From mboxrd@z Thu Jan 1 00:00:00 1970 From: zajec5@gmail.com (=?UTF-8?B?UmFmYcWCIE1pxYJlY2tp?=) Date: Mon, 9 May 2011 16:33:43 +0200 Subject: [PATCH][WAS:bcmai, axi] bcma: add Broadcom specific AMBA bus driver In-Reply-To: <201105081759.03032.arnd@arndb.de> References: <1304632783-8781-1-git-send-email-zajec5@gmail.com> <201105081647.22091.arnd@arndb.de> <201105081759.03032.arnd@arndb.de> Message-ID: To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 2011/5/8 Arnd Bergmann : > On Sunday 08 May 2011 16:59:55 Rafa? Mi?ecki wrote: >> 2011/5/8 Arnd Bergmann : >> >> >> diff --git a/drivers/bcma/TODO b/drivers/bcma/TODO >> >> >> new file mode 100644 >> >> >> index 0000000..45eadc9 >> >> >> --- /dev/null >> >> >> +++ b/drivers/bcma/TODO >> >> >> @@ -0,0 +1,3 @@ >> >> >> +- Interrupts >> >> >> +- Defines for PCI core driver >> >> >> +- Convert bcma_bus->cores into linked list >> >> > >> >> > The last item doesn't make sense to me. Since you are using the regular >> >> > driver model, you can simply iterate over all child devices of any >> >> > dev. >> >> >> >> It's about optimization. Right now bcma_bus->cores is static array, we >> >> probably never will use all entries. >> > >> > Oh, I see. You should probably have neither of them. Instead allocate >> > the devices dynamically as you find them and do a device_register, >> > which will add the device into linked list. >> >> As I said, and wrote: TODO. > > Well, I think getting this part right is essential before the > patch can get merged. > >> > Maybe you didn't understand what I said: This should be >> > >> > struct bcma_device { >> > ? ? struct bcma_bus *bus; >> > ? ? struct bcma_device_id id; >> > ? ? struct device dev; >> > ? ? u8 core_index; >> > >> > ? ? u32 addr; >> > ? ? u32 wrap; >> > >> > ? ? void *drvdata; >> > }; >> > >> > Here, bcma_device is the device, no need to follow pointers >> > around. It's how all bus_types work, you should just do the same. >> >> We can not use static "struct device", see Greg's comments in: >> [RFC][PATCH V3] axi: add AXI bus driver >> (not to mention we would have unused "struct device" in ChipCommon's >> and PCI's "struct bcma_device"). > > Please reread what Greg explained, it's actually the same as what > I said here: Don't make the device static (you already don't), > don't put the device structure as a member in the bus structure > (as discussed above). Make the device a member of bcma_device, > so you get proper reference counting for it, in the way that > Greg explained. Thanks for help & explaining! Unfortunately Greg didn't answer if my changed implementation is fine. I'll fix this! -- Rafa?