[PATCH v2 0/2] mfd: rsmu: fixes and new IC support

[PATCH v2 0/2] mfd: rsmu: fixes and new IC support

[Matthew Bystrin]

Hi!

First patch fixes Renesas 8A34002 SPI driver.

In my setup 8A34002 is connected to VisionFive2 (via SPI or I2C). I've
discovered that upstream driver does not work:

[    4.728771] 8a3400x-phc 8a3400x-phc.0.auto: 4.8.7, Id: 0x4002  HW Rev: 5  OTP Config Select: 0
[    4.737389] 8a3400x-phc 8a3400x-phc.0.auto: requesting firmware 'idtcm.bin'
[    4.744462] 8a3400x-phc 8a3400x-phc.0.auto: Direct firmware load for idtcm.bin failed with error -2
[    4.753547] 8a3400x-phc 8a3400x-phc.0.auto: Failed at line 1273 in idtcm_load_firmware!
[    4.761576] 8a3400x-phc 8a3400x-phc.0.auto: loading firmware failed with -2
[    4.769411] 8a3400x-phc 8a3400x-phc.0.auto: No wait state: DPLL_SYS_STATE 0
[    4.776374] 8a3400x-phc 8a3400x-phc.0.auto: Continuing while SYS APLL/DPLL is not locked
[    4.785206] 8a3400x-phc 8a3400x-phc.0.auto: Unsupported MANUAL_REFERENCE: 0x00
[    4.796930] 8a3400x-phc 8a3400x-phc.0.auto: PLL2 registered as ptp0

This being caused by a piece of code in rsmu_write_page_register() function:

if (reg < RSMU_CM_SCSR_BASE)
	return 0;

All addresses in include/linux/mfd/idt8a340_reg.h are less than
RSMU_CM_SCSR_BASE so functions was returning early, before any modifications to
the page register. Valid read of versions - is just a coincidence, because
default value of the page register is zero.

There were 2 separate patch series which had to be merged in one time: mfd and
ptp. The latter have been merged, the former [1] have not. As result we've got a
broken driver.

This patch can be reverted later when the second part will be ready (of course
if it is planned to do so). Any comments, Min? I could support with testing.

Second patch just adds support for 8A34002, which is compatible with 8A34001. As
I can see there is no need to update bindings, everything is already being done.

Link [2] to v1.

Changes in v2:
- Fix page register issue in rsmu_i2c
- Add support for 8a34002 in rsmu_i2c

Link [1]: https://lore.kernel.org/netdev/LV3P220MB1202F8E2FCCFBA2519B4966EA0192@LV3P220MB1202.NAMP220.PROD.OUTLOOK.COM/
Link [2]: https://lore.kernel.org/netdev/20260421090710.395591-1-dev.mbstr@gmail.com/
Signed-off-by: Matthew Bystrin <dev.mbstr@gmail.com>

Matthew Bystrin (2):
  mfd: rsmu: fix page register setup
  mfd: rsmu: add 8a34002 support

 drivers/mfd/rsmu_i2c.c | 8 +++-----
 drivers/mfd/rsmu_spi.c | 7 +++----
 2 files changed, 6 insertions(+), 9 deletions(-)

-- 
2.53.0

[PATCH v2 1/2] mfd: rsmu: fix page register setup

[Matthew Bystrin]

Fix writes to page register in 8A3400x family (Clock Matrix).

All calls to rsmu_write_page_register() (both in i2c and spi) have
resulted in early return, becase all addresses in
include/linux/mfd/idt8a340_reg.h are less than RSMU_CM_SCSR_BASE.

There were 2 separate patch series which have to be merged in one time:
mfd and ptp. The latter have been merged, the former[1] have not.

Link: https://lore.kernel.org/netdev/LV3P220MB1202F8E2FCCFBA2519B4966EA0192@LV3P220MB1202.NAMP220.PROD.OUTLOOK.COM/
Fixes: 67d6c76fc815 ("mfd: rsmu: Support 32-bit address space")
Signed-off-by: Matthew Bystrin <dev.mbstr@gmail.com>
---
 drivers/mfd/rsmu_i2c.c | 6 +-----
 drivers/mfd/rsmu_spi.c | 5 +----
 2 files changed, 2 insertions(+), 9 deletions(-)

diff --git a/drivers/mfd/rsmu_i2c.c b/drivers/mfd/rsmu_i2c.c
index cba64f107a2f..9e5fc8259eec 100644
--- a/drivers/mfd/rsmu_i2c.c
+++ b/drivers/mfd/rsmu_i2c.c
@@ -134,14 +134,10 @@ static int rsmu_i2c_write_device(struct rsmu_ddata *rsmu, u8 reg, u8 *buf, u8 by
 static int rsmu_write_page_register(struct rsmu_ddata *rsmu, u32 reg,
 				    rsmu_rw_device rsmu_write_device)
 {
-	u32 page = reg & RSMU_CM_PAGE_MASK;
+	u32 page = (reg | RSMU_CM_SCSR_BASE) & RSMU_CM_PAGE_MASK;
 	u8 buf[4];
 	int err;
 
-	/* Do not modify offset register for none-scsr registers */
-	if (reg < RSMU_CM_SCSR_BASE)
-		return 0;
-
 	/* Simply return if we are on the same page */
 	if (rsmu->page == page)
 		return 0;
diff --git a/drivers/mfd/rsmu_spi.c b/drivers/mfd/rsmu_spi.c
index 39d9be1e141f..c931d8cea0a1 100644
--- a/drivers/mfd/rsmu_spi.c
+++ b/drivers/mfd/rsmu_spi.c
@@ -101,11 +101,8 @@ static int rsmu_write_page_register(struct rsmu_ddata *rsmu, u32 reg)
 
 	switch (rsmu->type) {
 	case RSMU_CM:
-		/* Do not modify page register for none-scsr registers */
-		if (reg < RSMU_CM_SCSR_BASE)
-			return 0;
 		page_reg = RSMU_CM_PAGE_ADDR;
-		page = reg & RSMU_PAGE_MASK;
+		page = (reg | RSMU_CM_SCSR_BASE) & RSMU_PAGE_MASK;
 		buf[0] = (u8)(page & 0xFF);
 		buf[1] = (u8)((page >> 8) & 0xFF);
 		buf[2] = (u8)((page >> 16) & 0xFF);
-- 
2.53.0

[PATCH v2 2/2] mfd: rsmu: add 8a34002 support

[Matthew Bystrin]

Add compatible string, i2c_devcie_id and spi_devcie_id to support
8a34002.

Signed-off-by: Matthew Bystrin <dev.mbstr@gmail.com>
---
 drivers/mfd/rsmu_i2c.c | 2 ++
 drivers/mfd/rsmu_spi.c | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/drivers/mfd/rsmu_i2c.c b/drivers/mfd/rsmu_i2c.c
index 9e5fc8259eec..c57795ed20f4 100644
--- a/drivers/mfd/rsmu_i2c.c
+++ b/drivers/mfd/rsmu_i2c.c
@@ -330,6 +330,7 @@ static void rsmu_i2c_remove(struct i2c_client *client)
 static const struct i2c_device_id rsmu_i2c_id[] = {
 	{ "8a34000",  RSMU_CM },
 	{ "8a34001",  RSMU_CM },
+	{ "8a34002",  RSMU_CM },
 	{ "82p33810", RSMU_SABRE },
 	{ "82p33811", RSMU_SABRE },
 	{ "8v19n850", RSMU_SL },
@@ -341,6 +342,7 @@ MODULE_DEVICE_TABLE(i2c, rsmu_i2c_id);
 static const struct of_device_id rsmu_i2c_of_match[] = {
 	{ .compatible = "idt,8a34000",  .data = (void *)RSMU_CM },
 	{ .compatible = "idt,8a34001",  .data = (void *)RSMU_CM },
+	{ .compatible = "idt,8a34002",  .data = (void *)RSMU_CM },
 	{ .compatible = "idt,82p33810", .data = (void *)RSMU_SABRE },
 	{ .compatible = "idt,82p33811", .data = (void *)RSMU_SABRE },
 	{ .compatible = "idt,8v19n850", .data = (void *)RSMU_SL },
diff --git a/drivers/mfd/rsmu_spi.c b/drivers/mfd/rsmu_spi.c
index c931d8cea0a1..e07f21482439 100644
--- a/drivers/mfd/rsmu_spi.c
+++ b/drivers/mfd/rsmu_spi.c
@@ -241,6 +241,7 @@ static void rsmu_spi_remove(struct spi_device *client)
 static const struct spi_device_id rsmu_spi_id[] = {
 	{ "8a34000",  RSMU_CM },
 	{ "8a34001",  RSMU_CM },
+	{ "8a34002",  RSMU_CM },
 	{ "82p33810", RSMU_SABRE },
 	{ "82p33811", RSMU_SABRE },
 	{}
@@ -250,6 +251,7 @@ MODULE_DEVICE_TABLE(spi, rsmu_spi_id);
 static const struct of_device_id rsmu_spi_of_match[] = {
 	{ .compatible = "idt,8a34000",  .data = (void *)RSMU_CM },
 	{ .compatible = "idt,8a34001",  .data = (void *)RSMU_CM },
+	{ .compatible = "idt,8a34002",  .data = (void *)RSMU_CM },
 	{ .compatible = "idt,82p33810", .data = (void *)RSMU_SABRE },
 	{ .compatible = "idt,82p33811", .data = (void *)RSMU_SABRE },
 	{}
-- 
2.53.0

Re: [PATCH v2 0/2] mfd: rsmu: fixes and new IC support

[Lee Jones]

On Wed, 29 Apr 2026 10:20:45 +0300, Matthew Bystrin wrote:
> First patch fixes Renesas 8A34002 SPI driver.
> 
> In my setup 8A34002 is connected to VisionFive2 (via SPI or I2C). I've
> discovered that upstream driver does not work:
> 
> [    4.728771] 8a3400x-phc 8a3400x-phc.0.auto: 4.8.7, Id: 0x4002  HW Rev: 5  OTP Config Select: 0
> [    4.737389] 8a3400x-phc 8a3400x-phc.0.auto: requesting firmware 'idtcm.bin'
> [    4.744462] 8a3400x-phc 8a3400x-phc.0.auto: Direct firmware load for idtcm.bin failed with error -2
> [    4.753547] 8a3400x-phc 8a3400x-phc.0.auto: Failed at line 1273 in idtcm_load_firmware!
> [    4.761576] 8a3400x-phc 8a3400x-phc.0.auto: loading firmware failed with -2
> [    4.769411] 8a3400x-phc 8a3400x-phc.0.auto: No wait state: DPLL_SYS_STATE 0
> [    4.776374] 8a3400x-phc 8a3400x-phc.0.auto: Continuing while SYS APLL/DPLL is not locked
> [    4.785206] 8a3400x-phc 8a3400x-phc.0.auto: Unsupported MANUAL_REFERENCE: 0x00
> [    4.796930] 8a3400x-phc 8a3400x-phc.0.auto: PLL2 registered as ptp0
> 
> [...]

Applied, thanks!

[1/2] mfd: rsmu: fix page register setup
      commit: d65ff90be2c1a09e9e477e6f7493fae21b31e59c
[2/2] mfd: rsmu: add 8a34002 support
      commit: c8e94555a15fbe0925a9cc424118ca10e3b5531a

--
Lee Jones [李琼斯]