8 sid, u16 saddr, size_t len)
> +static inline u32 apple_spmi_pack_cmd(u8 opc, u8 sid, u16 param)
>  {
> -	return opc | sid << 8 | saddr << 16 | (len - 1) | (1 << 15);
> +	return opc | sid << 8 | (u32)param << 16 | (1 << 15);
>  }
>  
>  /* Wait for Rx FIFO to have something */
> @@ -69,14 +69,14 @@ static int apple_spmi_wait_rx_not_empty(struct spmi_controller *ctrl)
>  	return 0;
>  }
>  
> -static int spmi_read_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
> -			 u16 saddr, u8 *buf, size_t len)
> +static int spmi_raw_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
> +			 u16 param, const u8 *buf, size_t len, u8 *ibuf, size_t ilen)

Instead of two sets of not very distinctive variable names ("buf"/"len",
"ibuf"/ilen") please use just buf/len and a boolean to indicate whether
the command is a read or write if you insists of routing all commands
through a single function. This can be simply added as first condition
in the "while" iterating over the write/read buffers.

>  {
>  	struct apple_spmi *spmi = spmi_controller_get_drvdata(ctrl);
> -	u32 spmi_cmd = apple_spmi_pack_cmd(opc, sid, saddr, len);
> +	u32 spmi_cmd = apple_spmi_pack_cmd(opc, sid, param);
>  	u32 reply, rsp;
>  	size_t len_read = 0;
> -	u8 i;
> +	size_t i = 0, j;
>  	int ret;
>  
>  	if (spmi->prev_fail) {
> @@ -86,6 +86,14 @@ static int spmi_read_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
>  
>  	writel(spmi_cmd, spmi->regs + SPMI_CMD_REG);
>  
> +	while (i < len) {
> +		j = min_t(size_t, sizeof(spmi_cmd), len - i);
> +		spmi_cmd = 0;
> +		memcpy(&spmi_cmd, buf + i, j);
> +		writel(spmi_cmd, spmi->regs + SPMI_CMD_REG);
> +		i += j;
> +	}
> +
>  	ret = apple_spmi_wait_rx_not_empty(ctrl);
>  	if (ret)
>  		return ret;
> @@ -93,7 +101,7 @@ static int spmi_read_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
>  	reply = readl(spmi->regs + SPMI_RSP_REG);
>  
>  	/* Read SPMI data reply */
> -	while (len_read < len) {
> +	while (len_read < ilen) {
>  		if (readl(spmi->regs + SPMI_STATUS_REG) & SPMI_RX_FIFO_EMPTY) {
>  			spmi->prev_fail = true;
>  			dev_err_ratelimited(&ctrl->dev,
> @@ -101,11 +109,9 @@ static int spmi_read_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
>  			return -EIO;
>  		}
>  		rsp = readl(spmi->regs + SPMI_RSP_REG);
> -		i = 0;
> -		while ((len_read < len) && (i < 4)) {
> -			buf[len_read++] = ((0xff << (8 * i)) & rsp) >> (8 * i);
> -			i += 1;
> -		}
> +		i = min_t(size_t, sizeof(spmi_cmd), ilen - len_read);
> +		memcpy(ibuf + len_read, &rsp, i);
> +		len_read += i;
>  	}
>  
>  	if (!(readl(spmi->regs + SPMI_STATUS_REG) & SPMI_RX_FIFO_EMPTY)) {
> @@ -113,54 +119,69 @@ static int spmi_read_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
>  		spmi->prev_fail = true;
>  	}
>  
> -	if (~FIELD_GET(SPMI_REPLY_FRAME_PARITY_STATUS, reply) & ((1 << len) - 1)) {
> +	if (!ilen && !FIELD_GET(SPMI_REPLY_ACK, reply)) {
> +		dev_err(&ctrl->dev, "command not acknowledged\n");
> +		return -EIO;
> +	}
> +	if (~FIELD_GET(SPMI_REPLY_FRAME_PARITY_STATUS, reply) & ((1 << ilen) - 1)) {
>  		dev_err(&ctrl->dev, "some frames failed parity check\n");
>  		return -EIO;
>  	}
>  	return 0;
>  }
>  
> -static int spmi_write_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
> -			  u16 saddr, const u8 *buf, size_t len)
> +/* Send a raw command with 1..16 input data frames */
> +static int spmi_raw_cmd_input(struct spmi_controller *ctrl, u8 opc, u8 sid,
> +			 u16 param, u8 *buf, size_t len)
>  {
> -	struct apple_spmi *spmi = spmi_controller_get_drvdata(ctrl);
> -	u32 spmi_cmd = apple_spmi_pack_cmd(opc, sid, saddr, len);
> -	u32 reply;
> -	size_t i = 0, j;
> -	int ret;
> -
> -	if (spmi->prev_fail) {
> -		writel(SPMI_ACT_FIFO_FLUSH, spmi->regs + SPMI_RSP_REG);
> -		spmi->prev_fail = false;
> -	}
> -
> -	writel(spmi_cmd, spmi->regs + SPMI_CMD_REG);
> +	return spmi_raw_cmd(ctrl, opc, sid, param, NULL, 0, buf, len);
> +}
>  
> -	while (i < len) {
> -		j = 0;
> -		spmi_cmd = 0;
> -		while ((j < 4) & (i < len))
> -			spmi_cmd |= buf[i++] << (j++ * 8);
> +/* Send a raw command with (optional) body and an input ACK */
> +static int spmi_raw_cmd_ack(struct spmi_controller *ctrl, u8 opc, u8 sid,
> +			  u16 param, const u8 *buf, size_t len)
> +{
> +	return spmi_raw_cmd(ctrl, opc, sid, param, buf, len, NULL, 0);
> +}
>  
> -		writel(spmi_cmd, spmi->regs + SPMI_CMD_REG);
> +static int spmi_read_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
> +			 u16 saddr, u8 *buf, size_t len)
> +{
> +	switch (opc) {
> +	case SPMI_CMD_EXT_READ:
> +	case SPMI_CMD_EXT_READL:
> +		return spmi_raw_cmd_input(ctrl, opc | (len - 1), sid, saddr, buf, len);
> +	case SPMI_CMD_READ:
> +		return spmi_raw_cmd_input(ctrl, opc | saddr, sid, saddr, buf, len);
>  	}
> +	return -EINVAL;
> +}
>  
> -	ret = apple_spmi_wait_rx_not_empty(ctrl);
> -	if (ret)
> -		return ret;
> -
> -	reply = readl(spmi->regs + SPMI_RSP_REG);
> -
> -	if (!(readl(spmi->regs + SPMI_STATUS_REG) & SPMI_RX_FIFO_EMPTY)) {
> -		dev_warn(&ctrl->dev, "FIFO has extra data\n");
> -		spmi->prev_fail = true;
> +static int spmi_write_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
> +			  u16 saddr, const u8 *buf, size_t len)
> +{
> +	switch (opc) {
> +	case SPMI_CMD_WRITE:
> +		return spmi_raw_cmd_ack(ctrl, opc | saddr, sid, buf[0] << 8 | saddr, NULL, 0);
> +	case SPMI_CMD_ZERO_WRITE:
> +		return spmi_raw_cmd_ack(ctrl, opc | buf[0], sid, buf[0] << 8 | saddr, NULL, 0);
> +	case SPMI_CMD_EXT_WRITE:
> +	case SPMI_CMD_EXT_WRITEL:
> +		return spmi_raw_cmd_ack(ctrl, opc | (len - 1), sid, saddr, buf, len);
>  	}
> +	return -EINVAL;
> +}
>  
> -	if (!FIELD_GET(SPMI_REPLY_ACK, reply)) {
> -		dev_err(&ctrl->dev, "command not acknowledged\n");
> -		return -EIO;
> +static int spmi_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid)
> +{
> +	switch (opc) {
> +	case SPMI_CMD_RESET:
> +	case SPMI_CMD_SLEEP:
> +	case SPMI_CMD_SHUTDOWN:
> +	case SPMI_CMD_WAKEUP:
> +		return spmi_raw_cmd_ack(ctrl, opc, sid, 0, NULL, 0);
>  	}
> -	return 0;
> +	return -EINVAL;
>  }
>  
>  static int apple_spmi_probe(struct platform_device *pdev)
> @@ -183,6 +204,7 @@ static int apple_spmi_probe(struct platform_device *pdev)
>  
>  	ctrl->read_cmd = spmi_read_cmd;
>  	ctrl->write_cmd = spmi_write_cmd;
> +	ctrl->cmd = spmi_cmd;
>  
>  	ret = devm_spmi_controller_add(&pdev->dev, ctrl);
>  	if (ret)

