Messages in this thread | | | Subject | Re: [PATCH v7] serial: support for 16550A serial ports on LP-8x4x | From | Andy Shevchenko <> | Date | Tue, 01 Mar 2016 13:06:41 +0200 |
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On Tue, 2016-03-01 at 00:26 +0300, Sergei Ianovich wrote: > The patch adds support for 3 additional LP-8x4x built-in serial > ports. > > The device can also host up to 8 extension cards with 4 serial ports > on each card for a total of 35 ports. However, I don't have > the hardware to test extension cards, so they are not supported, yet. > > Signed-off-by: Sergei Ianovich <ynvich@gmail.com> > Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Few more comments, mostly about style.
> +static void lp8841_serial_set_termios(struct uart_port *port, > + struct ktermios *termios, struct ktermios *old) > +{ > +#ifdef BOTHER > + unsigned int cbaud; > +#endif > + unsigned int baud; > + unsigned int len;
Since you are writing this to the register at the end maybe - unsigned int -> u8 (write*b* — exactly one byte) - len -> value (it's not only about data length)
> + unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8; > + struct lp8841_serial_data *data = port->private_data; > + > + /* We only support CS7 and CS8 */ > + while ((termios->c_cflag & CSIZE) != CS7 && > + (termios->c_cflag & CSIZE) != CS8) { > + termios->c_cflag &= ~CSIZE; > + termios->c_cflag |= old_csize; > + old_csize = CS8; > + } > + > + serial8250_do_set_termios(port, termios, old); > + > + if ((termios->c_cflag & CSIZE) == CS7) > + len = 9; > + else > + len = 10; > + > + if (termios->c_cflag & CSTOPB) > + len++;
> + if (termios->c_cflag & PARENB) > + len++; > + if (!(termios->c_cflag & PARODD)) > + len++; > +#ifdef CMSPAR > + if (termios->c_cflag & CMSPAR) > + len++; > +#endif
I don't know if someone likes it or not (up to you), but for me looks better to have ternary operators here:
value += (termios->c_cflag & CSTOPB) ? 1 : 0; value += (termios->c_cflag & PARENB) ? 1 : 0; value += (termios->c_cflag & PARODD) ? 0 : 1;
#ifdef CMSPAR value += (termios->c_cflag & CMSPAR) ? 1 : 0; #endif
> + len -= 9;
This one could be part of previous evaluation: value = (termios->c_cflag & CSIZE) == CS7 ? 0 : 1;
> + len &= 3; > + len <<= 3;
Perhaps to define magic number (e.g. LP8841_DATA_LEN_SHIFT).
> + > + baud = tty_termios_baud_rate(termios); > + > +#ifdef BOTHER > + /* We only support fixed rates */ > + cbaud = termios->c_cflag & CBAUD; > + > + if (cbaud == BOTHER) { > + termios->c_cflag &= ~BOTHER; > + > + /* Don't rewrite B0 */ > + if (baud) { > + tty_termios_encode_baud_rate(termios, baud, > baud); > + baud = tty_termios_baud_rate(termios); > + > + /* Set sane default speed if we get 0 */ > + if (!baud) { > + baud = 9600;
> + tty_termios_encode_baud_rate(termios > , > + baud, baud);
I think you can call this unconditionally together with case > 115200.
> + } > + } > + } > +#endif > + > + /* We only support up to 115200 */ > + if (baud > 115200) { > + baud = 115200; > + tty_termios_encode_baud_rate(termios, baud, baud); > + }
Btw, can we use uart_get_baud_rate() here?
> + writeb(len, data->ios_mem); > + > +}
> +static int lp8841_serial_probe(struct platform_device *pdev) > +{ > + struct uart_8250_port uart = {};
{0}
> + struct lp8841_serial_data *data; > + struct resource *mmres, *mires; > + int ret; > + > + mmres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + mires = platform_get_resource(pdev, IORESOURCE_MEM, 1);
Perhaps move it down to be closer to devm_ioremap_resource() call.
> + if (!mmres) > + return -ENODEV; > + > + data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); > + if (!data) > + return -ENOMEM; > +
+ mires = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> + data->ios_mem = devm_ioremap_resource(&pdev->dev, mires); > + if (IS_ERR(data->ios_mem)) > + return PTR_ERR(data->ios_mem);
-- Andy Shevchenko <andriy.shevchenko@linux.intel.com> Intel Finland Oy
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