Convert function-like macro comments to kernel-doc notation and fix other kernel-doc warnings:

drivers/video/backlight/ili922x.c:85: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst * START_BYTE(id, rs, rw) drivers/video/backlight/ili922x.c:118: warning: expecting prototype for CHECK_FREQ_REG(spi_device s, spi_transfer x)(). Prototype was for CHECK_FREQ_REG() instead

ili922x.c:92: warning: contents before sections ili922x.c:150: warning: No description found for return value of 'ili922x_read_status' ili922x.c:193: warning: No description found for return value of 'ili922x_read' ili922x.c:247: warning: No description found for return value of 'ili922x_write' ili922x.c:353: warning: No description found for return value of 'ili922x_poweron' ili922x.c:382: warning: No description found for return value of 'ili922x_poweroff'

Fixes: 4cfbfa971478 ("video: backlight: add ili922x lcd driver") Signed-off-by: Randy Dunlap rdunlap@infradead.org Reported-by: kernel test robot lkp@intel.com Cc: Lee Jones lee.jones@linaro.org Cc: Daniel Thompson daniel.thompson@linaro.org Cc: Jingoo Han jingoohan1@gmail.com Cc: dri-devel@lists.freedesktop.org Cc: Stefano Babic sbabic@denx.de Cc: Anatolij Gustschin agust@denx.de --- v2: add periods at end of sentences so that the generated documentation flows correctly. (thanks, Daniel)

drivers/video/backlight/ili922x.c | 29 ++++++++++++++++++---------- 1 file changed, 19 insertions(+), 10 deletions(-)

--- linux-next-20211115.orig/drivers/video/backlight/ili922x.c +++ linux-next-20211115/drivers/video/backlight/ili922x.c @@ -82,13 +82,7 @@ #define START_RW_READ 1

/** - * START_BYTE(id, rs, rw) - * - * Set the start byte according to the required operation. - * The start byte is defined as: - * ---------------------------------- - * | 0 | 1 | 1 | 1 | 0 | ID | RS | RW | - * ---------------------------------- + * START_BYTE() - Set the start byte according to the required operation. * @id: display's id as set by the manufacturer * @rs: operation type bit, one of: * - START_RS_INDEX set the index register @@ -96,14 +90,19 @@ * @rw: read/write operation * - START_RW_WRITE write * - START_RW_READ read + * + * The start byte is defined as: + * ---------------------------------- + * | 0 | 1 | 1 | 1 | 0 | ID | RS | RW | + * ---------------------------------- */ #define START_BYTE(id, rs, rw) \ (0x70 | (((id) & 0x01) << 2) | (((rs) & 0x01) << 1) | ((rw) & 0x01))

/** - * CHECK_FREQ_REG(spi_device s, spi_transfer x) - Check the frequency - * for the SPI transfer. According to the datasheet, the controller - * accept higher frequency for the GRAM transfer, but it requires + * CHECK_FREQ_REG() - Check the frequency for the SPI transfer. + * According to the datasheet, the controller + * accepts higher frequency for the GRAM transfer, but it requires * lower frequency when the registers are read/written. * The macro sets the frequency in the spi_transfer structure if * the frequency exceeds the maximum value. @@ -145,6 +144,8 @@ struct ili922x { * ili922x_read_status - read status register from display * @spi: spi device * @rs: output value + * + * Return: %0 on success or a negative error code on failure */ static int ili922x_read_status(struct spi_device *spi, u16 *rs) { @@ -188,6 +189,8 @@ static int ili922x_read_status(struct sp * @spi: spi device * @reg: offset of the register to be read * @rx: output value + * + * Return: %0 on success or a negative error code on failure */ static int ili922x_read(struct spi_device *spi, u8 reg, u16 *rx) { @@ -242,6 +245,8 @@ static int ili922x_read(struct spi_devic * @spi: struct spi_device * * @reg: offset of the register to be written * @value: value to be written + * + * Return: %0 on success or a negative error code on failure */ static int ili922x_write(struct spi_device *spi, u8 reg, u16 value) { @@ -348,6 +353,8 @@ static void set_write_to_gram_reg(struct * The sequence to turn on the display is taken from * the datasheet and/or the example code provided by the * manufacturer. + * + * Return: %0 on success or a negative value on failure */ static int ili922x_poweron(struct spi_device *spi) { @@ -377,6 +384,8 @@ static int ili922x_poweron(struct spi_de /** * ili922x_poweroff - turn the display off * @spi: spi device + * + * Return: %0 on success or a negative value on failure */ static int ili922x_poweroff(struct spi_device *spi) {