looks good otherwise

Janne

Re: [PATCH v4 4/6] spmi: apple: Implement remaining commands

[Sasha Finkelstein]

On Aug 5, 2026, at 14:19, Janne Grunau <j@jannau.net> wrote:
>> 
>> -static int spmi_read_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
>> -  u16 saddr, u8 *buf, size_t len)
>> +static int spmi_raw_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
>> +  u16 param, const u8 *buf, size_t len, u8 *ibuf, size_t ilen)
> 
> Instead of two sets of not very distinctive variable names ("buf"/"len",
> "ibuf"/ilen") please use just buf/len and a boolean to indicate whether
> the command is a read or write if you insists of routing all commands
> through a single function. This can be simply added as first condition
> in the "while" iterating over the write/read buffers.

Tried it, ended up not working, as the buffers differ in constness

[PATCH v4 5/6] spmi: apple: lock around FIFOs

[Sasha Finkelstein]

From: Alba Mendez <me@alba.sh>

The driver was missing locking around register interactions

Signed-off-by: Alba Mendez <me@alba.sh>
Signed-off-by: Sasha Finkelstein <k@chaosmail.tech>
---
 drivers/spmi/spmi-apple-controller.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/spmi/spmi-apple-controller.c b/drivers/spmi/spmi-apple-controller.c
index 49827e51e93e..c3bc1f6d5741 100644
--- a/drivers/spmi/spmi-apple-controller.c
+++ b/drivers/spmi/spmi-apple-controller.c
@@ -16,6 +16,7 @@
 #include <linux/io.h>
 #include <linux/iopoll.h>
 #include <linux/module.h>
+#include <linux/mutex.h>
 #include <linux/platform_device.h>
 #include <linux/spmi.h>
 
@@ -39,6 +40,7 @@
 
 struct apple_spmi {
 	void __iomem *regs;
+	struct mutex fifo_lock;
 	bool prev_fail;
 };
 
@@ -79,6 +81,8 @@ static int spmi_raw_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
 	size_t i = 0, j;
 	int ret;
 
+	guard(mutex)(&spmi->fifo_lock);
+
 	if (spmi->prev_fail) {
 		writel(SPMI_ACT_FIFO_FLUSH, spmi->regs + SPMI_RSP_REG);
 		spmi->prev_fail = false;
@@ -195,6 +199,7 @@ static int apple_spmi_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	spmi = spmi_controller_get_drvdata(ctrl);
+	mutex_init(&spmi->fifo_lock);
 
 	spmi->regs = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(spmi->regs))

-- 
2.55.0

Re: [PATCH v4 5/6] spmi: apple: lock around FIFOs

[Janne Grunau]

On Wed, Aug 05, 2026 at 12:11:15PM +0200, Sasha Finkelstein wrote:
> From: Alba Mendez <me@alba.sh>
> 
> The driver was missing locking around register interactions

Missing '.' a the end of the sentence.
 
