From mboxrd@z Thu Jan 1 00:00:00 1970 From: monstr@monstr.eu (Michal Simek) Date: Wed, 12 Mar 2014 12:51:28 +0100 Subject: [PATCH 3/7] ARM: zynq: Hang iomapped slcr address on device_node In-Reply-To: References: Message-ID: <53204A40.4090805@monstr.eu> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On 03/11/2014 10:26 PM, Olof Johansson wrote: > On Mon, Jan 6, 2014 at 6:36 AM, Michal Simek wrote: >> From: Steffen Trumtrar >> >> For later usage by zynq clk driver. >> >> Signed-off-by: Steffen Trumtrar >> Signed-off-by: Michal Simek >> --- >> arch/arm/mach-zynq/slcr.c | 2 ++ >> 1 file changed, 2 insertions(+) >> >> diff --git a/arch/arm/mach-zynq/slcr.c b/arch/arm/mach-zynq/slcr.c >> index 9746de7..2891dcf 100644 >> --- a/arch/arm/mach-zynq/slcr.c >> +++ b/arch/arm/mach-zynq/slcr.c >> @@ -121,6 +121,8 @@ int __init zynq_early_slcr_init(void) >> BUG(); >> } >> >> + np->data = (__force void *)zynq_slcr_base; > > > This is quite unusual, we normally remap again if needed. Is there a > reason you can't just have the driver request the resource and map it > like most other ones do? I took this patch from Steffen because remapping slcr again in clock driver is another mapping for the same IP. Use one ioremap region seems to me better if there is a way. Of course if this is strictly prohibited we can do another mapping in clock driver. Here is the RFC I have sent after my discussion with Arnd that we should use early syscon initialization and regmap. This is just RFC to show slcr cleaning up. http://permalink.gmane.org/gmane.linux.kernel/1651213 (Here is broken CLK part because clk subsystem uses clk_readl/clk_writel - changing this is discussed in other threads) >>From v1 - regmap device separation was applied by Mark git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap.git tags/nodev >>From v2 - "mfd: syscon: Support early initialization" I expected to get any comment from Arnd but I will respin this based on Lee's comments To summarize this for future I would like to use access with regmap with one ioremap. Thanks, Michal -- Michal Simek, Ing. (M.Eng), OpenPGP -> KeyID: FE3D1F91 w: www.monstr.eu p: +42-0-721842854 Maintainer of Linux kernel - Microblaze cpu - http://www.monstr.eu/fdt/ Maintainer of Linux kernel - Xilinx Zynq ARM architecture Microblaze U-BOOT custodian and responsible for u-boot arm zynq platform -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 263 bytes Desc: OpenPGP digital signature URL: