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Message-ID: <CAPLW+4m-2fdBL4N1DmHzg4rrGbdJEOj8LqFA7DYvf4-uc=Gu-g@mail.gmail.com>
Date: Tue, 16 Jan 2024 11:50:02 -0600
From: Sam Protsenko <semen.protsenko@...aro.org>
To: Tudor Ambarus <tudor.ambarus@...aro.org>
Cc: peter.griffin@...aro.org, krzysztof.kozlowski+dt@...aro.org,
gregkh@...uxfoundation.org, mturquette@...libre.com, sboyd@...nel.org,
robh+dt@...nel.org, conor+dt@...nel.org, andi.shyti@...nel.org,
alim.akhtar@...sung.com, jirislaby@...nel.org, s.nawrocki@...sung.com,
tomasz.figa@...il.com, cw00.choi@...sung.com,
linux-arm-kernel@...ts.infradead.org, linux-samsung-soc@...r.kernel.org,
linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org,
linux-serial@...r.kernel.org, andre.draszik@...aro.org,
kernel-team@...roid.com, willmcvicker@...gle.com
Subject: Re: [PATCH v3 04/12] tty: serial: samsung: prepare for different IO types
On Tue, Jan 9, 2024 at 6:59 AM Tudor Ambarus <tudor.ambarus@...aro.org> wrote:
>
> GS101's Connectivity Peripheral blocks (peric0/1 blocks) which
> include the I3C and USI (I2C, SPI, UART) only allow 32-bit
> register accesses. If using 8-bit register accesses, a SError
> Interrupt is raised causing the system unusable.
>
> Instead of specifying the reg-io-width = 4 everywhere, for each node,
> the requirement should be deduced from the compatible.
>
> Prepare the samsung tty driver to allow IO types different than
> UPIO_MEM. ``struct uart_port::iotype`` is an unsigned char where all
> its 8 bits are exposed to uapi. We can't make NULL checks on it to
> verify if it's set, thus always set it from the driver's data.
> Use u8 for the ``iotype`` member of ``struct s3c24xx_uart_info`` to
> emphasize that the iotype is an 8 bit mask.
>
> Signed-off-by: Tudor Ambarus <tudor.ambarus@...aro.org>
> ---
Reviewed-by: Sam Protsenko <semen.protsenko@...aro.org>
> v3:
> - reposition the ``iotype`` member of ``struct s3c24xx_uart_info`` so
> that we reduce the struct's memory footprint.
> - change ``iotype`` to u8 to emphasize that it's a 8 bit mask and update
> the commit message explaining why.
> v2: new patch
>
> drivers/tty/serial/samsung_tty.c | 9 ++++++++-
> 1 file changed, 8 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/tty/serial/samsung_tty.c b/drivers/tty/serial/samsung_tty.c
> index 66bd6c090ace..ff646cddd3f8 100644
> --- a/drivers/tty/serial/samsung_tty.c
> +++ b/drivers/tty/serial/samsung_tty.c
> @@ -84,6 +84,7 @@ struct s3c24xx_uart_info {
> unsigned long clksel_mask;
> unsigned long clksel_shift;
> unsigned long ucon_mask;
> + u8 iotype;
>
> /* uart port features */
>
> @@ -1742,7 +1743,6 @@ static void s3c24xx_serial_init_port_default(int index) {
>
> spin_lock_init(&port->lock);
>
> - port->iotype = UPIO_MEM;
> port->uartclk = 0;
> port->fifosize = 16;
> port->flags = UPF_BOOT_AUTOCONF;
> @@ -1989,6 +1989,8 @@ static int s3c24xx_serial_probe(struct platform_device *pdev)
> break;
> }
>
> + ourport->port.iotype = ourport->info->iotype;
> +
> if (np) {
> of_property_read_u32(np,
> "samsung,uart-fifosize", &ourport->port.fifosize);
> @@ -2401,6 +2403,7 @@ static const struct s3c24xx_serial_drv_data s3c6400_serial_drv_data = {
> .name = "Samsung S3C6400 UART",
> .type = TYPE_S3C6400,
> .port_type = PORT_S3C6400,
> + .iotype = UPIO_MEM,
> .fifosize = 64,
> .has_divslot = 1,
> .rx_fifomask = S3C2440_UFSTAT_RXMASK,
> @@ -2430,6 +2433,7 @@ static const struct s3c24xx_serial_drv_data s5pv210_serial_drv_data = {
> .name = "Samsung S5PV210 UART",
> .type = TYPE_S3C6400,
> .port_type = PORT_S3C6400,
> + .iotype = UPIO_MEM,
> .has_divslot = 1,
> .rx_fifomask = S5PV210_UFSTAT_RXMASK,
> .rx_fifoshift = S5PV210_UFSTAT_RXSHIFT,
> @@ -2459,6 +2463,7 @@ static const struct s3c24xx_serial_drv_data s5pv210_serial_drv_data = {
> .name = "Samsung Exynos UART", \
> .type = TYPE_S3C6400, \
> .port_type = PORT_S3C6400, \
> + .iotype = UPIO_MEM, \
> .has_divslot = 1, \
> .rx_fifomask = S5PV210_UFSTAT_RXMASK, \
> .rx_fifoshift = S5PV210_UFSTAT_RXSHIFT, \
> @@ -2519,6 +2524,7 @@ static const struct s3c24xx_serial_drv_data s5l_serial_drv_data = {
> .name = "Apple S5L UART",
> .type = TYPE_APPLE_S5L,
> .port_type = PORT_8250,
> + .iotype = UPIO_MEM,
> .fifosize = 16,
> .rx_fifomask = S3C2410_UFSTAT_RXMASK,
> .rx_fifoshift = S3C2410_UFSTAT_RXSHIFT,
> @@ -2548,6 +2554,7 @@ static const struct s3c24xx_serial_drv_data artpec8_serial_drv_data = {
> .name = "Axis ARTPEC-8 UART",
> .type = TYPE_S3C6400,
> .port_type = PORT_S3C6400,
> + .iotype = UPIO_MEM,
> .fifosize = 64,
> .has_divslot = 1,
> .rx_fifomask = S5PV210_UFSTAT_RXMASK,
> --
> 2.43.0.472.g3155946c3a-goog
>
>
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