> Signed-off-by: Alba Mendez <me@alba.sh>
> Signed-off-by: Sasha Finkelstein <k@chaosmail.tech>
> ---
>  drivers/spmi/spmi-apple-controller.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/spmi/spmi-apple-controller.c b/drivers/spmi/spmi-apple-controller.c
> index 49827e51e93e..c3bc1f6d5741 100644
> --- a/drivers/spmi/spmi-apple-controller.c
> +++ b/drivers/spmi/spmi-apple-controller.c
> @@ -16,6 +16,7 @@
>  #include <linux/io.h>
>  #include <linux/iopoll.h>
>  #include <linux/module.h>
> +#include <linux/mutex.h>
>  #include <linux/platform_device.h>
>  #include <linux/spmi.h>
>  
> @@ -39,6 +40,7 @@
>  
>  struct apple_spmi {
>  	void __iomem *regs;
> +	struct mutex fifo_lock;
>  	bool prev_fail;
>  };
>  
> @@ -79,6 +81,8 @@ static int spmi_raw_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
>  	size_t i = 0, j;
>  	int ret;
>  
> +	guard(mutex)(&spmi->fifo_lock);
> +
>  	if (spmi->prev_fail) {
>  		writel(SPMI_ACT_FIFO_FLUSH, spmi->regs + SPMI_RSP_REG);
>  		spmi->prev_fail = false;
> @@ -195,6 +199,7 @@ static int apple_spmi_probe(struct platform_device *pdev)
>  		return -ENOMEM;
>  
>  	spmi = spmi_controller_get_drvdata(ctrl);
> +	mutex_init(&spmi->fifo_lock);
>  
>  	spmi->regs = devm_platform_ioremap_resource(pdev, 0);
>  	if (IS_ERR(spmi->regs))

Reviewed-by: Janne Grunau <j@jannau.net>

Janne

[PATCH v4 6/6] spmi: apple: Add interrupt functionality

[Sasha Finkelstein]

From: Alba Mendez <me@alba.sh>

Add support for interrupts sent by slave devices and use IRQ for
RX FIFO if possible, as that IRQ fires as soon as the reply is
available, which is usually takes a few us instead of the 10ms sleep
interval for polling

Signed-off-by: Alba Mendez <me@alba.sh>
Signed-off-by: Sasha Finkelstein <k@chaosmail.tech>
---
 drivers/spmi/Kconfig                 |   3 +-
 drivers/spmi/spmi-apple-controller.c | 254 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 255 insertions(+), 2 deletions(-)

diff --git a/drivers/spmi/Kconfig b/drivers/spmi/Kconfig
index a80cf4047b86..7243863a09b4 100644
--- a/drivers/spmi/Kconfig
+++ b/drivers/spmi/Kconfig
@@ -13,7 +13,8 @@ if SPMI
 
 config SPMI_APPLE
 	tristate "Apple SoC SPMI Controller platform driver"
-	depends on ARCH_APPLE || COMPILE_TEST
+	select IRQ_DOMAIN_HIERARCHY
+	depends on ARCH_APPLE || (COMPILE_TEST && 64BIT)
 	help
 	  If you say yes to this option, support will be included for the
 	  SPMI controller present on many Apple SoCs, including the
diff --git a/drivers/spmi/spmi-apple-controller.c b/drivers/spmi/spmi-apple-controller.c
index c3bc1f6d5741..7e86d7983fb4 100644
--- a/drivers/spmi/spmi-apple-controller.c
+++ b/drivers/spmi/spmi-apple-controller.c
@@ -13,11 +13,17 @@
 
 #include <linux/bitfield.h>
 #include <linux/bits.h>
+#include <linux/completion.h>
+#include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/iopoll.h>
+#include <linux/irq.h>
+#include <linux/irqchip/chained_irq.h>
+#include <linux/irqdomain.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
 #include <linux/platform_device.h>
+#include <linux/spinlock.h>
 #include <linux/spmi.h>
 
 /* SPMI Controller Registers */
@@ -26,6 +32,13 @@
 #define SPMI_RSP_REG 0x8
 #define SPMI_ACT_REG 0xa4
 
+#define SPMI_IRQ_MASK_BASE 0x20
+#define SPMI_IRQ_ACK_BASE 0x60
+#define SPMI_NUM_PERIPHERAL_IRQS 256
+#define SPMI_NUM_IRQS (SPMI_NUM_PERIPHERAL_IRQS + 32)
+
+#define SPMI_IRQ_NOTIFY 256
+
 /* SPMI_RSP_REG reply word */
 #define SPMI_REPLY_FRAME_PARITY_STATUS GENMASK(31, 16)
 #define SPMI_REPLY_ACK BIT(15)
@@ -41,6 +54,12 @@
 struct apple_spmi {
 	void __iomem *regs;
 	struct mutex fifo_lock;
+	struct completion fifo_rx;
+	struct irq_domain *irqd;
+	raw_spinlock_t irq_mask_lock;
+	DECLARE_BITMAP(irq_mask_cache, SPMI_NUM_PERIPHERAL_IRQS);
+	int irq;
+	bool notify_irq;
 	bool prev_fail;
 };
 
@@ -48,6 +67,56 @@ struct apple_spmi {
 	readl_poll_timeout((spmi)->regs + (reg), (val), (cond), \
 			   REG_POLL_INTERVAL_US, REG_POLL_TIMEOUT_US)
 
+static void apple_spmi_irq_ack_raw(struct apple_spmi *spmi, u32 irq)
+{
+	u32 __iomem *reg = spmi->regs + SPMI_IRQ_ACK_BASE + (irq / 32) * 4;
+
+	writel(BIT(irq % 32), reg);
+}
+
+static void apple_spmi_irq_mask_raw(struct apple_spmi *spmi, u32 irq)
+{
+	u32 __iomem *reg = spmi->regs + SPMI_IRQ_MASK_BASE + (irq / 32) * 4;
+
+	writel(readl(reg) & ~BIT(irq % 32), reg);
+}
+
+static void apple_spmi_irq_unmask_raw(struct apple_spmi *spmi, u32 irq)
+{
+	u32 __iomem *reg = spmi->regs + SPMI_IRQ_MASK_BASE + (irq / 32) * 4;
+
+	writel(readl(reg) | BIT(irq % 32), reg);
+}
+
+static void apple_spmi_irq_ack(struct irq_data *d)
+{
+	struct apple_spmi *spmi = irq_data_get_irq_chip_data(d);
+
+	apple_spmi_irq_ack_raw(spmi, d->hwirq);
+}
+
+static void apple_spmi_irq_mask(struct irq_data *d)
+{
+	struct apple_spmi *spmi = irq_data_get_irq_chip_data(d);
+	unsigned long flags;
+
+	raw_spin_lock_irqsave(&spmi->irq_mask_lock, flags);
+	apple_spmi_irq_mask_raw(spmi, d->hwirq);
+	clear_bit(d->hwirq, spmi->irq_mask_cache);
+	raw_spin_unlock_irqrestore(&spmi->irq_mask_lock, flags);
+}
+
+static void apple_spmi_irq_unmask(struct irq_data *d)
+{
+	struct apple_spmi *spmi = irq_data_get_irq_chip_data(d);
+	unsigned long flags;
+
+	raw_spin_lock_irqsave(&spmi->irq_mask_lock, flags);
+	set_bit(d->hwirq, spmi->irq_mask_cache);
+	apple_spmi_irq_unmask_raw(spmi, d->hwirq);
+	raw_spin_unlock_irqrestore(&spmi->irq_mask_lock, flags);
+}
+
 static inline u32 apple_spmi_pack_cmd(u8 opc, u8 sid, u16 param)
 {
 	return opc | sid << 8 | (u32)param << 16 | (1 << 15);
@@ -60,7 +129,19 @@ static int apple_spmi_wait_rx_not_empty(struct spmi_controller *ctrl)
 	int ret;
 	u32 status;
 
-	ret = poll_reg(spmi, SPMI_STATUS_REG, status, !(status & SPMI_RX_FIFO_EMPTY));
+	if (spmi->notify_irq) {
+		ret = wait_for_completion_timeout(&spmi->fifo_rx,
+			usecs_to_jiffies(REG_POLL_TIMEOUT_US));
+		if (!ret)
+			ret = -ETIMEDOUT;
+		else if (readl(spmi->regs + SPMI_STATUS_REG) & SPMI_RX_FIFO_EMPTY)
+			ret = -EIO;
+		else
+			ret = 0;
+	} else {
+		ret = poll_reg(spmi, SPMI_STATUS_REG, status, !(status & SPMI_RX_FIFO_EMPTY));
+	}
+
 	if (ret) {
 		spmi->prev_fail = true;
 		dev_err(&ctrl->dev,
@@ -85,8 +166,10 @@ static int spmi_raw_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
 
 	if (spmi->prev_fail) {
 		writel(SPMI_ACT_FIFO_FLUSH, spmi->regs + SPMI_RSP_REG);
+		apple_spmi_irq_ack_raw(spmi, SPMI_IRQ_NOTIFY);
 		spmi->prev_fail = false;
 	}
+	reinit_completion(&spmi->fifo_rx);
 
 	writel(spmi_cmd, spmi->regs + SPMI_CMD_REG);
 
@@ -188,6 +271,164 @@ static int spmi_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid)
 	return -EINVAL;
 }
 
+static int apple_spmi_irq_set_type(struct irq_data *d, unsigned int type)
+{
+	/* all interrupts have MSI semantics */
+	return type == IRQ_TYPE_EDGE_RISING ? 0 : -EINVAL;
+}
+
+static struct irq_chip apple_spmi_irq_chip = {
+	.name = "apple_spmi",
+	.irq_mask = apple_spmi_irq_mask,
+	.irq_unmask = apple_spmi_irq_unmask,
+	.irq_ack = apple_spmi_irq_ack,
+	.irq_set_type = apple_spmi_irq_set_type,
+	.flags = IRQCHIP_ONESHOT_SAFE,
+};
+
+static int apple_spmi_irq_domain_map(struct irq_domain *irqd,
+					unsigned int irq, irq_hw_number_t hw)
+{
+	irq_domain_set_info(irqd, irq, hw, &apple_spmi_irq_chip, irqd->host_data,
+				handle_edge_irq, NULL, NULL);
+	return 0;
+}
+
+static int apple_spmi_irq_domain_translate(struct irq_domain *irqd,
+					struct irq_fwspec *fwspec,
+					unsigned long *hwirq,
+					unsigned int *type)
+{
+	u32 *args = fwspec->param;
+
+	if (fwspec->param_count != 2)
+		return -EINVAL;
+
+	if (args[0] >= SPMI_NUM_PERIPHERAL_IRQS)
+		return -EINVAL;
+	*hwirq = args[0];
+	*type = args[1] & IRQ_TYPE_SENSE_MASK;
+	return 0;
+}
+
+static int apple_spmi_irq_domain_alloc(struct irq_domain *irqd, unsigned int virq,
+				unsigned int nr_irqs, void *arg)
+{
+	unsigned int type = IRQ_TYPE_NONE;
+	struct irq_fwspec *fwspec = arg;
+	irq_hw_number_t hwirq;
+	int i, ret;
+
+	ret = apple_spmi_irq_domain_translate(irqd, fwspec, &hwirq, &type);
+	if (ret)
+		return ret;
+
+	if (hwirq + nr_irqs > SPMI_NUM_PERIPHERAL_IRQS)
+		return -EINVAL;
+
+	for (i = 0; i < nr_irqs; i++) {
+		ret = apple_spmi_irq_domain_map(irqd, virq + i, hwirq + i);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static void apple_spmi_irq_domain_free(struct irq_domain *irqd, unsigned int virq,
+				unsigned int nr_irqs)
+{
+	int i;
+
+	for (i = 0; i < nr_irqs; i++) {
+		struct irq_data *d = irq_domain_get_irq_data(irqd, virq + i);
+
+		irq_set_handler(virq + i, NULL);
+		irq_domain_reset_irq_data(d);
+	}
+}
+
+static const struct irq_domain_ops apple_spmi_irq_domain_ops = {
+	.translate	= apple_spmi_irq_domain_translate,
+	.alloc		= apple_spmi_irq_domain_alloc,
+	.free		= apple_spmi_irq_domain_free,
+};
+
+static void apple_spmi_irq_handler(struct irq_desc *desc)
+{
+	struct apple_spmi *spmi = irq_desc_get_handler_data(desc);
+	struct irq_chip *chip = irq_desc_get_chip(desc);
+	bool handled = false;
+	unsigned long val, offset, bit;
+
+	chained_irq_enter(chip, desc);
+	val = readl(spmi->regs + SPMI_IRQ_ACK_BASE + (SPMI_IRQ_NOTIFY / 32) * 4);
+	if (val & BIT(SPMI_IRQ_NOTIFY % 32)) {
+		apple_spmi_irq_ack_raw(spmi, SPMI_IRQ_NOTIFY);
+		complete(&spmi->fifo_rx);
+		handled = true;
+	}
+
+	for (offset = 0; offset < SPMI_NUM_PERIPHERAL_IRQS / 8; offset += sizeof(val)) {
+		val = readq(spmi->regs + SPMI_IRQ_ACK_BASE + offset);
+		/**
+		 * because of other masters in the bus, we're going to get a multitude of
+		 * interrupts we're not interested in. irq_resolve_mapping isn't very
+		 * optimized for the nonexistent path, so instead we mask with (a locally
+		 * cached version of) the IRQ mask
+		 */
+		val &= spmi->irq_mask_cache[offset / sizeof(val)];
+		for_each_set_bit(bit, &val, 64) {
+			generic_handle_domain_irq(spmi->irqd, offset * 8 + bit);
+			handled = true;
+			val &= ~BIT(bit);
+		}
+	}
+	if (!handled)
+		handle_bad_irq(desc);
+	chained_irq_exit(chip, desc);
+}
+
+static void remove_chained_handler(void *data)
+{
+	unsigned int irq = (unsigned int)(uintptr_t)data;
+
+	irq_set_chained_handler_and_data(irq, NULL, NULL);
+}
+
+static int apple_spmi_init_irq(struct platform_device *pdev,
+			  struct apple_spmi *spmi, int irq)
+{
+	int ret;
+	struct irq_domain_info info = {
+		.fwnode		= pdev->dev.fwnode,
+		.hwirq_max	= ~0U,
+		.ops		= &apple_spmi_irq_domain_ops,
+		.host_data	= spmi,
+	};
+
+	raw_spin_lock_init(&spmi->irq_mask_lock);
+
+	for (size_t offset = 0; offset < SPMI_NUM_IRQS / 8; offset += 4) {
+		writel(0, spmi->regs + SPMI_IRQ_MASK_BASE + offset);
+		writel(U32_MAX, spmi->regs + SPMI_IRQ_ACK_BASE + offset);
+	}
+
+	spmi->irqd = devm_irq_domain_instantiate(&pdev->dev, &info);
+	if (IS_ERR(spmi->irqd))
+		return PTR_ERR(spmi->irqd);
+
+	spmi->notify_irq = true;
+	ret = devm_add_action(&pdev->dev, remove_chained_handler, (void *)(uintptr_t)spmi->irq);
+	if (ret)
+		return ret;
+
+	irq_set_chained_handler_and_data(spmi->irq, apple_spmi_irq_handler, spmi);
+	apple_spmi_irq_unmask_raw(spmi, SPMI_IRQ_NOTIFY);
+
+	return 0;
+}
+
 static int apple_spmi_probe(struct platform_device *pdev)
 {
 	struct apple_spmi *spmi;
@@ -200,6 +441,8 @@ static int apple_spmi_probe(struct platform_device *pdev)
 
 	spmi = spmi_controller_get_drvdata(ctrl);
 	mutex_init(&spmi->fifo_lock);
+	init_completion(&spmi->fifo_rx);
+	platform_set_drvdata(pdev, spmi);
 
 	spmi->regs = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(spmi->regs))
@@ -211,6 +454,15 @@ static int apple_spmi_probe(struct platform_device *pdev)
 	ctrl->write_cmd = spmi_write_cmd;
 	ctrl->cmd = spmi_cmd;
 
+	spmi->irq = platform_get_irq_optional(pdev, 0);
+	if (spmi->irq < 0 && spmi->irq != -ENXIO)
+		return spmi->irq;
+	if (spmi->irq >= 0) {
+		ret = apple_spmi_init_irq(pdev, spmi, spmi->irq);
+		if (ret)
+			return ret;
+	}
+
 	ret = devm_spmi_controller_add(&pdev->dev, ctrl);
 	if (ret)
 		return dev_err_probe(&pdev->dev, ret,

-- 
2.55.0

Re: [PATCH v4 6/6] spmi: apple: Add interrupt functionality

[Janne Grunau]

On Wed, Aug 05, 2026 at 12:11:16PM +0200, Sasha Finkelstein wrote:
> From: Alba Mendez <me@alba.sh>
> 
> Add support for interrupts sent by slave devices and use IRQ for
> RX FIFO if possible, as that IRQ fires as soon as the reply is
> available, which is usually takes a few us instead of the 10ms sleep
> interval for polling

same as for the other changes, better check all of them because I
probably missed that before.

> Signed-off-by: Alba Mendez <me@alba.sh>
> Signed-off-by: Sasha Finkelstein <k@chaosmail.tech>
> ---
>  drivers/spmi/Kconfig                 |   3 +-
>  drivers/spmi/spmi-apple-controller.c | 254 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
>  2 files changed, 255 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/spmi/Kconfig b/drivers/spmi/Kconfig
> index a80cf4047b86..7243863a09b4 100644
> --- a/drivers/spmi/Kconfig
> +++ b/drivers/spmi/Kconfig
> @@ -13,7 +13,8 @@ if SPMI
>  
>  config SPMI_APPLE
>  	tristate "Apple SoC SPMI Controller platform driver"
> -	depends on ARCH_APPLE || COMPILE_TEST
> +	select IRQ_DOMAIN_HIERARCHY
> +	depends on ARCH_APPLE || (COMPILE_TEST && 64BIT)
>  	help
>  	  If you say yes to this option, support will be included for the
>  	  SPMI controller present on many Apple SoCs, including the
> diff --git a/drivers/spmi/spmi-apple-controller.c b/drivers/spmi/spmi-apple-controller.c
> index c3bc1f6d5741..7e86d7983fb4 100644
> --- a/drivers/spmi/spmi-apple-controller.c
> +++ b/drivers/spmi/spmi-apple-controller.c
> @@ -13,11 +13,17 @@
>  
>  #include <linux/bitfield.h>
>  #include <linux/bits.h>
> +#include <linux/completion.h>
> +#include <linux/interrupt.h>
>  #include <linux/io.h>
>  #include <linux/iopoll.h>
> +#include <linux/irq.h>
> +#include <linux/irqchip/chained_irq.h>
> +#include <linux/irqdomain.h>
>  #include <linux/module.h>
>  #include <linux/mutex.h>
>  #include <linux/platform_device.h>
> +#include <linux/spinlock.h>
>  #include <linux/spmi.h>
>  
>  /* SPMI Controller Registers */
> @@ -26,6 +32,13 @@
>  #define SPMI_RSP_REG 0x8
>  #define SPMI_ACT_REG 0xa4
>  
> +#define SPMI_IRQ_MASK_BASE 0x20
> +#define SPMI_IRQ_ACK_BASE 0x60
> +#define SPMI_NUM_PERIPHERAL_IRQS 256
> +#define SPMI_NUM_IRQS (SPMI_NUM_PERIPHERAL_IRQS + 32)
> +
> +#define SPMI_IRQ_NOTIFY 256
> +
>  /* SPMI_RSP_REG reply word */
>  #define SPMI_REPLY_FRAME_PARITY_STATUS GENMASK(31, 16)
>  #define SPMI_REPLY_ACK BIT(15)
> @@ -41,6 +54,12 @@
>  struct apple_spmi {
>  	void __iomem *regs;
>  	struct mutex fifo_lock;
> +	struct completion fifo_rx;
> +	struct irq_domain *irqd;
> +	raw_spinlock_t irq_mask_lock;
> +	DECLARE_BITMAP(irq_mask_cache, SPMI_NUM_PERIPHERAL_IRQS);
> +	int irq;
> +	bool notify_irq;
>  	bool prev_fail;
>  };
>  
> @@ -48,6 +67,56 @@ struct apple_spmi {
>  	readl_poll_timeout((spmi)->regs + (reg), (val), (cond), \
>  			   REG_POLL_INTERVAL_US, REG_POLL_TIMEOUT_US)
>  
> +static void apple_spmi_irq_ack_raw(struct apple_spmi *spmi, u32 irq)
> +{
> +	u32 __iomem *reg = spmi->regs + SPMI_IRQ_ACK_BASE + (irq / 32) * 4;
> +
> +	writel(BIT(irq % 32), reg);
> +}
> +
> +static void apple_spmi_irq_mask_raw(struct apple_spmi *spmi, u32 irq)
> +{
> +	u32 __iomem *reg = spmi->regs + SPMI_IRQ_MASK_BASE + (irq / 32) * 4;
> +
> +	writel(readl(reg) & ~BIT(irq % 32), reg);
> +}
> +
> +static void apple_spmi_irq_unmask_raw(struct apple_spmi *spmi, u32 irq)
> +{
> +	u32 __iomem *reg = spmi->regs + SPMI_IRQ_MASK_BASE + (irq / 32) * 4;
> +
> +	writel(readl(reg) | BIT(irq % 32), reg);
> +}
> +
> +static void apple_spmi_irq_ack(struct irq_data *d)
> +{
> +	struct apple_spmi *spmi = irq_data_get_irq_chip_data(d);
> +
> +	apple_spmi_irq_ack_raw(spmi, d->hwirq);
> +}
> +
> +static void apple_spmi_irq_mask(struct irq_data *d)
> +{
> +	struct apple_spmi *spmi = irq_data_get_irq_chip_data(d);
> +	unsigned long flags;
> +
> +	raw_spin_lock_irqsave(&spmi->irq_mask_lock, flags);
> +	apple_spmi_irq_mask_raw(spmi, d->hwirq);
> +	clear_bit(d->hwirq, spmi->irq_mask_cache);
> +	raw_spin_unlock_irqrestore(&spmi->irq_mask_lock, flags);
> +}
> +
> +static void apple_spmi_irq_unmask(struct irq_data *d)
> +{
> +	struct apple_spmi *spmi = irq_data_get_irq_chip_data(d);
> +	unsigned long flags;
> +
> +	raw_spin_lock_irqsave(&spmi->irq_mask_lock, flags);
> +	set_bit(d->hwirq, spmi->irq_mask_cache);
> +	apple_spmi_irq_unmask_raw(spmi, d->hwirq);
> +	raw_spin_unlock_irqrestore(&spmi->irq_mask_lock, flags);
