Adds support for 25MHz clock frequency. Support for this frequency
is added in C0.

Signed-off-by: Thangaraj Samynathan <thangaraj.s@microchip.com>
---
 drivers/spi/spi-pci1xxxx.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/spi/spi-pci1xxxx.c b/drivers/spi/spi-pci1xxxx.c
index 330078b1d50f..e9153570e9e9 100644
--- a/drivers/spi/spi-pci1xxxx.c
+++ b/drivers/spi/spi-pci1xxxx.c
@@ -23,6 +23,7 @@
 #define	SYS_FREQ_DEFAULT		(62500000)
 
 #define	PCI1XXXX_SPI_MAX_CLOCK_HZ	(30000000)
+#define	PCI1XXXX_SPI_CLK_25MHZ		(25000000)
 #define	PCI1XXXX_SPI_CLK_20MHZ		(20000000)
 #define	PCI1XXXX_SPI_CLK_15MHZ		(15000000)
 #define	PCI1XXXX_SPI_CLK_12MHZ		(12000000)
@@ -318,12 +319,14 @@ static void pci1xxxx_spi_set_cs(struct spi_device *spi, bool enable)
 	writel(regval, par->reg_base + SPI_MST_CTL_REG_OFFSET(p->hw_inst));
 }
 
-static u8 pci1xxxx_get_clock_div(u32 hz)
+static u8 pci1xxxx_get_clock_div(struct pci1xxxx_spi *par, u32 hz)
 {
 	u8 val = 0;
 
 	if (hz >= PCI1XXXX_SPI_MAX_CLOCK_HZ)
 		val = 2;
+	else if (par->dev_rev >= 0xC0 && hz >= PCI1XXXX_SPI_CLK_25MHZ)
+		val = 1;
 	else if ((hz < PCI1XXXX_SPI_MAX_CLOCK_HZ) && (hz >= PCI1XXXX_SPI_CLK_20MHZ))
 		val = 3;
 	else if ((hz < PCI1XXXX_SPI_CLK_20MHZ) && (hz >= PCI1XXXX_SPI_CLK_15MHZ))
@@ -423,7 +426,7 @@ static int pci1xxxx_spi_transfer_with_io(struct spi_controller *spi_ctlr,
 
 	p->spi_xfer_in_progress = true;
 	p->bytes_recvd = 0;
-	clkdiv = pci1xxxx_get_clock_div(xfer->speed_hz);
+	clkdiv = pci1xxxx_get_clock_div(par, xfer->speed_hz);
 	tx_buf = xfer->tx_buf;
 	rx_buf = xfer->rx_buf;
 	transfer_len = xfer->len;
@@ -492,7 +495,7 @@ static int pci1xxxx_spi_transfer_with_dma(struct spi_controller *spi_ctlr,
 	}
 	p->xfer = xfer;
 	p->mode = spi->mode;
-	p->clkdiv = pci1xxxx_get_clock_div(xfer->speed_hz);
+	p->clkdiv = pci1xxxx_get_clock_div(par, xfer->speed_hz);
 	p->bytes_recvd = 0;
 	p->rx_buf = xfer->rx_buf;
 	regval = readl(par->reg_base + SPI_MST_EVENT_REG_OFFSET(p->hw_inst));
-- 
2.25.1

On Mon, 26 May 2025 16:19:08 +0530, Thangaraj Samynathan wrote:
> Adds support for 25MHz clock frequency. Support for this frequency
> is added in C0.
> 
> 

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git for-next

Thanks!

[1/1] spi: spi-pci1xxxx: Add support for 25MHz Clock frequency in C0
      commit: c459262159f39e6e6336797feb975799344b749b

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark