Instead of setting the compatible property to "cache", append the desired value retaining what may already be set in the current property.
Signed-off-by: Chris Packham <judge.pack...@gmail.com> --- On Thu, Nov 24, 2016 at 6:41 AM, york sun <york....@nxp.com> wrote: > On 11/23/2016 01:43 AM, Chris Packham wrote: >> Hi, >> >> I was just looking at what it would take to add the T2080 L2 cache to >> the mpc85xx_edac driver in Linux. At a cursory glance all the >> registers appear to be there so I figured I'd just add the >> appropriate >> entry to the of match table. >> >> To my surprise I found that the compatible string in my device tree >> was overwritten with "cache". I've tracked this down to the >> CONFIG_SYS_FSL_QORIQ_CHASSIS2 implementation of ft_fixup_l2cache in >> u-boot. >> >> The CONFIG_L2_CACHE version seems to take care to update the device >> tree node to >> >> compatible = "fsl,t2080-l2-cache-controller", "cache"; >> >> but the CONFIG_SYS_FSL_QORIQ_CHASSIS2 version just sets this to >> >> compatible = "cache"; >> >> Is this an over-site or is it intentional? >> > > I don't have any record of this discussion. Kumar wrote and committed > this change. I hope he remembers. > Here's a patch that retains the compatible property from the original dtb and adds the "cache" value if required. This gets the value I need through to the kernel. arch/powerpc/cpu/mpc85xx/fdt.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/cpu/mpc85xx/fdt.c b/arch/powerpc/cpu/mpc85xx/fdt.c index 047c972ac78e..f31df41836d5 100644 --- a/arch/powerpc/cpu/mpc85xx/fdt.c +++ b/arch/powerpc/cpu/mpc85xx/fdt.c @@ -337,7 +337,8 @@ static inline void ft_fixup_l2cache(void *blob) fdt_setprop_cell(blob, l2_off, "cache-size", size); fdt_setprop_cell(blob, l2_off, "cache-sets", num_sets); fdt_setprop_cell(blob, l2_off, "cache-level", 2); - fdt_setprop(blob, l2_off, "compatible", "cache", 6); + if (fdt_node_check_compatible(blob, l2_off, "cache") == 1) + fdt_appendprop_string(blob, l2_off, "compatible", "cache"); } if (l3_off < 0) { -- 2.10.2 _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot