Re: [PATCH 2/3] spi: sophgo: add Sophgo SPI NOR controller driver

Yixun Lan
2025-02-24T13:21:26Z

Hi Longbin:

On 18:12 Mon 24 Feb , Longbin Li wrote:
> Add support for Sophgo SPI NOR controller in Sophgo SoC.
>
> Signed-off-by: Longbin Li <looong.bin@gmail.com>
> ---
> drivers/spi/Kconfig | 9 +
> drivers/spi/Makefile | 1 +
> drivers/spi/spi-sophgo-nor.c | 501 +++++++++++++++++++++++++++++++++++
> 3 files changed, 511 insertions(+)
> create mode 100644 drivers/spi/spi-sophgo-nor.c
>
> diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
> index ea8a31032927..6b6d7b348485 100644
> --- a/drivers/spi/Kconfig
> +++ b/drivers/spi/Kconfig
> @@ -1021,6 +1021,15 @@ config SPI_SN_F_OSPI
> for connecting an SPI Flash memory over up to 8-bit wide bus.
> It supports indirect access mode only.
>
> +config SPI_SOPHGO_NOR
> + tristate "Sophgo SPI NOR Controller"
> + depends on ARCH_SOPHGO || COMPILE_TEST
> + help
> + This enables support for the Sophgo SPI NOR controller,
> + which supports Dual/Qual read and write operations while
> + also supporting 3Byte address devices and 4Byte address
> + devices.
> +
> config SPI_SPRD
> tristate "Spreadtrum SPI controller"
> depends on ARCH_SPRD || COMPILE_TEST
> diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
> index 9db7554c1864..9ded1de4b2fd 100644
> --- a/drivers/spi/Makefile
> +++ b/drivers/spi/Makefile
> @@ -134,6 +134,7 @@ obj-$(CONFIG_SPI_SH_SCI) += spi-sh-sci.o
> obj-$(CONFIG_SPI_SIFIVE) += spi-sifive.o
> obj-$(CONFIG_SPI_SLAVE_MT27XX) += spi-slave-mt27xx.o
> obj-$(CONFIG_SPI_SN_F_OSPI) += spi-sn-f-ospi.o
> +obj-$(CONFIG_SPI_SOPHGO_NOR) += spi-sophgo-nor.o
> obj-$(CONFIG_SPI_SPRD) += spi-sprd.o
> obj-$(CONFIG_SPI_SPRD_ADI) += spi-sprd-adi.o
> obj-$(CONFIG_SPI_STM32) += spi-stm32.o
> diff --git a/drivers/spi/spi-sophgo-nor.c b/drivers/spi/spi-sophgo-nor.c
> new file mode 100644
> index 000000000000..1139deeac327
> --- /dev/null
> +++ b/drivers/spi/spi-sophgo-nor.c
> @@ -0,0 +1,501 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Sophgo SPI NOR controller driver
> + *
> + * Copyright (c) 2025 Longbin Li <looong.bin@gmail.com>
> + */
> +
> +#include <linux/bitfield.h>
> +#include <linux/clk.h>
> +#include <linux/iopoll.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/platform_device.h>
> +#include <linux/spi/spi-mem.h>
> +
> +/* Hardware register definitions */
> +#define SPIFMC_CTRL 0x00
> +#define SPIFMC_CTRL_CPHA BIT(12)
> +#define SPIFMC_CTRL_CPOL BIT(13)
> +#define SPIFMC_CTRL_HOLD_OL BIT(14)
> +#define SPIFMC_CTRL_WP_OL BIT(15)
> +#define SPIFMC_CTRL_LSBF BIT(20)
> +#define SPIFMC_CTRL_SRST BIT(21)
> +#define SPIFMC_CTRL_SCK_DIV_SHIFT 0
> +#define SPIFMC_CTRL_FRAME_LEN_SHIFT 16
> +#define SPIFMC_CTRL_SCK_DIV_MASK 0x7FF
> +
> +#define SPIFMC_CE_CTRL 0x04
> +#define SPIFMC_CE_CTRL_CEMANUAL BIT(0)