> +}
> +
>  static inline u32 apple_spmi_pack_cmd(u8 opc, u8 sid, u16 param)
>  {
>  	return opc | sid << 8 | (u32)param << 16 | (1 << 15);
> @@ -60,7 +129,19 @@ static int apple_spmi_wait_rx_not_empty(struct spmi_controller *ctrl)
>  	int ret;
>  	u32 status;
>  
> -	ret = poll_reg(spmi, SPMI_STATUS_REG, status, !(status & SPMI_RX_FIFO_EMPTY));
> +	if (spmi->notify_irq) {
> +		ret = wait_for_completion_timeout(&spmi->fifo_rx,
> +			usecs_to_jiffies(REG_POLL_TIMEOUT_US));
> +		if (!ret)
> +			ret = -ETIMEDOUT;
> +		else if (readl(spmi->regs + SPMI_STATUS_REG) & SPMI_RX_FIFO_EMPTY)
> +			ret = -EIO;
> +		else
> +			ret = 0;
> +	} else {
> +		ret = poll_reg(spmi, SPMI_STATUS_REG, status, !(status & SPMI_RX_FIFO_EMPTY));
> +	}
> +
>  	if (ret) {
>  		spmi->prev_fail = true;
>  		dev_err(&ctrl->dev,
> @@ -85,8 +166,10 @@ static int spmi_raw_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
>  
>  	if (spmi->prev_fail) {
>  		writel(SPMI_ACT_FIFO_FLUSH, spmi->regs + SPMI_RSP_REG);
> +		apple_spmi_irq_ack_raw(spmi, SPMI_IRQ_NOTIFY);
>  		spmi->prev_fail = false;
>  	}
> +	reinit_completion(&spmi->fifo_rx);
>  
>  	writel(spmi_cmd, spmi->regs + SPMI_CMD_REG);
>  
> @@ -188,6 +271,164 @@ static int spmi_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid)
>  	return -EINVAL;
>  }
>  
> +static int apple_spmi_irq_set_type(struct irq_data *d, unsigned int type)
> +{
> +	/* all interrupts have MSI semantics */
> +	return type == IRQ_TYPE_EDGE_RISING ? 0 : -EINVAL;
> +}
> +
> +static struct irq_chip apple_spmi_irq_chip = {
> +	.name = "apple_spmi",
> +	.irq_mask = apple_spmi_irq_mask,
> +	.irq_unmask = apple_spmi_irq_unmask,
> +	.irq_ack = apple_spmi_irq_ack,
> +	.irq_set_type = apple_spmi_irq_set_type,
> +	.flags = IRQCHIP_ONESHOT_SAFE,
> +};
> +
> +static int apple_spmi_irq_domain_map(struct irq_domain *irqd,
> +					unsigned int irq, irq_hw_number_t hw)
> +{
> +	irq_domain_set_info(irqd, irq, hw, &apple_spmi_irq_chip, irqd->host_data,
> +				handle_edge_irq, NULL, NULL);
> +	return 0;
> +}
> +
> +static int apple_spmi_irq_domain_translate(struct irq_domain *irqd,
> +					struct irq_fwspec *fwspec,
> +					unsigned long *hwirq,
> +					unsigned int *type)
> +{
> +	u32 *args = fwspec->param;
> +
> +	if (fwspec->param_count != 2)
> +		return -EINVAL;
> +
> +	if (args[0] >= SPMI_NUM_PERIPHERAL_IRQS)
> +		return -EINVAL;
> +	*hwirq = args[0];
> +	*type = args[1] & IRQ_TYPE_SENSE_MASK;
> +	return 0;
> +}
> +
> +static int apple_spmi_irq_domain_alloc(struct irq_domain *irqd, unsigned int virq,
> +				unsigned int nr_irqs, void *arg)
> +{
> +	unsigned int type = IRQ_TYPE_NONE;
> +	struct irq_fwspec *fwspec = arg;
> +	irq_hw_number_t hwirq;
> +	int i, ret;
> +
> +	ret = apple_spmi_irq_domain_translate(irqd, fwspec, &hwirq, &type);
> +	if (ret)
> +		return ret;
> +
> +	if (hwirq + nr_irqs > SPMI_NUM_PERIPHERAL_IRQS)
> +		return -EINVAL;
> +
> +	for (i = 0; i < nr_irqs; i++) {
> +		ret = apple_spmi_irq_domain_map(irqd, virq + i, hwirq + i);
> +		if (ret)
> +			return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static void apple_spmi_irq_domain_free(struct irq_domain *irqd, unsigned int virq,
> +				unsigned int nr_irqs)
> +{
> +	int i;
> +
> +	for (i = 0; i < nr_irqs; i++) {
> +		struct irq_data *d = irq_domain_get_irq_data(irqd, virq + i);
> +
> +		irq_set_handler(virq + i, NULL);
> +		irq_domain_reset_irq_data(d);
> +	}
> +}
> +
> +static const struct irq_domain_ops apple_spmi_irq_domain_ops = {
> +	.translate	= apple_spmi_irq_domain_translate,
> +	.alloc		= apple_spmi_irq_domain_alloc,
> +	.free		= apple_spmi_irq_domain_free,
> +};
> +
> +static void apple_spmi_irq_handler(struct irq_desc *desc)
> +{
> +	struct apple_spmi *spmi = irq_desc_get_handler_data(desc);
> +	struct irq_chip *chip = irq_desc_get_chip(desc);
> +	bool handled = false;
> +	unsigned long val, offset, bit;
> +
> +	chained_irq_enter(chip, desc);
> +	val = readl(spmi->regs + SPMI_IRQ_ACK_BASE + (SPMI_IRQ_NOTIFY / 32) * 4);
> +	if (val & BIT(SPMI_IRQ_NOTIFY % 32)) {
> +		apple_spmi_irq_ack_raw(spmi, SPMI_IRQ_NOTIFY);
> +		complete(&spmi->fifo_rx);
> +		handled = true;
> +	}
> +
> +	for (offset = 0; offset < SPMI_NUM_PERIPHERAL_IRQS / 8; offset += sizeof(val)) {
> +		val = readq(spmi->regs + SPMI_IRQ_ACK_BASE + offset);
> +		/**
> +		 * because of other masters in the bus, we're going to get a multitude of
> +		 * interrupts we're not interested in. irq_resolve_mapping isn't very
> +		 * optimized for the nonexistent path, so instead we mask with (a locally
> +		 * cached version of) the IRQ mask
> +		 */
> +		val &= spmi->irq_mask_cache[offset / sizeof(val)];
> +		for_each_set_bit(bit, &val, 64) {
> +			generic_handle_domain_irq(spmi->irqd, offset * 8 + bit);
> +			handled = true;
> +			val &= ~BIT(bit);

