-----Original Message----- From: Bin Meng bmeng.cn@gmail.com Sent: Thursday, February 18, 2021 9:28 PM To: Simon Glass sjg@chromium.org; Alexander Graf agraf@csgraf.de; Priyanka Jain priyanka.jain@nxp.com Cc: U-Boot Mailing List u-boot@lists.denx.de; Tom Rini trini@konsulko.com Subject: [PATCH v2 03/38] common: fdt_support: Support special case of PCI address in fdt_read_prop()
At present fdt_read_prop() can only handle 1 or 2 cells. It is called by fdt_read_range() which may be used to read PCI address from <ranges> for a PCI bus node where the number of PCI address cell is 3. The <ranges> property is an array of:
{ <child address> <parent address> <size in child address space> }
When trying to read <child address> from a PCI bus node using fdt_read_prop(), as the codes below:
/* Read <child address> */ if (child_addr) { r = fdt_read_prop(ranges, ranges_len, cell, child_addr, acells); if (r) return r; }
it will fail, because the PCI child address is made up of 3 cells but fdt_read_prop() cannot handle it. We advance the cell offset by 1 so that the <child address> can be correctly read.
This adds the special handling of such case.
Signed-off-by: Bin Meng bmeng.cn@gmail.com
Reviewed-by: Priyanka Jain priyanka.jain@nxp.com