> +#define SPIFMC_CE_CTRL_CEMANUAL_EN BIT(1)
> +
> +#define SPIFMC_DLY_CTRL 0x08
> +#define SPIFMC_CTRL_FM_INTVL_MASK 0x000f
> +#define SPIFMC_CTRL_FM_INTVL BIT(0)
> +#define SPIFMC_CTRL_CET_MASK 0x0f00
> +#define SPIFMC_CTRL_CET BIT(8)
> +
> +#define SPIFMC_DMMR 0x0c
> +
> +#define SPIFMC_TRAN_CSR 0x10
> +#define SPIFMC_TRAN_CSR_TRAN_MODE_MASK GENMASK(1, 0)
> +#define SPIFMC_TRAN_CSR_TRAN_MODE_RX BIT(0)
> +#define SPIFMC_TRAN_CSR_TRAN_MODE_TX BIT(1)
> +#define SPIFMC_TRAN_CSR_FAST_MODE BIT(3)
> +#define SPIFMC_TRAN_CSR_BUS_WIDTH_1_BIT (0x00 << 4)
> +#define SPIFMC_TRAN_CSR_BUS_WIDTH_2_BIT (0x01 << 4)
> +#define SPIFMC_TRAN_CSR_BUS_WIDTH_4_BIT (0x02 << 4)
> +#define SPIFMC_TRAN_CSR_DMA_EN BIT(6)
> +#define SPIFMC_TRAN_CSR_MISO_LEVEL BIT(7)
> +#define SPIFMC_TRAN_CSR_ADDR_BYTES_MASK GENMASK(10, 8)
> +#define SPIFMC_TRAN_CSR_ADDR_BYTES_SHIFT 8
> +#define SPIFMC_TRAN_CSR_WITH_CMD BIT(11)
> +#define SPIFMC_TRAN_CSR_FIFO_TRG_LVL_MASK GENMASK(13, 12)
> +#define SPIFMC_TRAN_CSR_FIFO_TRG_LVL_1_BYTE (0x00 << 12)
> +#define SPIFMC_TRAN_CSR_FIFO_TRG_LVL_2_BYTE (0x01 << 12)
> +#define SPIFMC_TRAN_CSR_FIFO_TRG_LVL_4_BYTE (0x02 << 12)
> +#define SPIFMC_TRAN_CSR_FIFO_TRG_LVL_8_BYTE (0x03 << 12)
> +#define SPIFMC_TRAN_CSR_GO_BUSY BIT(15)
> +#define SPIFMC_TRAN_CSR_ADDR4B_SHIFT 20
> +#define SPIFMC_TRAN_CSR_CMD4B_SHIFT 21
> +
> +#define SPIFMC_TRAN_NUM 0x14
> +#define SPIFMC_FIFO_PORT 0x18
> +#define SPIFMC_FIFO_PT 0x20
> +
> +#define SPIFMC_INT_STS 0x28
> +#define SPIFMC_INT_TRAN_DONE BIT(0)
> +#define SPIFMC_INT_RD_FIFO BIT(2)
> +#define SPIFMC_INT_WR_FIFO BIT(3)
> +#define SPIFMC_INT_RX_FRAME BIT(4)
> +#define SPIFMC_INT_TX_FRAME BIT(5)
> +
> +#define SPIFMC_INT_EN 0x2c
> +#define SPIFMC_INT_TRAN_DONE_EN BIT(0)
> +#define SPIFMC_INT_RD_FIFO_EN BIT(2)
> +#define SPIFMC_INT_WR_FIFO_EN BIT(3)
> +#define SPIFMC_INT_RX_FRAME_EN BIT(4)
> +#define SPIFMC_INT_TX_FRAME_EN BIT(5)
> +
> +#define SPIFMC_OPT 0x030
> +#define SPIFMC_OPT_DISABLE_FIFO_FLUSH BIT(1)
> +
> +#define SPIFMC_MAX_FIFO_DEPTH 8
> +
> +#define SPIFMC_MAX_READ_SIZE 0x10000
> +
> +struct sophgo_spifmc {
> + struct spi_controller *ctrl;
> + void __iomem *io_base;
> + struct device *dev;
> + struct mutex lock;
it will be great to document the lock
> + struct clk *clk;
> +};
> +
> +static int sophgo_spifmc_wait_int(struct sophgo_spifmc *spifmc, u8 int_type)
> +{
> + u32 stat;
> +
> + return readl_poll_timeout(spifmc->io_base + SPIFMC_INT_STS, stat,
> + (stat & int_type), 0, 1000000);
> +}
> +
> +static int sophgo_spifmc_wait_xfer_size(struct sophgo_spifmc *spifmc,
> + int xfer_size)
> +{
> + u8 stat;
> +
> + return readl_poll_timeout(spifmc->io_base + SPIFMC_FIFO_PT, stat,
> + ((stat & 0xf) == xfer_size), 1, 1000000);
> +}
> +
> +static u32 sophgo_spifmc_init_reg(struct sophgo_spifmc *spifmc)
