[U-Boot] [PATCH] serial: fdt: add device tree support for pl01x

[vikasm <vikas.manocha@st.com>]

Thanks Simon,

On 05/01/2015 03:02 PM, Simon Glass wrote:
> +Masahiro, for my of_match_ptr() comment below.
>
> Hi Vikas,
>
> On 1 May 2015 at 15:48, Vikas Manocha <vikas.manocha@st.com> wrote:
>> This patch adds device tree support for arm pl010/pl011 driver.
>>
>> Signed-off-by: Vikas Manocha <vikas.manocha@st.com>
>> ---
>>  doc/device-tree-bindings/serial/pl01x.txt |    7 +++++
>>  drivers/serial/serial_pl01x.c             |   41 ++++++++++++++++++++++++++++-
>>  2 files changed, 47 insertions(+), 1 deletion(-)
>>  create mode 100644 doc/device-tree-bindings/serial/pl01x.txt
>>
>> diff --git a/doc/device-tree-bindings/serial/pl01x.txt b/doc/device-tree-bindings/serial/pl01x.txt
>> new file mode 100644
>> index 0000000..61c27d1
>> --- /dev/null
>> +++ b/doc/device-tree-bindings/serial/pl01x.txt
>> @@ -0,0 +1,7 @@
>> +* ARM AMBA Primecell PL011 & PL010 serial UART
>> +
>> +Required properties:
>> +- compatible: must be "arm,primecell", "arm,pl011" or "arm,pl010"
>> +- reg: exactly one register range with length 0x1000
>> +- clock: input clock frequency for the UART (used to calculate the baud
>> +  rate divisor)
>> diff --git a/drivers/serial/serial_pl01x.c b/drivers/serial/serial_pl01x.c
>> index 2124161..ea22cfd 100644
>> --- a/drivers/serial/serial_pl01x.c
>> +++ b/drivers/serial/serial_pl01x.c
>> @@ -20,6 +20,9 @@
>>  #include <dm/platform_data/serial_pl01x.h>
>>  #include <linux/compiler.h>
>>  #include "serial_pl01x_internal.h"
>> +#include <fdtdec.h>
>> +
>> +DECLARE_GLOBAL_DATA_PTR;
>>
>>  #ifndef CONFIG_DM_SERIAL
>>
>> @@ -28,7 +31,6 @@ static enum pl01x_type pl01x_type __attribute__ ((section(".data")));
>>  static struct pl01x_regs *base_regs __attribute__ ((section(".data")));
>>  #define NUM_PORTS (sizeof(port)/sizeof(port[0]))
>>
>> -DECLARE_GLOBAL_DATA_PTR;
>>  #endif
>>
>>  static int pl01x_putc(struct pl01x_regs *regs, char c)
>> @@ -351,9 +353,46 @@ static const struct dm_serial_ops pl01x_serial_ops = {
>>         .setbrg = pl01x_serial_setbrg,
>>  };
>>
>> +#ifdef CONFIG_OF_CONTROL
>> +static const struct udevice_id pl01x_serial_id[] ={
>> +       {.compatible = "arm,pl011"},
>> +       {.compatible = "arm,pl010"},
> You can use:
>
>       {.compatible = "arm,pl011", .data = TYPE_PL011},

Thanks for the suggestion.

>> +       {}
>> +};
>> +
>> +static int pl01x_serial_ofdata_to_platdata(struct udevice *dev)
>> +{
>> +       struct pl01x_serial_platdata *plat = dev_get_platdata(dev);
>> +       fdt_addr_t addr;
>> +       const char* type_pl01x;
>> +
>> +       addr = fdtdec_get_addr(gd->fdt_blob, dev->of_offset, "reg");
>> +       if (addr == FDT_ADDR_T_NONE)
>> +               return -EINVAL;
>> +
>> +       plat->base = addr;
>> +       plat->clock = fdtdec_get_int(gd->fdt_blob, dev->of_offset, "clock", 1);
>> +       type_pl01x = fdt_getprop(gd->fdt_blob, dev->of_offset, \
>> +                       "compatible", NULL);
> plat->type = dev_get_driver_data(dev);

completely agree, it would make the code much cleaner.

>> +       if(!strcmp(type_pl01x, "arm,pl011"))
>> +               plat->type = TYPE_PL011;
>> +       else if(!strcmp(type_pl01x, "arm,pl010"))
>> +               plat->type = TYPE_PL010;
>> +       else
>> +               return -EINVAL;
> Should be able to drop this line.

yes, all the above block.

>> +
>> +       return 0;
>> +}
>> +#endif
>> +
>>  U_BOOT_DRIVER(serial_pl01x) = {
>>         .name   = "serial_pl01x",
>>         .id     = UCLASS_SERIAL,
>> +#ifdef CONFIG_OF_CONTROL
>> +       .of_match = pl01x_serial_id,
>> +       .ofdata_to_platdata = pl01x_serial_ofdata_to_platdata,
>> +       .platdata_auto_alloc_size = sizeof(struct pl01x_serial_platdata),
>> +#endif
> Would be good to get rid of the #ifdef.
>
> I think you can put the last one outside the #ifdef, since
> device_bind() will do the right thing if there is already platform
> data.

ok.

>
> For the first one you can do   .of_match = of_match_ptr(pl01x_serial_id),

ok, i will check it.

Rgds,
Vikas

>
> But the middle line (ofdata_to_platdata) does need an #ifdef I think.
> Perhaps we could create something similar to of_match_ptr() for this
> case?
>
>>         .probe = pl01x_serial_probe,
>>         .ops    = &pl01x_serial_ops,
>>         .flags = DM_FLAG_PRE_RELOC,
>> --
>> 1.7.9.5
>>
> Regards,
> Simon