this is no longer necessary

> +		}
> +	}
> +	if (!handled)
> +		handle_bad_irq(desc);
> +	chained_irq_exit(chip, desc);
> +}
> +
> +static void remove_chained_handler(void *data)
> +{
> +	unsigned int irq = (unsigned int)(uintptr_t)data;
> +
> +	irq_set_chained_handler_and_data(irq, NULL, NULL);
> +}
> +
> +static int apple_spmi_init_irq(struct platform_device *pdev,
> +			  struct apple_spmi *spmi, int irq)
> +{
> +	int ret;
> +	struct irq_domain_info info = {
> +		.fwnode		= pdev->dev.fwnode,
> +		.hwirq_max	= ~0U,
> +		.ops		= &apple_spmi_irq_domain_ops,
> +		.host_data	= spmi,
> +	};
> +
> +	raw_spin_lock_init(&spmi->irq_mask_lock);
> +
> +	for (size_t offset = 0; offset < SPMI_NUM_IRQS / 8; offset += 4) {
> +		writel(0, spmi->regs + SPMI_IRQ_MASK_BASE + offset);
> +		writel(U32_MAX, spmi->regs + SPMI_IRQ_ACK_BASE + offset);
> +	}
> +
> +	spmi->irqd = devm_irq_domain_instantiate(&pdev->dev, &info);
> +	if (IS_ERR(spmi->irqd))
> +		return PTR_ERR(spmi->irqd);
> +
> +	spmi->notify_irq = true;
> +	ret = devm_add_action(&pdev->dev, remove_chained_handler, (void *)(uintptr_t)spmi->irq);
> +	if (ret)
> +		return ret;
> +
> +	irq_set_chained_handler_and_data(spmi->irq, apple_spmi_irq_handler, spmi);
> +	apple_spmi_irq_unmask_raw(spmi, SPMI_IRQ_NOTIFY);

logically I'd set spmi->notify_irq only after unmasking it, not that it
matters as the spmi controller isn't registered yet.

> +
> +	return 0;
> +}
> +
>  static int apple_spmi_probe(struct platform_device *pdev)
>  {
>  	struct apple_spmi *spmi;
> @@ -200,6 +441,8 @@ static int apple_spmi_probe(struct platform_device *pdev)
>  
>  	spmi = spmi_controller_get_drvdata(ctrl);
>  	mutex_init(&spmi->fifo_lock);
> +	init_completion(&spmi->fifo_rx);
> +	platform_set_drvdata(pdev, spmi);
>  
>  	spmi->regs = devm_platform_ioremap_resource(pdev, 0);
>  	if (IS_ERR(spmi->regs))
> @@ -211,6 +454,15 @@ static int apple_spmi_probe(struct platform_device *pdev)
>  	ctrl->write_cmd = spmi_write_cmd;
>  	ctrl->cmd = spmi_cmd;
>  
> +	spmi->irq = platform_get_irq_optional(pdev, 0);
> +	if (spmi->irq < 0 && spmi->irq != -ENXIO)
> +		return spmi->irq;
> +	if (spmi->irq >= 0) {
> +		ret = apple_spmi_init_irq(pdev, spmi, spmi->irq);
> +		if (ret)
> +			return ret;
> +	}
> +
>  	ret = devm_spmi_controller_add(&pdev->dev, ctrl);
>  	if (ret)
>  		return dev_err_probe(&pdev->dev, ret,

Reviewed-by: Janne Grunau <j@jannau.net>

thanks, this looks better than the initial version.

Janne