> +{
> + u32 reg;
> +
> + reg = readl(spifmc->io_base + SPIFMC_TRAN_CSR);
> + reg &= ~(SPIFMC_TRAN_CSR_TRAN_MODE_MASK |
> + SPIFMC_TRAN_CSR_FAST_MODE |
> + SPIFMC_TRAN_CSR_BUS_WIDTH_2_BIT |
> + SPIFMC_TRAN_CSR_BUS_WIDTH_4_BIT |
> + SPIFMC_TRAN_CSR_DMA_EN |
> + SPIFMC_TRAN_CSR_ADDR_BYTES_MASK |
> + SPIFMC_TRAN_CSR_WITH_CMD |
> + SPIFMC_TRAN_CSR_FIFO_TRG_LVL_MASK);
> +
> + writel(reg, spifmc->io_base + SPIFMC_TRAN_CSR);
> +
> + return reg;
> +}
> +
> +static ssize_t sophgo_spifmc_read_64k(struct sophgo_spifmc *spifmc,
> + const struct spi_mem_op *op, loff_t from,
> + size_t len, u_char *buf)
> +{
> + int xfer_size, offset;
> + u32 reg;
> + int ret;
> + int i;
> +
> + reg = sophgo_spifmc_init_reg(spifmc);
> + reg |= (op->addr.nbytes + op->dummy.nbytes) << SPIFMC_TRAN_CSR_ADDR_BYTES_SHIFT;
> + reg |= SPIFMC_TRAN_CSR_FIFO_TRG_LVL_8_BYTE;
> + reg |= SPIFMC_TRAN_CSR_WITH_CMD;
> + reg |= SPIFMC_TRAN_CSR_TRAN_MODE_RX;
> +
> + writel(0, spifmc->io_base + SPIFMC_FIFO_PT);
> + writeb(op->cmd.opcode, spifmc->io_base + SPIFMC_FIFO_PORT);
> +
> + for (i = op->addr.nbytes - 1; i >= 0; i--)
> + writeb((from >> i * 8) & 0xff, spifmc->io_base + SPIFMC_FIFO_PORT);
> +
> + for (i = 0; i < op->dummy.nbytes; i++)
> + writeb(0xff, spifmc->io_base + SPIFMC_FIFO_PORT);
> +
> + writel(len, spifmc->io_base + SPIFMC_TRAN_NUM);
> + writel(0, spifmc->io_base + SPIFMC_INT_STS);
> + reg |= SPIFMC_TRAN_CSR_GO_BUSY;
> + writel(reg, spifmc->io_base + SPIFMC_TRAN_CSR);
> +
> + ret = sophgo_spifmc_wait_int(spifmc, SPIFMC_INT_RD_FIFO);
> + if (ret < 0)
> + return ret;
> +
> + offset = 0;
> + while (offset < len) {
> + xfer_size = min_t(size_t, SPIFMC_MAX_FIFO_DEPTH, len - offset);
> +
> + ret = sophgo_spifmc_wait_xfer_size(spifmc, xfer_size);
> + if (ret < 0)
> + return ret;
> +
> + for (i = 0; i < xfer_size; i++)
> + buf[i + offset] = readb(spifmc->io_base + SPIFMC_FIFO_PORT);
> +
> + offset += xfer_size;
> + }
> +
> + ret = sophgo_spifmc_wait_int(spifmc, SPIFMC_INT_TRAN_DONE);
> + if (ret < 0)
> + return ret;
> +
> + writel(0, spifmc->io_base + SPIFMC_FIFO_PT);
> +
> + return len;
> +}
> +
> +static ssize_t sophgo_spifmc_read(struct sophgo_spifmc *spifmc,
> + const struct spi_mem_op *op)
> +{
> + size_t xfer_size;
> + size_t offset;
> + loff_t from = op->addr.val;
> + size_t len = op->data.nbytes;
> + int ret;
> + u8 *din = op->data.buf.in;
> +
> + offset = 0;
> + while (offset < len) {
> + xfer_size = min_t(size_t, SPIFMC_MAX_READ_SIZE, len - offset);
> +
> + ret = sophgo_spifmc_read_64k(spifmc, op, from, xfer_size, din);
> + if (ret < 0)
> + return ret;
> +
> + offset += xfer_size;
> + din += xfer_size;
> + from += xfer_size;
> + }
> +
> + return 0;
> +}
> +
> +static ssize_t sophgo_spifmc_write(struct sophgo_spifmc *spifmc,
> + const struct spi_mem_op *op)
> +{
> + size_t xfer_size;
> + const u8 *dout = op->data.buf.out;
> + int i, offset;
> + size_t ret;
> + u32 reg;
> +
> + reg = sophgo_spifmc_init_reg(spifmc);
> + reg |= (op->addr.nbytes + op->dummy.nbytes) << SPIFMC_TRAN_CSR_ADDR_BYTES_SHIFT;
> + reg |= SPIFMC_TRAN_CSR_FIFO_TRG_LVL_8_BYTE;
> + reg |= SPIFMC_TRAN_CSR_WITH_CMD;
> + reg |= SPIFMC_TRAN_CSR_TRAN_MODE_TX;
> +
> + writel(0, spifmc->io_base + SPIFMC_FIFO_PT);
> + writeb(op->cmd.opcode, spifmc->io_base + SPIFMC_FIFO_PORT);
> +
> + for (i = op->addr.nbytes - 1; i >= 0; i--)
> + writeb((op->addr.val >> i * 8) & 0xff, spifmc->io_base + SPIFMC_FIFO_PORT);
> +
> + for (i = 0; i < op->dummy.nbytes; i++)
> + writeb(0xff, spifmc->io_base + SPIFMC_FIFO_PORT);
> +
> + writel(0, spifmc->io_base + SPIFMC_INT_STS);
> + writel(op->data.nbytes, spifmc->io_base + SPIFMC_TRAN_NUM);
> + reg |= SPIFMC_TRAN_CSR_GO_BUSY;
> + writel(reg, spifmc->io_base + SPIFMC_TRAN_CSR);
> +
> + ret = sophgo_spifmc_wait_xfer_size(spifmc, 0);
> + if (ret < 0)
> + return ret;
> +
> + writel(0, spifmc->io_base + SPIFMC_FIFO_PT);
> +
> + offset = 0;
> + while (offset < op->data.nbytes) {
> + xfer_size = min_t(size_t, SPIFMC_MAX_FIFO_DEPTH, op->data.nbytes - offset);
> +
> + ret = sophgo_spifmc_wait_xfer_size(spifmc, 0);
> + if (ret < 0)
> + return ret;
> +
> + for (i = 0; i < xfer_size; i++)
> + writeb(dout[i + offset], spifmc->io_base + SPIFMC_FIFO_PORT);
> +
> + offset += xfer_size;
> + }
> +
> + ret = sophgo_spifmc_wait_int(spifmc, SPIFMC_INT_TRAN_DONE);
> + if (ret < 0)
> + return ret;
> +
> + writel(0, spifmc->io_base + SPIFMC_FIFO_PT);
> +
> + return 0;
> +}
> +
> +static ssize_t sophgo_spifmc_tran_cmd(struct sophgo_spifmc *spifmc,
> + const struct spi_mem_op *op)
> +{
> + int i, ret;
> + u32 reg;
> +
> + reg = sophgo_spifmc_init_reg(spifmc);
> + reg |= (op->addr.nbytes + op->dummy.nbytes) << SPIFMC_TRAN_CSR_ADDR_BYTES_SHIFT;
> + reg |= SPIFMC_TRAN_CSR_FIFO_TRG_LVL_1_BYTE;
> + reg |= SPIFMC_TRAN_CSR_WITH_CMD;
> +
> + writel(0, spifmc->io_base + SPIFMC_FIFO_PT);
> + writeb(op->cmd.opcode, spifmc->io_base + SPIFMC_FIFO_PORT);
> +
> + for (i = op->addr.nbytes - 1; i >= 0; i--)
> + writeb((op->addr.val >> i * 8) & 0xff, spifmc->io_base + SPIFMC_FIFO_PORT);
> +
> + for (i = 0; i < op->dummy.nbytes; i++)
> + writeb(0xff, spifmc->io_base + SPIFMC_FIFO_PORT);
> +
> + writel(0, spifmc->io_base + SPIFMC_INT_STS);
> + reg |= SPIFMC_TRAN_CSR_GO_BUSY;
> + writel(reg, spifmc->io_base + SPIFMC_TRAN_CSR);
> +
> + ret = sophgo_spifmc_wait_int(spifmc, SPIFMC_INT_TRAN_DONE);
> + if (ret < 0)
> + return ret;
> +
> + writel(0, spifmc->io_base + SPIFMC_FIFO_PT);
> +
> + return 0;
> +}
> +
> +static void sophgo_spifmc_trans(struct sophgo_spifmc *spifmc,
> + const struct spi_mem_op *op)
> +{
> + if (op->data.dir == SPI_MEM_DATA_IN)
> + sophgo_spifmc_read(spifmc, op);
> + else if (op->data.dir == SPI_MEM_DATA_OUT)
> + sophgo_spifmc_write(spifmc, op);
> + else
> + sophgo_spifmc_tran_cmd(spifmc, op);
> +}
> +
> +static ssize_t sophgo_spifmc_trans_reg(struct sophgo_spifmc *spifmc,
> + const struct spi_mem_op *op)
> +{
> + const u8 *dout = NULL;
> + u8 *din = NULL;
> + size_t len = op->data.nbytes;
> + u32 reg;
> + int ret;
> + int i;
squash them which save one line:
int i, ret;

> +
> + if (op->data.dir == SPI_MEM_DATA_IN)
> + din = op->data.buf.in;
> + else
> + dout = op->data.buf.out;
> +
> + reg = sophgo_spifmc_init_reg(spifmc);
> + reg |= SPIFMC_TRAN_CSR_FIFO_TRG_LVL_1_BYTE;
> + reg |= SPIFMC_TRAN_CSR_WITH_CMD;
> +
> + if (din) {
> + reg |= SPIFMC_TRAN_CSR_BUS_WIDTH_1_BIT;
> + reg |= SPIFMC_TRAN_CSR_TRAN_MODE_RX;
> + reg |= SPIFMC_TRAN_CSR_TRAN_MODE_TX;
> +
> + writel(SPIFMC_OPT_DISABLE_FIFO_FLUSH, spifmc->io_base + SPIFMC_OPT);
> + } else {
> + /*
> + * If write values to the Status Register,
> + * configure TRAN_CSR register as the same as
> + * sophgo_spifmc_read_reg.
> + */
> + if (op->cmd.opcode == 0x01) {
> + reg |= SPIFMC_TRAN_CSR_TRAN_MODE_RX;
> + reg |= SPIFMC_TRAN_CSR_TRAN_MODE_TX;
> + writel(len, spifmc->io_base + SPIFMC_TRAN_NUM);
> + }
> + }
> +
> + writel(0, spifmc->io_base + SPIFMC_FIFO_PT);
> + writeb(op->cmd.opcode, spifmc->io_base + SPIFMC_FIFO_PORT);
> +
> + for (i = 0; i < len; i++) {
> + if (din)
> + writeb(0xff, spifmc->io_base + SPIFMC_FIFO_PORT);
> + else
> + writeb(dout[i], spifmc->io_base + SPIFMC_FIFO_PORT);
> + }
> +
> + writel(0, spifmc->io_base + SPIFMC_INT_STS);
> + writel(len, spifmc->io_base + SPIFMC_TRAN_NUM);
> + reg |= SPIFMC_TRAN_CSR_GO_BUSY;
> + writel(reg, spifmc->io_base + SPIFMC_TRAN_CSR);
> +
> + ret = sophgo_spifmc_wait_int(spifmc, SPIFMC_INT_TRAN_DONE);
> + if (ret < 0)
> + return ret;
> +
> + if (din) {
> + while (len--)
> + *din++ = readb(spifmc->io_base + SPIFMC_FIFO_PORT);
> + }
> +
> + writel(0, spifmc->io_base + SPIFMC_FIFO_PT);
> +
> + return 0;
> +}
> +
> +static int sophgo_spifmc_exec_op(struct spi_mem *mem,
> + const struct spi_mem_op *op)
> +{
> + struct sophgo_spifmc *spifmc;
> +
> + spifmc = spi_controller_get_devdata(mem->spi->controller);
> +
> + mutex_lock(&spifmc->lock);
> +
> + if (op->addr.nbytes == 0)
> + sophgo_spifmc_trans_reg(spifmc, op);
> + else
> + sophgo_spifmc_trans(spifmc, op);
> +
> + mutex_unlock(&spifmc->lock);
> +
> + return 0;
> +}
> +
> +static const struct spi_controller_mem_ops sophgo_spifmc_mem_ops = {
> + .exec_op = sophgo_spifmc_exec_op,
> +};
> +
> +static void sophgo_spifmc_init(struct sophgo_spifmc *spifmc)
> +{
> + u32 tran_csr;
> + u32 reg;
> +
> + writel(0, spifmc->io_base + SPIFMC_DMMR);
> +
> + reg = readl(spifmc->io_base + SPIFMC_CTRL);
> + reg |= SPIFMC_CTRL_SRST;
..
> + reg &= ~((1 << 11) - 1);
so this is a mask? use macro to define, instead of using magic number
> + reg |= 1;
> + writel(reg, spifmc->io_base + SPIFMC_CTRL);
> +
> + writel(0, spifmc->io_base + SPIFMC_CE_CTRL);
> +
> + tran_csr = readl(spifmc->io_base + SPIFMC_TRAN_CSR);
> + tran_csr |= (0 << SPIFMC_TRAN_CSR_ADDR_BYTES_SHIFT);
> + tran_csr |= SPIFMC_TRAN_CSR_FIFO_TRG_LVL_4_BYTE;
> + tran_csr |= SPIFMC_TRAN_CSR_WITH_CMD;
> + writel(tran_csr, spifmc->io_base + SPIFMC_TRAN_CSR);
> +}
> +
> +static int sophgo_spifmc_probe(struct platform_device *pdev)
> +{
> + struct spi_controller *ctrl;
> + struct sophgo_spifmc *spifmc;
> + void __iomem *base;
> + int ret;
> +
> + ctrl = devm_spi_alloc_host(&pdev->dev, sizeof(*spifmc));
> + if (!ctrl)
> + return -ENOMEM;
> +
> + spifmc = spi_controller_get_devdata(ctrl);
> + dev_set_drvdata(&pdev->dev, ctrl);
> +
..
> + spifmc->clk = devm_clk_get(&pdev->dev, NULL);
> + if (IS_ERR(spifmc->clk)) {
> + dev_err(&pdev->dev, "AHB clock not found.\n");
> + return PTR_ERR(spifmc->clk);
> + }
> +
> + ret = clk_prepare_enable(spifmc->clk);
> + if (ret) {
> + dev_err(&pdev->dev, "Unable to enable AHB clock.\n");
> + return ret;
> + }
you can combine above with devm_clk_get_enabled(), and simplify
return routine by using "return dev_err_probe(..)"

> +
> + spifmc->dev = &pdev->dev;
> + spifmc->ctrl = ctrl;
> +
> + spifmc->io_base = devm_platform_ioremap_resource(pdev, 0);
> + if (IS_ERR(base))
> + return PTR_ERR(base);
> +
> + ctrl->num_chipselect = 1;
> + ctrl->dev.of_node = pdev->dev.of_node;
> + ctrl->bits_per_word_mask = SPI_BPW_MASK(8);
> + ctrl->auto_runtime_pm = false;
> + ctrl->mem_ops = &sophgo_spifmc_mem_ops;
> + ctrl->mode_bits = SPI_RX_DUAL | SPI_TX_DUAL | SPI_RX_QUAD | SPI_TX_QUAD;
> +
> + mutex_init(&spifmc->lock);
strictly, you still need to do error handler, e.g, destroy mutex if probe fail
> +
> + sophgo_spifmc_init(spifmc);
> + sophgo_spifmc_init_reg(spifmc);
> +
> + return devm_spi_register_controller(&pdev->dev, ctrl);
> +}
> +
> +static void sophgo_spifmc_remove(struct platform_device *pdev)
> +{
> + struct sophgo_spifmc *spifmc = platform_get_drvdata(pdev);
> +
> + mutex_destroy(&spifmc->lock);
> +}
> +
> +static const struct of_device_id sophgo_spifmc_match[] = {
> + { .compatible = "sophgo,sg2044-spifmc-nor" },
> + { /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, sophgo_spifmc_match);
> +
> +static struct platform_driver sophgo_nor_driver = {
> + .driver = {
> + .name = "sophgo,spifmc-nor",
> + .of_match_table = sophgo_spifmc_match,
> + },
> + .probe = sophgo_spifmc_probe,
> + .remove = sophgo_spifmc_remove,
> +};
..
> +
spurious blank line here, drop it
> +module_platform_driver(sophgo_nor_driver);
> +
> +MODULE_DESCRIPTION("Sophgo SPI NOR controller driver");
> +MODULE_AUTHOR("Longbin Li <looong.bin@gmail.com>");
> +MODULE_LICENSE("GPL");
> --
> 2.48.1

--
Yixun Lan (dlan)
Gentoo Linux Developer
GPG Key ID AABEFD55