linux-kernel - Re: [PATCH v2 1/7] misc: ddr: add LPDDR2 data from JESD209-2

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Date:	Fri, 16 Mar 2012 14:33:17 -0700
From:	Greg KH <greg@...ah.com>
To:	Aneesh V <aneesh@...com>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-omap@...r.kernel.org
Subject: Re: [PATCH v2 1/7] misc: ddr: add LPDDR2 data from JESD209-2

On Sat, Mar 17, 2012 at 02:28:47AM +0530, Aneesh V wrote:
> Hi Greg,
> 
> On Friday 16 March 2012 12:32 AM, Greg KH wrote:
> >On Thu, Mar 15, 2012 at 11:47:31PM +0530, Aneesh V wrote:
> >>add LPDDR2 data from the JEDEC spec JESD209-2. The data
> >>includes:
> >>
> >>1. Addressing information for LPDDR2 memories of different
> >>    densities and types(S2/S4)
> >>2. AC timing data.
> >>
> >>This data will useful for memory controller device drivers
> >
> >Right now, only one driver, right?
> >
> >>+#ifndef __ASSEMBLY__
> >
> >Why is this needed?
> >
> >>+/* Structure for DDR addressing info from the JEDEC spec */
> >>+struct lpddr2_addressing {
> >>+	u32 num_banks;
> >>+	u32 tREFI_ns;
> >>+	u32 tRFCab_ps;
> >>+};
> >
> >Do these structures cross the user/kernel boundry somehow?  If so,
> >please use the proper kernel types for this.
> >
> >>--- a/lib/Makefile
> >>+++ b/lib/Makefile
> >>@@ -123,6 +123,9 @@ obj-$(CONFIG_SIGNATURE) += digsig.o
> >>
> >>  obj-$(CONFIG_CLZ_TAB) += clz_tab.o
> >>
> >>+obj-$(CONFIG_DDR) += jedec_ddr_data.o
> >>+
> >>+
> >
> >Why the extra line?
> >
> >>  hostprogs-y	:= gen_crc32table
> >>  clean-files	:= crc32table.h
> >>
> >>diff --git a/lib/jedec_ddr_data.c b/lib/jedec_ddr_data.c
> >>new file mode 100644
> >>index 0000000..fc223d6
> >>--- /dev/null
> >>+++ b/lib/jedec_ddr_data.c
> >>@@ -0,0 +1,135 @@
> >>+/*
> >>+ * DDR addressing details and AC timing parameters from JEDEC specs
> >>+ *
> >>+ * Copyright (C) 2012 Texas Instruments, Inc.
> >>+ *
> >>+ * Aneesh V<aneesh@...com>
> >>+ *
> >>+ * This program is free software; you can redistribute it and/or modify
> >>+ * it under the terms of the GNU General Public License version 2 as
> >>+ * published by the Free Software Foundation.
> >>+ */
> >>+
> >>+#include<misc/jedec_ddr.h>
> >>+#include<linux/module.h>
> >>+
> >>+/* LPDDR2 addressing details from JESD209-2 section 2.4 */
> >>+const struct lpddr2_addressing
> >>+	lpddr2_jedec_addressing_table[NUM_DDR_ADDR_TABLE_ENTRIES] = {
> >>+	{B4, T_REFI_15_6, T_RFC_90}, /* 64M */
> >>+	{B4, T_REFI_15_6, T_RFC_90}, /* 128M */
> >>+	{B4, T_REFI_7_8,  T_RFC_90}, /* 256M */
> >>+	{B4, T_REFI_7_8,  T_RFC_90}, /* 512M */
> >>+	{B8, T_REFI_7_8, T_RFC_130}, /* 1GS4 */
> >>+	{B8, T_REFI_3_9, T_RFC_130}, /* 2GS4 */
> >>+	{B8, T_REFI_3_9, T_RFC_130}, /* 4G */
> >>+	{B8, T_REFI_3_9, T_RFC_210}, /* 8G */
> >>+	{B4, T_REFI_7_8, T_RFC_130}, /* 1GS2 */
> >>+	{B4, T_REFI_3_9, T_RFC_130}, /* 2GS2 */
> >>+};
> >>+EXPORT_SYMBOL(lpddr2_jedec_addressing_table);
> >
> >EXPORT_SYMBOL_GPL for these and the others?
> 
> I have fixed these comments and pushed my latest patches at:
> git://github.com/aneeshv/linux.git
> branch: emif-upstream-v4

Sorry, but I don't take git pulls for stuff like this, please send all
of the patches in email so it can be reviewed properly.

thanks,

greg k-h
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