On Mon, Jul 11, 2011 at 1:05 PM, Haojian Zhuang <haojian.zhu...@marvell.com> wrote: > On Sat, 2011-07-09 at 21:02 -0700, Grant Likely wrote: >> On Fri, Jul 08, 2011 at 06:20:18PM +0800, Haojian Zhuang wrote: >> > Remove builtin gpio driver support form mmp. >> > >> > Signed-off-by: Haojian Zhuang <haojian.zhu...@marvell.com> >> >> Hi Haojian. >> >> I'm not clear what this patch is intending to do. I understand that >> it removes the mmp-specific gpio support, but I looks like don't see the code >> that replaces it, which would mean that applying this patch breaks >> gpio on mmp platforms. >> >> Am I missing something? >> > I'm sorry that I shouldn't loop this patch since my new gpio driver > isn't contained in this patch series. > > I'm willing to add one operation to select using original gpio driver or > the new one. Since the original gpio driver is shared between ARCH-PXA > and ARCH-mmp. I don't want patch breaking the implementation in > ARCH-PXA.
The built-in version is used for those timing critical situations. In some best cases, it can be optimized to only one load/store instruction, which is extremely useful for those bit-banging operations like I2C/SPI emulation with GPIO. > > Thanks > Haojian > > _______________________________________________ devicetree-discuss mailing list devicetree-discuss@lists.ozlabs.org https://lists.ozlabs.org/listinfo/devicetree-discuss
