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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190823_084252_617008_98AE8F37 X-CRM114-Status: GOOD ( 18.15 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" , Daniel Thompson , Tony Luck , Manivannan Sadhasivam , Kees Cook , Rob Herring , Anton Vorontsov , Russell King , "linux-kernel@vger.kernel.org" , Colin Cross , Frank Rowand , Linux ARM Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 8/23/19 4:19 AM, Linus Walleij wrote: > On Tue, Aug 20, 2019 at 4:58 PM Dinh Nguyen wrote: > >> @@ -401,6 +402,26 @@ static int amba_device_try_add(struct amba_device *dev, struct resource *parent) >> ret = amba_get_enable_pclk(dev); >> if (ret == 0) { >> u32 pid, cid; >> + int count; >> + struct reset_control *rstc; >> + >> + /* >> + * Find reset control(s) of the amba bus and de-assert them. >> + */ >> + count = reset_control_get_count(&dev->dev); >> + while (count > 0) { >> + rstc = of_reset_control_get_shared_by_index(dev->dev.of_node, count - 1); >> + if (IS_ERR(rstc)) { >> + if (PTR_ERR(rstc) == -EPROBE_DEFER) >> + ret = -EPROBE_DEFER; >> + else >> + dev_err(&dev->dev, "Can't get amba reset!\n"); >> + break; >> + } >> + reset_control_deassert(rstc); >> + reset_control_put(rstc); >> + count--; >> + } > > I'm not normally a footprint person, but the looks of the stubs in > makes me suspicious whether this will have zero impact > in size on platforms without reset controllers. > > Can you just ls -al on the kernel without CONFIG_RESET_CONTROLLER > before and after this patch and ascertain that it has zero footprint effect? Thanks for the review. I checked it, and indeed, it does have a zero footprint effect. > > If it doesn't I'd sure like to break this into its own function and > stick a if (!IS_ENABLED(CONFIG_RESET_CONTROLLER)) return 0; > in there to make sure the compiler drops it. > > Also it'd be nice to get Philipp's ACK on the semantics, though they > look correct to me. > Dinh _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel